A A A/B-IP A/D AA A AB A AL AAL 1 AAL 2 AAL 3 AAL 4 AAL 5 A AR AARP AAV A BI A BM A BR A BS AC
Amp, Ampere Automatic A/ A/B Ro Roaming-Intelligent Re Retry Analog-To Digital Administrative Authority, Automatic Answer Automatic Alternative Billing ATM Adaptation Layer ATM Adaptation Layer 1 ATM Adaptation Layer 2 ATM Adaptation Layer 3 ATM Adaptation Layer 4 ATM Adaptation Layer 5 Automatic Alternate Routing Apple Ta Talk Address Resolution Pr Protocol Alternate Access Vendors Application Binary Interface Asynchronous Balanced Mode Available Bit Rate (ATM) Alternate Billing Services, Average Busy Stream Access Conditions, Alternating Current, Authentication Center, Alarm Code, Access Control AP Access Point ACA Auto Automa mate ted d Cab Cable le Analy Analysi siss ACC Automatic Automatic Congestion Congestion Contro Control, l, Allianc Alliancee for Competitive Competitive Communicati Communications ons ACD Automa Automatic tic Call Distri Distribut bution/ ion/Dis Distri tributi bution on System System A CE Adaptive Communication Environment ACE ACELP Algeb gebraic aic Co Code-Ex -Excit cited Li Linea near Prediction ACF Access Access Cont Control rol Fiel Field, d, Advance Advanced d Commun Communica icati tion on Functi Function on ACIS Automatic Automatic Customer/C Customer/Caller aller Identifica Identification tion Service Service ACL Appl Applic icat atio ion n Conn Connect ectiv ivit ity y Link Link ACM Address Address Complete Complete Message Message (SS7) (SS7),, Advanced Advanced Communicat Communication ion Function Function ACMA Automatic Cu Customer Name an and Ad Address A CO Alarm Cut-Off A CP Access Communication Processor, Action Control Point, Adjacent Channel Power, A CR Automatic Cell Rate A CS Automatic Call Sequence ACSE Association Control Service Entity/Element A CT Advanced/Applied Computerized Telephony ACT ACTA America's Ca Carriers Te Telecomm ommuni unicat cation As Associ ociation ACTLU Activate Logical Unit ACTPU Activate Physical Unit ACT ACTS Advan vanced Com Communi unications Tec Techno hnology ogy Sa Satellite/S e/Serv ervices
A CU Automatic Calling Unit AD Analog to Digital Converter, ADC ADC ADC Analog-to-Dig Digital Conver version, American Dig Digital Cellula ular ADCC ADCCP P Adva Advanc nced ed Data Data Comm Commun unic icat atio ions ns Cont Contro roll Proce rocedu dure res/ s/Pr Prot otoc ocol ol ADD Architectural Design Document ADM Adaptive Delta Mo Modulation, Ad Add-Drop Multiplexers ADP ADPCM Adap Adapttive Dif Differ ferent ential Pul Pulse Code Code Modul odulat atiion ADSI Analog Display Service Interface ADSL Asymmetric Digital Subscriber Line/Loop) ADSP AppleTalk Data Stream Protocol ADS ADSU ATM DS DSU, As Asynchr chronou nous Tr Transmission Mode Se Service Un Unit ADTS Advanced Digital Terminal System ADX Automatic Data Exchange AE Application Entity AEL Audio Engineering Laboratory AEP AppleTalk Echo Protocol AERM Alignment Error Rate Monitor AES Application En Environment Sp Specification AFC Automa Automatic tic Freque Frequency ncy Contro Control, l, Applica Applicati tion on Foundat Foundation ion Classe Classess AFR AFR Annu Annual al Failu ailurre Rat Ratee AFT AFT Aut Automat omatiic Fine Fine Tun Tuniing AGC AGC Auto Automa mati ticc Gain Gain Cont Contro roll AGCH Access Grant Grant Channel AGP AGP Acce Accele lera rate ted d Grap Graphi hics cs Port Port AH Alar Alarm m Han Handl dler er,, Aut Authen henti tica cati tion on Heade Header, r, Amp Amp Hour Hour AIA AIA Aero Aerosp spac acee Indu Indust stry ry Asso Associ ciat atio ion n AIC AIC Adap Adapta tati tion on and and Integ Integra rati tion on Cent Center er AID AID Appl Appliicat cation ion Ident dentiifier fier AIN AIN Adva Advanc nced ed Int Intel elli lige gent nt Net Netwo work rk AIOD Automatic Automatic Identifi Identification cation of Outward Outward Dialing Dialing AIP AIP ATM ATM Inter nterfa face ce Proces ocesssor AIR AIR Allo Allowe wed d Inf Inform ormati ation Rat Ratee AIRS AIRS Alarm Alarm Identif Identifica icatio tion n Reporting Reporting System System AIS AIS Alar Alarm m Indi Indica cati tion on Sign Signal al AITS AITS Acknowl Acknowledge edged d Informat Information ion Transf Transfer er Servic Servicee AIW AIW APPN APPN Impl Implem ement enter er's 's Work Worksh shop op AIX AIX Adva Advanc nced ed Int Inter erac acti tive ve Exec Execut utiv ivee ALC ALC Auto Automa mati ticc Leve Levell Con Contr trol ol ALEC Alternate Alternate Local Local Exchange Exchange Carrie Carrier r ALI ALI Auto Automa mati ticc Locat Locatio ion n Ident Identif ific icat atio ion n ALMAAlcatel Management Applications ALPETH Aluminum/Polyethylene ALSC Automatic Automatic Level Level and and Slope Slope Control Control ALU ALU Arit Arithm hmet etic ic Logi Logicc Uni Unitt AM Ampli Amplitud tudee Modul Modulati ation, on, Admi Adminis nistra tratio tion n Modul Module, e, Acti Active ve Moni Monitor tor AMA Automa Automatic tic Messag Messagee Accoun Accountin ting g
A CU Automatic Calling Unit AD Analog to Digital Converter, ADC ADC ADC Analog-to-Dig Digital Conver version, American Dig Digital Cellula ular ADCC ADCCP P Adva Advanc nced ed Data Data Comm Commun unic icat atio ions ns Cont Contro roll Proce rocedu dure res/ s/Pr Prot otoc ocol ol ADD Architectural Design Document ADM Adaptive Delta Mo Modulation, Ad Add-Drop Multiplexers ADP ADPCM Adap Adapttive Dif Differ ferent ential Pul Pulse Code Code Modul odulat atiion ADSI Analog Display Service Interface ADSL Asymmetric Digital Subscriber Line/Loop) ADSP AppleTalk Data Stream Protocol ADS ADSU ATM DS DSU, As Asynchr chronou nous Tr Transmission Mode Se Service Un Unit ADTS Advanced Digital Terminal System ADX Automatic Data Exchange AE Application Entity AEL Audio Engineering Laboratory AEP AppleTalk Echo Protocol AERM Alignment Error Rate Monitor AES Application En Environment Sp Specification AFC Automa Automatic tic Freque Frequency ncy Contro Control, l, Applica Applicati tion on Foundat Foundation ion Classe Classess AFR AFR Annu Annual al Failu ailurre Rat Ratee AFT AFT Aut Automat omatiic Fine Fine Tun Tuniing AGC AGC Auto Automa mati ticc Gain Gain Cont Contro roll AGCH Access Grant Grant Channel AGP AGP Acce Accele lera rate ted d Grap Graphi hics cs Port Port AH Alar Alarm m Han Handl dler er,, Aut Authen henti tica cati tion on Heade Header, r, Amp Amp Hour Hour AIA AIA Aero Aerosp spac acee Indu Indust stry ry Asso Associ ciat atio ion n AIC AIC Adap Adapta tati tion on and and Integ Integra rati tion on Cent Center er AID AID Appl Appliicat cation ion Ident dentiifier fier AIN AIN Adva Advanc nced ed Int Intel elli lige gent nt Net Netwo work rk AIOD Automatic Automatic Identifi Identification cation of Outward Outward Dialing Dialing AIP AIP ATM ATM Inter nterfa face ce Proces ocesssor AIR AIR Allo Allowe wed d Inf Inform ormati ation Rat Ratee AIRS AIRS Alarm Alarm Identif Identifica icatio tion n Reporting Reporting System System AIS AIS Alar Alarm m Indi Indica cati tion on Sign Signal al AITS AITS Acknowl Acknowledge edged d Informat Information ion Transf Transfer er Servic Servicee AIW AIW APPN APPN Impl Implem ement enter er's 's Work Worksh shop op AIX AIX Adva Advanc nced ed Int Inter erac acti tive ve Exec Execut utiv ivee ALC ALC Auto Automa mati ticc Leve Levell Con Contr trol ol ALEC Alternate Alternate Local Local Exchange Exchange Carrie Carrier r ALI ALI Auto Automa mati ticc Locat Locatio ion n Ident Identif ific icat atio ion n ALMAAlcatel Management Applications ALPETH Aluminum/Polyethylene ALSC Automatic Automatic Level Level and and Slope Slope Control Control ALU ALU Arit Arithm hmet etic ic Logi Logicc Uni Unitt AM Ampli Amplitud tudee Modul Modulati ation, on, Admi Adminis nistra tratio tion n Modul Module, e, Acti Active ve Moni Monitor tor AMA Automa Automatic tic Messag Messagee Accoun Accountin ting g
AMI AMI Alte Altern rnat atee Mark Mark Inv Inver ersi sion on AMIC Americas Americas Integra Integration tion Center AML AML Ampl Amplit itud udee Modul Modulat ated ed Link Link AMP Active Active Monitor Monitor Presen Present, t, Adminis Administrati trative ve Module Module Processor Processor,, Ampere Ampere AMPS Advanced Advanced Mobile Phone Phone System System AMS AMS Alar Alarm m Man Manage ageme ment nt Sys Syste tem m AMSC American Mobile Satellite Corporation Corporation AMTAAmerican Mobile Telecommunications Association AN Acce Access ss Net Network work,, Acce Accesss Node Node ANI Auto Automa mati ticc Numb Number er Iden Identi tifi ficat catio ion n ANM Autonomous Autonomous Networ Network k Manager, Manager, Amerit Ameritech ech Network Network Managem Management ent ANR Auto Automa mati ticc Netw Networ ork k Rout Routin ing g ANS ANS Amer Americ ican an Natio Nationa nall Stand Standar ard d ANSI American American National National Standards Standards Institute Institute AOM Applic Applicati ation on OSI OSI Managem Management ent AOS AOS Alte Altern rnat ativ ivee Oper Operat ator or Ser Servi vice cess AOSP Alternative Alternative Operator Operator Service Servicess Provider Provider AP Appl Appliicat cation ion Pro Progr gram am,, Acc Acces esss Poi Point nt APCG ATM Pilot Pilot Coordinat Coordination ion Group APCO Association of Public-Safety Public-Safety Communications Officials APD APD Aval Avalan anch chee Pho Photo to Diod Diodee APDU Applicatio Application n Protocol Data Data Unit API API Appl Applic icat atio ion n Progr Program ammi ming ng Inte Interf rfac acee APL APL Anal Analog og Priva rivate te Line ine APON ATM Passive Passive Optical Optical Network Network APP APP Appl Applic icat atio ions ns Por Porta tabi bili lity ty Prof Profil ilee APPC Advanced Advanced Program-toProgram-to-Progr Program am Communicati Communication on APPN Advanced Advanced Peer-toPeer-to-Peer Peer Network Networking ing APS APS Auto Automa mati ticc Prot Protec ecti tion on Swit Switch chin ing g APT APT Tele Teleph phony ony Appl Applic icat atio ions ns Syst System em APZ APZ Tele Teleph phon ony y Con Contr trol ol Syst System em AQL AQL Aver Averag agee Que Queue ue Leng Length th ARAP AppleTalk AppleTalk Remote Remote Access Protocol Protocol ARB Adapti Adaptive ve Rate-B Rate-Base ased d Conge Congesti stion on Control Control ARCnet Attached Re Resource Co Computer Ne Network ARE ARE All All Rou Routtes Expl Explor orer er ARF Appl Applic icat atio ion n Regi Regist stra rati tion on File File ARM Applicatio Application n Response Response Measurem Measurement, ent, Asynchr Asynchronous onous Response Response Mode Mode ARP Addr Addres esss Reso Resolu luti tion on Prot Protoc ocol ol ARPA Advanced Advanced Research Research Projects Projects Agency Agency ARPAN ARPANET ET Advan Advance ced d Rese Resear arch ch Pro Proje ject ctss Agen Agency cy Net Netwo work rk ARPU Average Average Revenue Revenue Per Per User User ARQ Auto Automa mati ticc Repe Repeat at Reque Request st ARRL American American Radio Radio Relay League ARS ARS Acti Action on Requ Reques estt Syst System em ARU ARU Audi Audio o Res Respo pons nsee Uni Unitt
AS
Associated Signaling, Authentication Server, Application System, Autonomous System ASC Available Spare Capacity, AIN Switch Capabilities ASCII American Standard Code for Information Interchange ASCU Agent Set Control Unit ASDS ACCUNET Spectrum of Digital Services ASE Application Service Element ASI Alternate Space Inversion ASIC Application Specific Integrated Circuit ASK Amplitude Shift Keying ASN Abstract Syntax Notation ASP Advanced Speech Processor, AppleTalk Session Protocol ASPI Advanced SCSI Programming Interface ASR Automatic Speech Recognition, Automatic Set Relocation, Access Service Request AST Acceptance and System Test AT Automatic Tandem, Advanced Technology AT&T American Telephone and Telegraph ATA AT Attachment ATC ATM Transfer Capability ATCS Advanced Timed Channel Selection ATDMAsynchronous Time Division Multiplexing ATEL Advanced Television Evaluation Laboratory ATG Advanced Technology Groups ATIS Alliance for Telecommunications Industry Solutions ATM Asynchronous Transfer Mode ATM DSU Asynchronous Transmission Mode Digital Service Unit ATM DXI ATM Data Exchange Interface ATMF ATM Forum ATMS Assumption-Based Truth Maintenance System ATP Advanced Technology Program, Acceptance Test Procedure AppleTalk Transaction Protocol ATR Answer-to-reset ATS Acceptance Test Specification ATSC Advanced Television Systems Committee, Australian Telecommunication Standardization Committee ATTC Advanced Television Test Center ATU-C ADSL Transmission Unit - Central Office ATU-R ADSL Transmission Unit - Remote ATV The U.S. Advanced TV System or Advanced TV AU Administration Unit, Access Unit AUC Authentication Center AUI Attachment/Autonomous Unit Interface AURP AppleTalk Update-based Routing Protocol AUSTEL Australian Telecommunications. AUX Apple UNIX
AV AVA AWC AWG AWT
Alarm Viewer Attribute Value Assertion Area-wide Centrex American Wire Gauge Abstract Windowing Toolkit
B B Bridge B/R Bridge/Router b/s Baudacro_b.htm B3ZS Bipolar 3-Zero Substitution B8ZS Binary 8 Zero Substitution B911 Basic 911 emergency service BA Balanced Asynchronous BACP Bandwidth Allocation Control Protocol BAF Bellcore Accounting Format BAIC Barring of All Incoming Calls BAM Bell Atlantic Mobile BAN Boundary Access Node BANCS Bell Administrative Network Communications System BAOC Barring of All Outgoing Calls BAP Bandwidth Allocation Protocol BAS Basic Activity Subset BASICBeginners All-Purpose Symbolic Instruction Code BAsizeBuffer Allocation Size BB Base Band BBNS Broadband Network Service BBS Bulletin Board Service BBTH Broadband to the Home BC Bearer Capability/ Committed Burst BCAP Bandwidth Allocation Control Protocol BCC Block Check Character, Bus Control Card, Block Calls Cleared BCCH Broadcast Control Channel BCD Binary Coded Decimal, Blocked Calls Delayed, Binary Code Decimal BCDIC Binary Coded Decimal Interchange Code BCE Bandwidth-Control Elements BCF Bearer Control Function BCLB Broadband Connectionless Bearer Service BCM Basic Call Model/Bit-Compression Multiplexer BCOB Broadband Connection-Oriented Bearer Service (ATM) BCP Basic Call Process BCR Block Cell Rate BCS Basic Combined Subset, Block Check Sequence
BCTS Backup Courier Time Server BDAT Best Demonstrable Achievable Technology B-DCN Backbone Data Communications Network BDFB Breaker Distribution Fuse Bay BDT Telecommunications Development Bureau Be Excess Burst Size BECN Backward Explicit Congestion Notification BER Basic Encoding Rules, Bit Error Rate BERT Bit Error Rate Test BEtag Beginning-End Tag BF Basic Function BFM Business Function Model BGP Border Gateway Protocol BGP4 Border Gateway Protocol version 4 BHCA Busy Hour Call Attempts BHCC Busy Hour Call Completions BIB Backward Indicator Bit (SS7) BIC Barring of Incoming Calls BICSI Building Industry Consulting Service International B-ICI Broadband Inter-Carrier Interface (ATM) BIDS Barring of Incoming Calls BIOS Basic Input/Output System BIP Bit Interleaved Parity BIS Base Infrastructure B-ISDN Broadband Integrated Services Digital Network BISUP Broadband ISDN User Part BISYNC Binary Synchronous Communications Protocol BIT Binary Digit BITS Building Integrated Timing Supply BIU Basic Information Unit BLA Blocking Acknowledgement B-LE Broadband Local Exchange BLF Busy Lamp Field BLO Blocking BLOP Binary Large Object BLSR Bi-directional Line Switched Ring BLU Basic Link Unit BMAS Business Management System BML Business Management Layer BMP Billing Mediation Platform, BER Management Protocol BMS Billing Mediation System BNC Bayonet Neil Councilman/ British Naval Connector BNF Backus-Naur Form BNN Boundary Network Node BOA Basic Object Adapter BOB Breakout Box
BOC Bell Operating Company BOEOC Bit-Oriented Embedded Operations Channel BOIC Barring of Outgoing International Calls BOM Beginning of Message, Business Object Model BONDING Bandwidth on Demand Interoperability Working Group BONT Broadband Optical Network Termination BOOTP Bootstrap Protocol Boot Prom Boot-Programmable Read-Only Memory BOP Bit Oriented Protocol BOSS Billing and Order Support System BP Burst Period BPAD BISYNC Packet Assembler/Disassembler BPDU Bridge Protocol Data Unit (LAN) BPF Band Pass Filter BPI Bit Per Inch BPM Business Process Model BPR Business Process Re-Engineering BPRZ Bipolar Return to Zero BPS Bits per second BPSK Binary Phase Shift Keying, Bi-Phase Shift Keying BPX Broadband Packet Exchange BRCS Business and Residence Centrex Services BRE Bridge Relay Element BRI Basic Rate Interface BRITEBasic Rate Interface Transmission Equipment BRLU Broadband Remote Line Unit BRPM Business Resource Planning Model BRS Business Recovery Service BS Base Station BSA Basic Service Arrangement BSBH Busy Season Busy Hour BSC Base Station Controller, Binary Synchronous Communications BSD Berkeley Software Distribution BSDB Business Services Data Base BSE Basic Service Element BSIC Base Station Identity Code BSLBF Bit String/Serial - Leftmost Bit First BSN Backward Sequence Number (SS7) BSPs Bell System Practices BSRF Basic System Reference Frequency BSS Basic Synchronized Subset, Broadband Switching System, Base Station System BTA Basic Trading Area BTN Billed Telephone Number BTS Base Transceiver Station BSVCIBroadcast Signaling VCI BT British Telecom, Burst Tolerance
BTA Basic Trading Area B-TA Broadband Terminal Adapter (B-ISDN) BTAMBasic Telecommunications Access Method B-TE Broadband Terminal Equipment (B-ISDN) BTN Billing Telephone Number BTS Base Transceiver Station (Wireless/GSM) BTSM Base Transceiver Station Management BTU Basic Transmission Unit BUS Broadcast Unknown Server
C C A high level programming language C+ A high level programming language C++ a high level programming language C/I Carrier to Interface Ratio C/N Carrier to Noise Ratio C/R Command/Response C/T Carrier-To-Noise-Temperature Ratio CA Certification Authority, Conditional Access CABS Carrier Access Billing System CAC Carrier Access Code, Call Admission Control CAD Computer-Aided Design CAE Computer-Aided Engineering CAF Core ATM Functions CAGR Compound Annual Growth Rate CAI Client Application Interface, Common Air Interface CAM Computer-Aided Manufacturing, Content-Addressable Memory, Common Access Method CAMEL Customized Application for Mobile-Enhanced Logic, Call Management Language CAN Cosmopolitan Area Network, Cable Area Network, Customer Access Network CAP Competitive Access Providers, Common Application Platform, Carrierless Amplitude Phase modulation CAPI Common ISDN API CARS Community Antenna Relay Station/Service CAS Channel Associated Signaling CASE Common Application Service Element CAT Computer-Aided Tomography, Conditional Access Table CAT3 Category 3 Twisted Pair CAT4 Category 4 Twisted Pair CAT5 Category 5 Twisted Pair CAT7 Category 7 Twisted Pair CATIA Computer-Assisted Three-dimensional Interactive Application
CATV Cable Television, Originally Community Antenna Television CAU Controlled Access Unit CAUCP Control Access Unit Control Program CB Channel Bank, Citizens Band CBC Cipher Block Chaining CBDS Connectionless Broadband Data Service CBEMA Computer and Business Equipment Manufacturers Association CBM Client Business Manager CBR Constant Bit Rate CBS Certified Banyan Specialist CBT Computer-Based Training CBX Computerized Branch Exchange CC Cluster Controller, Connect Confirmation, Country Code, Cross Connect CCAF Call Control Agent Function CCB Customer Care and Billing CCBS Customer Care and Billing System, Completion of Call to Busy Subscribers CCC Credit Card Calling, Call Content Channels, Clear-channel Coding, ClearChannel Capability CCCH Common Control Channel CCD Charge Coupled Device CCDA Cisco Certified Design Associate CCDP Cisco-Certified Design Professional CCE Consistency Check End CCF Call Control Function, Custom Calling Feature CCFL Cold-Cathode Fluorescent Lamp CCG Central Clock GeneratorCCFL CCH Connections Per Circuit Hour CCI Command Communicator and Interpreter, Common Client Interface CCIE Cisco-Certified Internetwork Expert CCIR International Radio Consultative Committee CCIS Common Channel Interoffice Signaling CCITTInternational Telegraph and Telephone Consultative Committee CCM Customer Contact Manager CCNA Cisco-Certified Network Associate CCNC Common Channel Signaling Network Control CCNP Cisco-Certified Network Professional CC-NUMA Cache Coherent Non-Uniform Memory Access CCR Consistency Check Request CCRA Consistency Check Request Acknowledgement CCRSE Commitment Concurrency and Recovery Service Element CCS Canadian Communication Service, Common Channel Signaling, Centum Call Second CCS7 Common-Channel Signaling No. 7 CCSN Common Channel Signaling Network CCSS Common Channel Signaling System CCT Controlled Cell Transfer
CCTV Closed-Circuit Television CCV Credit Card Verification CCW Channel Command Words CD Call Disconnect, Cell Delay, Carrier Detect CDC Call Data Channels CDDI Copper Distributed Data Interface CD-E Compact Disc Erasable CDE Common Desktop Environment CDF Cumulative Distribution Function, Channel Definition Format CDG CDMA Development Group CD-I Compact-Disc Interactive CDI Change Direction Indicator CDLC Cellular Data-Link Control CDM Computer District Manager CDMA Code Division Multiple Access CDN Corporate Data Network CDPD Cellular Digital Packet Data CD-R Compact Disc Recordable CD-ROM Compact Disc-Read Only Memory CD-ROM XA CD-ROM Extended Architecture CDR Call Detail Record, Call Data Record CD-ROM Compact Disc-Read Only Memory CD-ROM XA CD-ROM Extended Architecture CD-RW Compact Disc Re-Writeable CDS Cell Directory Service CDSL Customer Premises Digital Subscriber Line CDT Carrier Definition Table, Connection Dropping Threshold CDTV Conventional Definition TV CD-V Compact-Disc Video CDV Cell Delay Variation CDVT Cell Delay Variation Tolerance CE Circuit Emulation, Computing Element CED Called Equipment Identification Tone CEI Comparably Efficient Interconnection CEMHControlled Environment Man Hole CEPT Conference of European Postal and Telecommunications Administrations CER Cell Error Ratio CERN European Council for Nuclear Research CERT Computer Emergency Response Team CES Circuit Emulation Service CEV Controlled Environmental Vault CFA Carrier Failure Alarm CFB Call Forwarding Busy, Cipher Feedback CFMP Cellular Fault Management Package CFN Confusion (B-ISDN) CFNRc Call Forwarding on Mobile Subscriber Not Reachable
CFNRy Call Forwarding on No Reply CFP Cordless Fixed Part CFRS Concert Frame Relay Services CFU Call Forwarding Unconditionally CGA Carrier Group Alarm CGI Common Gateway Interface CGM Computer Graphics Metafile CGSA Contiguous/Cellular Geographical Service Area CH Carrier Hotel CHAP Challenge Handshake Authentication Protocol CHO Choke Packet CI Computer Interconnect, Communications Infrastructure, Clear Indication, Clear Request CIBERCellular Intercarrier Billing Exchange Record CIC Country Indicator Code, Circuit or Carrier Identification Code CICS Customer Information Control System CICS/VS Customer Information Control System/Virtual Storage CIDR Classless Inter-Domain Routing CIF Common Intermediate Format, Cell In Frames CIIII Computer Inquiry III CIL Components Integration Laboratories CIM Computer Integrated Manufacturing CIO Corporate IT Organization, Chief Information Officer CIP Channel Interface Processor, Concert Internet Plus Services, Certified Internet Professional CIR Committed Information Rate CIRC Cross Interleaved Reed-Solomon Code CISC Complex Instruction Set Computer CIT Computer Integrated Telephony CIX Commercial Internet Exchange CJ CM Terminator CK Check Bit CKSN Ciphering Key Sequence Number CL Capabilities Select CLAD Cell Assembly/Disassembly CLAS Centrex Line-Assignment Service CLASS Custom Local Area Switching Service/Signaling System CLDC Competitive Long Distance Coalition CLEC Competitive Local Exchange Carrier CLF Carrier Line Failure CLI Command Line Interface, Calling Line Identification, Cumulative Leakage Index CLID Calling Line Identification CLIP Calling Line ID Parameter, Calling Line Identification Presentation CLIR Calling Line Identification Restriction CLLC Common Language Location identification Code CLLM Consolidated Link Layer Management
CLNAP Connectionless Network Access Protocol CLNP Connectionless Network Protocol CLNS Connectionless Network Service CLP Cell Loss Priority CLR Capabilities List Request, Cell Loss Ratio CLS Connectionless Server CLTD Clock and Tones Distribution CLTS Connectionless-mode Transport Service CM Connection Manager, Channel Management, Call Menu, Communication Management CMAS Cellular Management System CMC Common Mail Call, Common Messaging Call CME Circuit Multiplication Equipment, Communications Management Entity CMI Controlled Mode Idle CMIP Common Management Information Protocol CMIPDU CMIP Data Unit CMIS Common Management Information Service CMISE Common Management Information Service Element/Entity, Cable Microcell Integrator CML Command Manual CMMRD Cellular Microcell/Microsystem Requirements Document CMN Common information CMODES Confidentiality Modes CMOS Complementary Metal Oxide Semiconductor CMOTCMIP Over TCP/IP CMP Communications Module Processor CMRS Commercial Mobile Radio Service CMS Circuit Multiplication System CMSDB Call Management Services Data Base CMT Cellular Messaging Teleservice CMTSD Cellular Mobile Telephone Service Descriptions CMYK Cyan, Magenta, Yellow, Black CN Common Name CAN Certified Novell Administrator CNAD Calling Name Delivery CNAP Calling Name Presentation CNAR Calling Name Restriction CNC Concentrator, Configurable Network Computing CNE Certified Novell Engineer CNG Calling Tone, Comfort Noise Generator CNI Calling Number Identification, Comfort Noise Insertion CNIP Calling Number Identification Presentation CNIR Calling Number Identification Restriction CNM Customer Network Management CNMA Customer Network Management Agent CNP Connection Negotiation Protocol
CNR Carrier-to-Noise Ratio CNR Carrier to Noise Ratio, Channel Number CNRP Common Name Resolution Protocol CNS Complementary Network Service CNSS Core Nodal Switching Subsystems CNX Certified Network Expert CO Central Office Coax Coaxial cable COBOL Common Business Oriented Language COC Central Office Connection CoCOM Coordinating Committee on Export Controls CODEC Coder-Decoder COFA Change of Frame Alignment COFDM Coded Orthogonal Frequency Division Multiplexing COFETEL Comision Federal de Telecomunicaciones de Mexico CoIP Conferencing over IP COLAN Central Office-based LAN CoLP Connected Line Identification Presentation CoLR Connected Line Identification Restriction COM Component Object Model COMCCommunications Controller Companding Compressing/Expanding COMSAT Communications Satellite Corporation CONNEG Content Negotiations CONP Connection-Oriented Network Protocol CONS Connection-Oriented Network Service Conus Contiguous United States COOLAN Central Office-based Local Area Network COP Character Oriented Protocol COPS Common Open Policy Service CORBA Common Object Request Broker Architecture CORD Cibernet On-line Roaming Database COS Corporation for Open Systems, Class of Service COSE Common Open Software Environment COS-OST Corporation for Open Systems Executive Industry Group COSP Customer Owned Outside Plant COSS Common Object Services Specification COT Central Office Terminal CP Coordination Processor, Control Point, Communications Protocol CPA Combined Paging/Access CPAN Customer Premises Area Network CPAP Customer Premises Access Profile CPCS Common Part Convergence Sublayer CPE Customer Premises Equipment CPEV City Pair Polyethylene PVC CPF Compatible Protocol Field
CPG CPI CPI-C CPL CPLC CPM
Call Progress Computer-PBX Interface Common Programming Interface for Communication Call Processing Language, Corporate Price List Custom Product Life Cycle Customer Premises Management, Custom Patch Manager, Continuous Presence Multipoint CPN Calling Party Number, Customer Premise Network CPNI Customer Proprietary Network Information CPO Computer Products Operation CPP Calling Party Pays CPS Cycles Per Second, Customer Premises System CPSII Communications Protocol Stack Independent Interface CPSS Control Packet Switching System CPT Cellular Paging Teleservice, Cooperative Programming Tool, Cross Platform Toolset CPU Central Processing Unit CQ CAS Signal, Communication Quality CQPSK Compatible Differential Offset Quadrature Phase Shift Keying CR Connect Request, Capabilities Request, Call Reference, Carriage Return CRADA Cooperative Research and Development Agreement CRC Cyclic Redundancy Check, Country Response Center, Cyclic Redundancy Checkword CRFP Cordless Radio Fixed Parts CRM Customer Relationship Management CRP Command Repeat CRS Configuration Report Server, Call Relay Service CRT Cathode-Ray Tube CRTC Canadian Radio & Television Commission CRTS Cellular Radio Telecommunications Service CRUD Create Read Update Delete CRV Call Reference Value CS Connection Segment, Circuit Switch, Convergence Sublayer, Client/Server, Canadian Standard CS-1 Capability Set 1 CSA Carrier Serving Area, Customer Service Adviser, Customer Service Associate, Called Subscriber Address, Canadian Standards Association CSAA California State Automobile Association CS-ACELP Conjugate Structure ACELP CSC Common Signaling Channel CSCW Computer Supported Cooperative Work CSD Coordinated Standards Document, Computer Services Delivery CSDC Circuit Switched Capability CSDN Circuit Switched Data Network CSD-P Circuit Switched Data, Point-to-Point Service CSE Cooperative Software Engineering
CSI
Color Status Indicator, Clearing Subnetwork Identification, Construction Specification Institute CSLIP Compressed Serial Link Internet Protocol CSM Communications System Monitoring CSMA Carrier Sense Multiple Access CSMA/CA Carrier Sense Multiple Access with Collision Avoidance CSMA/CD Carrier Sense Multiple Access/Collision Detection CSN Circuit-Switched Network CSNET Computer Science Network CSNMS Carrier Service Network Management Systems CSNP Complete Sequence Number Packet CSO Computer Systems Operation/Organization, Curvature of the Second Order CSPDN Circuit Switched Public Data Network CS-PDU Convergence Sublayer - Protocol Data Unit CSPG Cellular Service Provider Group CSPP Computer System Policy Project CSR Communications Standards Review, Customer Service Representative CSS Communications Standards Summary, Composite Source Signal, Convolutional Spectral Shaping, Cascading Style Sheets, Customer Service System CSTA Computer Supported Telecommunication Applications CSU Channel Service Unit, Customer Service Unit CSV Circuit Switched Voice CT Computerized Tomography, Call Trace, Channel Termination CT2 Cordless Telephone 2, Second Generation Cordless Telephones CTB Composite Triple Beat CTC Cell Transfer Capacity CTD Cambridge Technology Group, Cell Transfer Delay CTE Connected Telecommunications/Terminal Equipment CTI Computer Telephony Integration CTIA Cellular Telecommunications Industry Association CTM Cordless Terminal Mobility CTN Corporate Telecommunication Networks CTO Chief Technical Officer CTP Common Transport Protocol CTR Common Technical Requirements, Common Technical Regulation CTS Clear To Send, Courier Time Server CTX Centrex CU Channel Unit, Composite User, Control Unit CUA Common User Access CUG Closed User Group CUKEY Closed User KEY CUL Client Unit Leader CuT Codec Under Test CV Code/Coding Violation CVNS Concert Virtual Network Service CVPN Concert Virtual Private Networks
CVSD Continuous Variable Slope Detection, Continuously Variable Slope Delta Modulation CW Continuous Wave, Call Waiting CWA Communications Workers of America CWC Center Weight Control CWD Call Waiting Deluxe CWP Cost Work Program CYL Complex Stutter Dial Report
D D/A Digital to Analog D/I Drop & Insert D/TT Digital Tie Trunk D3 Third Generation Channel Bank D4 Fourth Generation Channel Bank DA Destination/Device Address, Directory Assistance DAA Data Access Arrangement DAC Dual Attachment Concentrator, Digital to Analog Converter DACS Digital Access & Cross Connect System DAL Direct/Digital/Dedicated Access Line DAM Diagnostic Acceptability Measurement DAMA Demand-Assigned Multiple Access D-AMPS Digital AMPS, Digital Advanced Mobile Phone Service DAP Data/Directory/Document Access Protocol DARPA Defense Advanced Research Projects Agency DAS Dual Attachment Station, Distributed Antenna System DASD Direct Access Storage Device, "Dazzdee" DAT Digital Audio Tape DATU Direct-Access Test Unit DAU Data Adapter Unit DAVIC Digital Audio-Visual Council db Decibel DBA Dynamic Bandwidth Allocation D-Bank Channel Bank dBm dB Relative To One Milliwatt, dB Relative To Noise DBM Dual Bitmap DBMS Database Management System dBmV Decibels Referenced to 1 Millivolt DBN Dial-Back Number DBS Direct Broadcast Satellite dBuV Decibels Referenced To 1 Microvolt DC Direct Current, Directionality Classification
DCA Digital Communications Associates, Document Content Architecture, Dynamic Capacity Allocation DCB Digital Channel Bank DCC Digital Control Channel, Data Communications Channel, Data Country Code DCCH Digital Control Channel DCD Data Carrier Detect DCE Data Circuit-Terminating Equipment, Data Communications Equipment, Digital Cellular Equipment DCER Data Circuit-Terminating Equipment Ready DCF Disengage Confirmation, Distributed Coordination Function, Data Count Field D-Channel Data Channel DCM Digital Circuit Multiplication DCMEDigital Circuit Multiplication Equipment DCMS Digital Circuit Multiplication Systems DCN Disconnect, Data Communications Network DCOR Draft technical Corrigendum DCP Digital Communications Protocol, Digital Connectivity Probing DCR Degradation Category Rating DCS Digital Cellular System, Digital Command Signal, Digital Cross-connect System, Digital Communications System DCS-1800 Digital Cordless Standard DCT Data Calling Tone, Discrete Cosine Transform DCT-U Digital Cordless Telephone - U.S. DCV Digital Compressed Video DD Database Description, Domain Directory DDCMP Digital Data Communications Message Protocol (DNA) DDD Direct Distance Dialing DDF Digital Distribution Frame DDI Direct Dialing In DDM Digital Data Multiplexer, Distributed Data Manager DDN Defense Data Network DDP Datagram Delivery Protocol DDR Dial-on-Demand Routing, Document Discrepancy Report DDS Dataphone Digital Service, Digital Data Service DDSD Delay Dial Start Dial DE Discard Eligibility, Data Element, Designated Entity De-BPSK Differential Binary Phase Shift Keying DEC Digital Extended Command DECmcc DEC Management Control Center DECT Digital European Cordless Telephone, Digital Enhanced Cordless Telecommunications Demarc Demarcation Point DEN Directory Enabled Networks DEO Digital End Office De-QPSK Differential Quadrature Phase Shift Keying DER Digital Extended Request
Des Designation Strip (slang "Dez") DES Data Encryption Standard, Digital Extend Signal, DF Data Compression Format, Deblocking Filter, Distributing Frame, Dedicated File DFB Distributed Feedback DFC Data Flow Control DFD Displaced Frame Difference DFE Decision Feedback Equalizer DFI Domain Specific Part Format Identifier DFL Distributed Feedback Laser DFP Distributed Functional Plane DFRI Datacom Reference Frame Input DFS Distributed File System DFT Distributed Function Terminal DG Drafting Group DHCP Dynamic Host Configuration Protocol (TCP/IP) DHE Document Handling Equipment DI Digital Interface DIA Document Interchange/Interface Architecture DIC Delay Interval Compensation DID Direct Inward Dialing DIL Digital Impairment Learning DILL Dynamic Link Library DILIC Dual Inline Integrated Circuit DIMM Dual Inline Memory Module DIMRS Digital Integrated Mobile Radio System DIN Deutsche Industrie Norm DIP Dual Inline Pin/Package DIS Digital Identification Signal, Draft International Standard DISA Direct Inward System Access/Defense Information Systems Agency DISC Disconnect Disco Disconnect DISXML Extended Markup Language DIX Digital, Intel, and Xerox DJGPPMSDOS Port of GCC DKTS Digital Key Telephone Station DL Data Link DLC Digital Loop Carrier, Dynamic Load Control, Data Link Control/Connection DLCI Data Link Connection Identifier DLE Data Link Escape DLH Data Link Layer Header DLL Dynamic Link Library DLM Distributed Lock Manager DLP Data Protocol DLSw Data Link Switching DLT Data Link Layer Trailer DLU Digital Line Unit
DLUR Dependent Logical Unit Register DLUS Dependent Logical Unit Server DM Disconnected Mode, Delta Modulation DMA Direct Memory Access DMAC Direct Memory Access Control DMB Dynamic Multipoint Bridging DME Distributed Management Environment DMH Data Message Handler DMI Desktop Management Interface, Digital Multiplex Interface DMIF DSM-CC Multimedia Integration Framework DMOSDegradation MOS DMP Downlink Measurement Protocol DMPB Digital Multipoint Bridging DMS Digital Multiplex Switch/Systems DMT Discrete Multi-tone Carrier DMTF Desktop Management Task Force DMV Differential Motion Vector DN Directory Number (SS7) DNA Digital Network Architecture DND Do Not Disturb DNI Digital Negotiation Information Signal DNIC Data Network Identification Code, Data Network Interface DNIS Dialed Number Identification Service DNK Digital Not Acknowledge DNS Domain Name Systems, Domain Name Server DNU Digital Networking Unit DoC Declaration of Conformity, Department of Commerce, Department of Communications (Canada) DOCSIS Data Over Cable Service Interface Specification DOD Direct Outward Dialing DOS Disk Operating System DOV Data Over Voice DP Data Privacy, Dial Pulse DPA Data Privacy Algorithm, Document Printing Application, Distributed Power Architecture DPBX Digital PBX, Digital Private Branch Exchange DPC Destination Point Code (SS7) DPCM Digital PCM, Differential Pulse Code Modulation DPI Dots Per Inch DPN Data Packet Network DPNSS Digital Private Network Signaling System DPO Dial Pulse Originate DPS Dynamic Power Save DPSK Differential Phase Shift Keying DPT Dial Pulse Terminate, Distribution-Preserving Tomlinson DQDB Distributed Queue Dual Bus
DQUANT Field for Modified Quantization Mode DR Dynamic Range, Discrepancy Report DRA Dynamic Rate Adaptation DRAD Digital Remote Antenna Driver DRAM Dynamic Random Access Memory, Digital Recorded Announcement Machine DRDA Distributed Relational Database Architecture (IBM) DRQ Disengage Request DRR Dynamic Rate Repartitioning DRT Diagnostic Rhyme Test DRUMS Detailed Revision/Update of Message DS Digital Signal/Service, Directory Synchronization DS0 Digital Service Level Zero DS1 1.544 Mbit/s T1 Interface, (DS0 x 24 mux = 24 DS0) DS2 (DS1 x 4 mux = 96 DS0) DS3 44.736 Mbit/s T3 Interface, (DS2 x 7 mux = 672 DS0) DSA Digital Signature Algorithm (NIST) DSA Directory System Agent/Authentication DSAA DECT Standard Authentication Algorithm DSAP Destination Service Access Point, Data Services Access Profile DSAT Digital Supervisory Audio Tone DSB-SC Double sideband-suppressed carrier DSC DECT Standard Cipher DSE Data Switching Equipment/Exchange DSG Data Systems Group DSI Digital Speech Interpolation DSL Digital Subscriber Line/Loop, Document Selection DSLAM Digital Subscriber Line-Access Multiplexer DSM Demand Side Management, Digital Storage Media DSMADigital Sense Multiple Access DSMCC Digital System Multimedia Communication Control DSM-CC Digital Storage Media - Command and Control DSN Delivery Status Notification, Disposition Service Notification DSO Digital service level 0 DSP Digital Signal Processing, Directory System Protocol, Domain System Protocol, Domain Specific Part DSPU Downstream Physical Unit DSR Data Set Ready, Dynamic Symbol Reordering DSREQ Data Service Request DSS Digital Subscriber Signaling System, Digital Signature Standard, Digital Switched Services, Digital Satellite System, Direct Station Selection DSS1 Digital Subscriber Signaling 1 DSSS Direct Sequence Spread Spectrum DSU Data Service Unit, Digital Service Unit, DSVD Digital Simultaneous Voice and Data DSX Digital System/Service Cross-Connect
DT Dual Tone DTA Digital Terminal & Access Project DTAAB DECT Technical Advisory Ad hoc Board DTAMDocument Transfer Access Method DTAP Direct Transfer Application Part DTAU Digital Test Access Unit DTC Digital Traffic Channel, Digital Transmit Command, Digital Transmitting Code DTD Document Type Definition DTE Data Terminal/Terminating Equipment DTF Dial Tone First, Digital Transmission Facility DTG Digital TV Group DTI Digital Trunk Interface DTIF Disabilities Issues Task Force DTLU Digital Terminal Line Unit DTM Dynamic Synchronous Transfer Mode DTMF Dual Tone Multi-frequency DTR Data Terminal Ready, DTE Ready, Draft Technical Report DTS Definitive Telefax Standard, Digital Terminal Systems, Draft Technical Standard, Digital Transmission Systems DTU Data Terminal Unit DTX Discontinuous Transmission DUA Directory User Agent DUAL Distributed Update Algorithm DUN Dial-Up Networking DUP Dedicated User Port (Frame Relay) DV Digital Video DVB Digital Video Broadcasting DVCC Digital Verification Color Code DVD Digital Video Disk, Digital Versatile Disk DVD2 Digital Versatile Disk, 2nd Generation DVD-ROM Digital Video Disk Read-Only Memory DVD-RW Digital Video Disc ReWriteable DVMRP Distance Vector Multicast Routing Protocol DVEMDifferential Vector Error Magnitude DVI Digital Video Interleaved DVM Data over Voice Multiplexer DVMRP Distance Vector Multicast Routing Protocol DVT Digital Video Terminal DWDM Dense Wavelength Division Multiplexing DWS Dial-able Wideband Service DX Duplex DXI Data Exchange Interface
E E&M E/O E-911 EA
Ear & Mouth: Separate signaling lines Electrical-to-Optical Enhanced 911 Address Field Extension (HDLC), Extensible Agent, European Accreditation, Extended Addressing EAC EIR Administration Center EADAS Engineering and Administration Data Acquisition System EAI Enterprise Application Integration EAS Emergency Alert System EBCDIC Extended Binary Coded Decimal Interchange Code EBPP Electronic Billing Payment & Presentment EBS Emergency Broadcast System EC Echo Canceller, Echo Control, Error Control, European Commission, Exchange Carriers, Electronic Commerce, European Community, Event Correlator ECB Electronic Code Book ECC Embedded Communications Channel, Error Correction Circuitry ECDL Event Correlation Definition Language ECE Echo Cancellation Equipment ECH Enhanced Call Handeling ECIS European Committee for Interoperable Systems ECM Error Correction Mode ECMA European Communications Manufacturers Association, European Computer Manufacturers Association ECN Explicit Congestion Notification EC-n Electrical Carrier ECP Enhanced Call Processing, Extended Capabilities Port ECS Event Correlation Services ECSA Exchange Carriers Standards Association ECSD Enhancement of High Speed Circuit Switched Data ECSP Electronic Communications Service Provider ECSQ Entropy Constrained Scalar Quantization ECT Explicit Call Transfer ECTEL European Telecommunications & Professional Electronics Industry ECTF Enhanced Communication & Transport Service, Enterprise Computer Telephony Forum ECTRA European Commission (Council) of Telecommunications Regulatory Authorities ECVQ Entropy Constrained Vector Quantization ED Ending Delimiter EDA Electronic Design Automation EDACS Enhanced Digital Access Communications System EDC Electronic Document Coordinator
EDD Electronic Document Distribution EDGE Enhanced Data Rates for GSM Evolution EDH Electronic Document Handling EDI Electronic Data Interchange, End System Identifier EDIBANX EDI Bank Alliance Network Exchange EDIF Electronic Design Information Format EDM Enterprise Desktop Management EDP Electronic Data Processing EDO DRAM Extended Data-Output Dynamic Random-Access Memory EDSS1European Digital Subscriber System #1 EDSX Electronic Digital System Cross-connect EDT European Deaf Telephone EDTV Enhanced Definition Television EE Equipment Engineering EEC European Economic Community EEMAC Electrical & Electronic Manufacturers Association of Canada EENS European Enterprise Network Strategies EEO Extremely Elliptical Orbit EEP Equal Error Protection EEPROM Electrically Erasable Programmable Read-Only Memory EERP Extended Enterprise Resource Planning EES Escrow Encryption Standard EF Enhanced Functions, Event Filter, EFCI Explicit Forward Congestion Indicator (ATM) EFD Event Forward Discriminator EFF Electronic Frontiers Foundation EF&I Engineer Furnish and Install EFI Expedited Flow Indicator EFM Eight-Fourteen Modulation EFR Enhanced Full Rate EFRC Enhanced Full Rate Codec EFS End of Frame Sequence (LAN) EFT Electrical Fast Transient EFTA European Free Trade Association/Area EG ETSI Guide, Expert Group EG AN ETSI Guide Access Network EGDIR Expert Group Directory System EGMHS Expert Group Message Handling System EGP Exterior/External Gateway Protocol EGPRS Enhanced General Packet Radio System EGSM Extended GSM EH Event Handler EHF Extremely High Frequency EHP Electron-Hole Pairs EHS European Home Standards EHSA Enhanced High System Availability
EI Enhancement Intra, Error Indicator, Expansion Interface EIA Electronics Industry Association EIA Standards Electronic Industries Association Standards EIC Equipment Installer's Code, European Integration Center EICASEngine Indicating & Condition Advisory System EICD External Interface Control Document EID Equipment Identifier, Error Insertion Device EIDE Enhanced Integrated Drive Electronics EIFAXExtended Internet Fax EIGRPEnhanced Interior Gateway Routing Protocol EII European Information Infrastructure EIP Ethernet Interface Processor EIR Equipment Identity Register, Excess Information Rate EIRP Equivalent Isotropic Radiated Power, Effective Isotropic Radiated Power EISA Extended Industry-Standard Architecture EL Event Logger, Element Layer El/Az Elevation & Azimuth ELA Event Log Agent ELAN Emulated Local Area Network ELAP EtherTalk Link Access Protocol (AppleTalk) ELAWG EMC Laboratories Accreditation Working Group ELC Education Life Cycle ELF Extremely Low Frequency ELFEXT Equal Level Far End Crosstalk E Link Extended Link EM Electromagnetic, Element Management/Manager, Expert Modifier, Event Manager, Enterprise Messaging EMA Electronic Messaging Association EMBARC Electronic Mail Broadcast to a Roaming Computer EMC Electromagnetic Compatibility, Equipment Manufacturer's Code EMCS Electromagnetic Compatibility Society EME Electromagnetic Emissions EMF Electromagnetic Fields/Electromotive Force EMG Extension Module Group EMI Electromagnetic Interference, Exchange Message Interface EML Element Management Layer EMLS Event Message Logging System EMM Entitlement management message EMML Extended MML EMO Electronic Mail Operation EMS Element Management System, Emergency Services, Event Management Service, Expanded Memory Specification EMT Electrical Metal Tubing, European Management Team EN Egress Node, End Node, European Norm Enet Abbreviation for Ethernet Enhanced IGRP Enhanced Interior Gateway Routing Protocol
ENIAC Electronic Numerical Integrator and Calculator ENM EWSD Network Management ENM/OS ENM/Operating System ENP Extended Negotiation Procedure ENQ Enquiry ENS Enterprise Network Services/Strategies ENSS Exterior Nodal Switching Subsystem ENTELEC Energy Telecommunications & Electrical Association ENUMTelephone Numbering Mapping EO End Office EOB End of Bus/Block EOC Embedded Operations Channel, Edge of Coverage EOCC European OSS Competence Circle EOD End of Dialing EOI End of Image EOL End of Line, End of Life EOM End of Message (DQDB, SMDS) EOR/ERR End of Retransmission/ Response for End of Retransmission EOS Electronic Output Strategies, End of Selection, End of Sequence EOSBS End of Sub-Bitstream EOS-PPS End of Selection for selective polling applications EOT End of Transmission EP Enhancement Predicted, Error Pattern, ETSI Project, Extended Protocol EPA Environmental Protection Agency EP-CNETSI Project Corporate Network EP-DTA ETSI Project Digital Terminal Access EP-EASI ETSI Project-European ATM Services Interoperability EPG Electronic program guide EPHOS European Procurement Handbook for Open Systems EPIIC European Program on Information Infrastructure Committee EPIISG European Project on Information Infrastructure Starter Group EPL Echo Path Loss EPP ETSI Partnership Projects/Enhanced Parallel Port EPPA European Public Paging Association EPROM Erasable Programmable Read Only Memory EPS Enterprise Parallel Server EPSCSEnhanced Private Switch Controlled System EPT Echo Protect Time EQ Equalization, Equalizer EQN Extended Queuing Network EQTV Extended Quality Television ER Egress Router ERB Editorial Review Board ERC European Radio Committee/Communications EREC Error Resilient Entropy Code/Error Robust Entropy Code ERL Echo Return Loss
ERM ETSI Commit Committee tee on EMC EMC & Radio Radio Spectrum Spectrum Matters, Matters, Explic Explicit it Rate Market Marketing ing ERMES European Radio Messaging ERO ERO Euro Europea pean n Radio Radio Commun Communic icat atio ions ns Offi Office ce ERP Effect Effective ive Radiat Radiated ed Powe Power, r, EOC Regist Register er Prot Protoco ocoll ERS ERS Exte Extern rnal al Refe Refere renc ncee Spe Speci cifi fica cati tion on ES Emer Emerge genc ncy y Serv Servic ices es,, Erro Errorr Seco Second nds, s, Escap Escapee Sequ Sequen ence ce,, Esca Escape pe Sign Signal al,, ETSI ETSI Standard, Express Swapping, End System ES/MSEscape Signal/Mode Select ESA ESA Emer Emerge genc ncy y Stan Standd-Al Alon onee ESC ESC Engi Engine neer erin ing g Servi Service ce Circ Circui uits ts ESCON Enterprise Sy System Co Connection (I (IBM) ESD Echo Echo Suppr Suppress essor or Devi Devices ces,, Elect ElectroS roStat tatic ic Disch Discharg argee ESDI ESDI Enhanc Enhanced ed Smal Smalll Devic Devicee Inter Interfac facee ESF ESF Exte Extend nded ed Sup Super erfr fram amee Form Format at (T(T-1) 1) ESFDL Extended Super Frame Data-Link ESG Enhanc Enhanced ed Servi Service ce Gatew Gateway, ay, Enterp Enterpris risee Server Server Group Group ESI ESI Emer Emerge genc ncy y Serv Serviices ces Int Interf erface ace ESIG ESIG Europea European n SMDS SMDS Intere Interest st Group Group ESIOP Environment Specific Specific Interoperability Interoperability Protocol Protocol ES-IS ES-IS End System-I System-Interm ntermediat ediatee System System ESM Enterpris Enterprisee System System Management, Management, Enterpris Enterprisee Soluti Solutions ons Model ESMR Enhanced Enhanced Specialized Specialized Mobile Mobile Radio E-SMR Enhance nced/Extende nded Sp Specialized zed Mob Mobiile Ra Radio ESMTP Extende nded Simple Mail Transf nsfer Protocol ESN ESN Equi Equipm pmen ent/ t/El Elect ectro roni nicc Seria Seriall Numbe Number r ESNX Expanded Expanded Electronic Electronic Serial Serial Number ESO ESO Ente Enterp rpri rise se Sol Solut utio ion n Orga Organi niza zati tion on ESP Enhanc Enhanced ed Servi Service ce Prov Provide ider, r, Enca Encapsu psulat lating ing Secu Securit rity y Payl Payload oad ESPM Extended Extended System System Parameters Parameters Message Message ESS Enhanc Enhanced ed Signal Signaling ing Syst Systems ems,, Elect Electroni ronicc Switc Switchin hing g Syste System m ESTL ESTL Evol Evolvi ving ng STL STL ET Emerging Tec Technologies ETB ETB End End of of Tex Textt Blo Block ck (BIS (BISYN YNC) C) ETC Exchan Exchange ge Termina Terminall Circuit, Circuit, Exempt Exempt Telecom Telecommuni municati cations ons Compan Company, y, Enhanced Enhanced Throughput Cellular ETD Electr Electrica icall Time Time divisi division on Demult Demultipl iplexer exer ETDM Electrical Time Division Multiplexing Multiplexing E-TD E-TDMA MA Ext Extende ended d Ti Time Divi Divisi sion on Mul Multipl iple Acc Acces esss ETIS ETIS Europea European n Teleco Telecommu mmunica nicati tions ons Informa Informati tics cs Services Services ETL ETL Euro Europe pean an Tes Testi ting ng Lab Labor orat ator ory y ETM Electr Electrica icall Time Time divi divisio sion n Multi Multiple plexer xer ETN ETN Elec Electr tron onic ic Tan Tande dem m Netw Networ ork k ETNO European European Telecommuni Telecommunication cationss Network Network Organizatio Organization n ETNS European European Telephon Telephony y Numberi Numbering ng Space Space ETO ETO Euro Europea pean n Telec Telecomm ommuni unicat catio ions ns Offi Office ce ETR Early Early Token Token Rele Release ase,, ETSI ETSI Techni Technical cal Report Reportss
ETS European European Telecommuni Telecommunication cations/Tec s/Technical hnical Standard, Standard, Experimental Experimental Test Satellite Satellite ETSI ETSI Europea European n Teleco Telecommu mmunica nicati tions ons Standar Standards ds Instit Institute ute ETU ETU Elem Elemen enta tarry Ti Time Uni Unitt ETX End of Text EU European Un Union EU MRA MRA Euro Europe pean an Unio Union n Mutu Mutual al Reco Recogn gnit itio ion n Agr Agree eeme ment ntss Eunet Eunet Euro Europea pean n UNIX UNIX Netwo Network rk EURESCOM European Institute for Research & Strategic Studies in Telecommunications EURO EUROBI BIT T Eur Europea opean n Asso Associ ciat atiion of Manu Manuffactu acturrers ers of Bus Busines inesss Machi achine ness & Information Technology EUT EUT Equi Equipm pmen entt Und Under er Test Test EUTELSAT EUTELSAT European European Telecommuni Telecommunication cationss Satellit Satellitee Organizati Organization on EVE EVE Euro Europea pean n Vid Videop eopho hone ne Expe Experi rime ment nt EVM EVM Erro Errorr Vec Vecto torr Magn Magnit itude ude EVRC Enhanced Enhanced Variable Variable Rate Rate Codec Codec EVUA European European VPN Users Association Association EWOS European Workshop for Open Systems EWS EWS Engi Engine neer er Wor Work k Stat Statio ion n EZW EZW Embe Embedde dded d Zero Zero-t -tre reee Wave Wavele lett
F f Frequency F/D F/D Rati Ratio o of Anten Antenna na Foc Focal al Leng Length th to to Ante Antenn nnaa Diam Diamet eter er f/s Frames Per Second FA Flexible Al Alerting FAA FAA Feder Federal al Avia Aviati tion on Admi Admini nist stra rati tion on FAC FAC Final nal Ass Assem embl bly y Cod Codee FACCH Fast Associated Control Channel FACS FACS Faci Facili liti ties es FACTR Fujitsu Ac Access and Tr Transport System FAMO FAMOUS US Futu Future re Adva Advanc nced ed Mobi Mobile le Univ Univer ersa sall Sys Syste tem m FAP Fuse Alarm Panel FAQ FAQ Freq Freque uent ntly ly Aske Asked d Ques Questi tions ons FAR FAR Feder Federal al Avia Aviati tion on Regu Regula lati tions ons FAS Facili Facility ty Associ Associate ated d Signalin Signaling, g, Frame Frame Alignmen Alignmentt Signal/ Signal/Seq Sequenc uencee FAT FAT File Al Allocat ocatiion Tab Tablle FAT16File Allocation Table Version 16 FAT32File Allocation Table Version 32 FB Framing Bit FBC Feedba dback Co Control FBI FBI Fede Federa rall Bur Burea eau u of of Inv Inves esti tiga gati tion on FBM FBM FEXT EXT Bi Bit Map Map Mode ode
FC Frame Control, Feature Code ode FCA FCA Fixe Fixed d Chan Channe nell All Alloc ocat atio ion n FCA FCAPS Faul ault Con Conffigur gurati ation Acco Accoun untting ing Per Perfforma ormanc ncee Sec Secur uriity FCC Federa Federall Communi Communicat cation ionss Commiss Commission ion,, Forward Forward Contr Control ol Channel Channel FCCH Frequency Frequency Correction Correction Channel Channel FCD FCD Fast Fast Tra Track ck Com Commi mitt ttee ee Dra Draft ft FCF Facsim Facsimil ilee Contr Control ol Field, Field, Forwar Forward d Cont Control rol Field Field FCI FCI Fiber ber Chan Channe nell Int Interf erface ace FCIF FCIF Full Full Comm Common on Interm Intermedi ediate ate Format Format FCOT Fiber Central Central Office Office Terminal Terminal FC-PH Fiber Channel Physical & Signaling Interface FCS Frame Frame Check Check Seque Sequence nce,, Federa Federatio tion n of Commu Communic nicati ations ons Serv Service icess FD SCS SCSII-2 2 Fast Fast/D /Dif iffe fere rent ntia iall impl implem ement entat atio ion n of SCSI SCSI-2 -2 FDA FDA Food Food & Drug Drug Admi Admini nist stra rati tion on FDAMFinal Draft Amendment FDCT Forward Forward Discrete Discrete Cosine Cosine Transformat Transformation ion FDD FDD Freq Freque uenc ncy y Divi Divisi sion on Dupl Duplex ex FDDI FDDI Fiber Fiber Distr Distribu ibuted ted Data Data Interfa Interface ce FDI FDI Feed Feeder er Dist Distri ribu buti tion on Inte Interf rfac acee FDIS FDIS Final Final Draf Draftt Inter Internat nation ional al Stand Standard ard FDL FDL Facil aciliities ties Data Data Link ink FDM Frequency Frequency Division Division Multi Multiplexi plexing, ng, File File Diagnost Diagnostic ic Message Messagess FDMAFrequency Division Multiple Access FDN FDN Full Fully y Dist Distin ingu guis ishe hed d Name Name FDR FDR Freq Freque uenc ncy y Dom Domai ain n Refl Reflec ecto tome metr try y FD-SCS FD-SCSI-2 I-2 Fast/D Fast/Diff iffere erenti ntial al Implem Implement entati ation on of SCSI-2 SCSI-2 FDX Full-Duplex FE Faci Facili liti ties es Exch Exchang ange, e, Func Functi tiona onall Ent Entit itie ies, s, Faul Faultt Eve Event nt FEA Front End Agent FEAC FEAC Far End End Alarm Alarm & Cont Control rol FEAL FEAL Fast Fast Encrypti Encryption on Algorith Algorithm m FEBE FEBE Far End End Block Block Erro Errorr (SONE (SONET) T) FEC Forward Forward Error Error Correction, Correction, Forward Forward Error Error Control, Control, Frame Erasure Erasure Conceal Concealment ment FECN Forward Forward Explicit Explicit Congestion Congestion Notific Notification ation FEFA FEFA Far Far End End Fail Failur uree FEIP FEIP Fast Fast Ethern Ethernet et Interf Interface ace Proces Processor sor FELB FELB Far Far End End Loop Loop Bac Back k FEP FEP Front ront-E -End nd Proce rocess ssor or FER Frame Error Rate ate FERF FERF Far End End Receiv Receivee Failur Failuree (SONET (SONET)) FET FET Field eld Effe Effect ct Tr Transi ansist stor or FEXT FEXT Far End Cross Cross Talk Talk FFDI FFDI Fast Fast Fib Fiber er Data Data Int Inter erfa face ce FFM FFM Firs Firstt Fai Failu lure re to Matc Match h FFS For Fu Further St Study FFT FFT Fast ast Fou Fouri rier er Tran Transsform form
FG Frame Ground FGD Feature Group D FH Frame Handler FHSS Frequency Hopping Spread Spectrum FHWAFederal Highway Administration FI Format Identifier FIB Forward Indicator Bit (SS7) FID Format Identification FIF File Interchange Format FIFO First In First Out FIP FDDI Interface Processor FIPS Federal Information Processing Standards FIR Finite Impulse Response FIRP Federal Internetworking Requirements Panel FITC Fiber to the curb FITH Fiber to the House FITL Fiber In The Loop FL Facilities List FLL Fixed Loss Loop FLMTS Future Land Mobile Telephony Systems FLS Fault Logging System FM Frequency Modulation, Fault Management, Function Management FMAC Facility Maintenance and Administration Center FMAS Facility Management System FMC Funnel Management Client FMH Function Management Header FML Frequency Modulated Link FMO Frequency Modulated Oscillator, Future Mode of Operation FMP Fault Management Platform, Formatted Message Processor FMP-1 FMP Single Server Solution FMP-4 FMP Multiple Server Solution FMS FM Solution, Flight Management Systems FMT Filtered Multi-tone FN Frame Number FNA Functional Network Architecture FNC Federal Networking Council FNE Fixed Network Equipment FNV Field Not Valid, Frame Not Valid FO Fiber Optic FOC Fiber Optic Connector FOD Fax on Demand FOI Field Of Interest FOIRLFiber Optic Inter-Repeater Link FOM Figure of Merit FOREG Forced Registration Flag FORTRAN Formula Translation
FOSE Fiber Optic Splice Enclosure FOT Forward Transfer, Flow Object Transfer, Fiber Optic Terminal FOTAG Fiber Optic TAG FOTP Fiber Optic Test Procedure FOTS Fiber Optic Transmission System FP Filter Program, Fixed Part FPDL Foreign Data Processor Link FPH Free Phone FPLMN Foreign Public Land Mobile Network FPLMTS Future Public Land Mobile Telephone/Telecommunications Systems FPM Field Project Management Fps frames per second, Framing Pattern Sequence FPS Frame Rate FQPCID Fully Qualified Procedure Correlation Identifier FR Frame Relay FR PVC Frame Relay Permanent Virtual Connection FRAD Frame Relay Access Device FRBS Frame Relay Bearer Service FRC Full Rate Codec FRF Frame Relay Forum, Field Registration File FRMR Frame Reject (HDLC) FRP Fragmentation Protocol FRS Frame Relay Service FRSU Fixed Radio Subscriber Units Fs Signal Framing Bits (T-1) FS Fixed Satellite, Frame Size, Functional Specification, Filter Set, File Services, Frame Status FSAN Full Service Access Networks FSB For Small Business FSIP Fast Serial Interface Processor FSK Frequency Shift Keying FSL File System Layout FSM Field Strength Meter FSM Finite State Machine FSN Forward Sequence Number (SS7) FSS Fixed Satellite Service Ft Terminal Framing Bits (T-1) FT Fault Ticket, Fault Tolerant, Fixed Radio Terminal FT-1 Fractional T-1 FTAA Free Trade Area of the Americas FTAM File Transfer, Access and Management FTBP File Transfer Body Part FTC Federal Trade Commission FTH Class 1 Command HDLC transmit FTMI France Telecom Mobiles Internationale FTP File Transfer Protocol
FTT Failure To Train FTTB Fiber To The Building FTTC Fiber to the Curb FTTCab Fiber To The Cabinet FTTExFiber To The Exchange FTTH Fiber to the Home FUNI Frame User-to-Network Interface FVC Forward Voice Channel FWA Fixed Wireless Access FWI Flash With Info FWUF Federal Wireless Users Forum FX Foreign Exchange FXO Foreign Exchange Office FXS Foreign Exchange Subscriber
G G Giga GA General Assembly GAP Generic Access Profile/Protocol GASP Gatekeeper Synchronization Protocol GAT Generic Application Template GATT General Agreement on Trade & Tariffs Gb Gigabit Gb/s Gigabit Per Second GBSC Group of Blocks Start Code GBSVC General Broadcast Signaling Virtual Channel GC Global Crossing GCC Generic Conference Control GCF Generic Command Facility GCRA Generic Cell Rate Algorithm GDMO Guidelines for the Definition of Managed Objects GDR Global Desired Receive GDS Global Directory Service GDSC GSM DECT Site Controller GDSS Group Decision Support Systems GE General Electric GEA Gigabit Ethernet Alliance GECOS General Electric Comprehensive Operating System GEMS Generic Element Management Solution GEO Geosynchronous/Geostationary Earth Orbit GEOS Geosynchronous Earth Orbit Satellites GF Generic Functional Procedures GFC Generic Flow Control (ATM)
GFCI Ground Fault Circuit Interrupt GFI General Format Identifier GFID GOB Frame Identification GFLOPS Giga Floating point Operations per Second GFRC Glass Fiber Reinforced Concrete GGT Global Governance Team GHz Gigahertz GI Graded index, Gains Information GIBN Global Interoperability of Broadband Networks GIDS Global IP Directory Service, Global IP Telephony Database Service GIF Graphics Interchange Program GII Global Information Infrastructure/Initiative GIO Generic Interface for Operations (SMDS) GIOP General Inter-ORB Protocol GIP Global Internet Project GIS Geographic Information System GISN Global IP-Telephony Subscriber Number GIT Generic Identifier Transport GK Gatekeeper GLASS Globally Accessible Services GLP Geographic Location Profile GLR Global Location Register GMDSS Global Maritime Distress & Safety System GMII Gigabit Media Independent Interface GMM Global Multimedia Mobility GMSC Gateway MSC GMT GDMO Modeling Toolkit, Greenwich Mean Time GN GOB Number GNATT Generic Enhanced Teleservice Transport GNE Gateway Network Element GNIM Generic Network Information Model GNS Global Network Service GOB Group of Blocks GOD Global Operations Directorate GOF Glass Optical Fiber GOS Grade Of Service GOSIPGovernment Open Systems Interconnection Profile GOSS Guide to Open Systems Specification GPDS General Packet Data Service GPM General Page Message GPRS General Packet Radio Service/System GPS Global Positioning Satellite/System GPSy Global Product and Pricing System GRIN Graded-Index Fiber GRJ Gatekeeper Reject GRP Good Regulatory Practices
GRQ Gatekeeper Discovery Request GS Ground Start GSA General Services Administration GSC GOB Start Code GSDN Global Software Defined Network GSM Global System for Mobile Communications GSO Geostationary Satellite Orbit GSS Group Switching Subsystem GSTN General Switched Telephone Network GT Global Title GTA Global Title Address GTAAB GSM Technical Advisory Ad hoc Board GTAI Global Title Address Information GTE General Telephone and Electronics GTP General Telemetry Processor GTS Global Time Server GTT Global Title Translation GUI Graphical User Interface GUP Gatekeeper Update Protocol GVPN Global VPN GW Gateway GWC Gateway Controller GWL Gateway Links GWLOC Gateway Location Protocol
H HA High Availability HAL Hardware Abstraction Layer HAN Home ATM Network HATISHearing Aid Telephone Interconnect System HC Horizontal Cross-Connect, Header Counter HCDS High Capacity Digital Services HCM High Capacity Multiplexing HCS Header Check Sequence HCSPR Hundred Call Seconds Per Hour HCV High Capacity Voice HDB Home Data Base HDB3 High Density, Bipolar 3 HDD Hard Disk Drive HDLC High-level Data Link Control HD-MM CD High Density Multimedia CD HDSL High-Rate Digital Subscriber Line HDT Host Digital Terminal
HDTMHalf-Duplex Transmission Module HDTTS 50 High Density Thumb Screw, 50 pin HDTTS 68 High Density Thumb Screw, 68 pin HDTV High Definition Television HDX Half-Duplex HE Header Extension, High End HEC Header Error Control HECO Head-End Control Unit HEL Header Extension Length HEMP High Energy Electromagnetic Pulses HEMS High Level Entity Management System HEO Highly Elliptical Orbit HES Home Electronic System Hex Hexadecimal HF High Frequency, Human Factor HFC Hybrid Fiber/Coax HFCI The H.323 Firewall Control Interface HFR Hybrid Fiber Radio HFS Hierarchical File Storage/System HFT Hands Free Telephone HFX Hawthorne Facsimile Cipher HIA Hearing Industries Association HIC Head-end Interface Converter HI-FI High Fidelity HILI Higher Layers and Internetworking HIP HSSI Interface Processor HIPERLAN High Performance Radio Local Area Network HIPPI High-Performance Parallel Interface HIVR Host Interactive Voice Response HLC High Layer Compatibility HLD High Level Design HLI High Layer Information HLL High Level Language HLM Heterogeneous LAN Management HLP High Level Parser HLPI Higher Layer Protocol Identifier HLR Home Location Register HLTF High Level Task Force HMA High Memory Area, Human Machine Adaptation H-MLP High Speed Multi Layer Protocol HMMP Hypermedia Management Protocol HMOM Hypermedia Object Manager HMP Host Monitoring Protocol HMW High Molecular Weight HNI Home Network Identity HNOS Home Network Operating System
HNPA Home Numbering Plan Area HNW Home Network HO Hand Off, Hand Over HOB Head of Bus HomePNA Home Phone-line Networking Alliance HOSTID Host Identifier HP/UX HP's Version of UNIX Operating System HPAD Host Packet Assembler/Disassembler HPC High Performance Computing/Computer HPCI Harmonized Programmable Communications Interface HPF High Pass Filter HPFS High Performance File System HPL Home-Phone LAN HPLI Higher Layer Protocol Identifiers HPLMN Home Public Land Mobile Network HPNA Home Phone-line Network Alliance HPR High Performance Routing HPUX Unix in HP Workstations HRC Half Rate Codec HRD Hypothetical Reference Decoder HRTF Head Related Transfer Function HS Harmonized Standards HSC Hierarchical Storage Controller, High Speed Connect HSCD High-speed Cable Data HSCSD High Speed Circuit Switched Data HSD High Speed Data HSLAN High Speed LAN HSM Hierarchical Storage Management, High Speed Modem HSMR Hourly Status Message Report HSN Hopping Sequence Number HSP Host Signal Processing HSPSD High-Speed Packet Switched Data HSSG High Speed Study Group HSSI High-Speed Serial Interface (ANSI) HT Holding Time HTML Hypertext Markup Language HTTP Hypertext Transport/Transfer Protocol HTU HDSL Transmission Unit HTU-C Handshake Transceiver Unit - Central Office End HTU-R Handshake Transceiver Unit - Remote Terminal End HW Hardware Hz Hertz
I I&I Interworking & Interoperability I&M Installation and Maintenance I&R Internet Architecture Board I/G Individual/Group, Implementer's Guide I/O Input/Output IA Implementation Agreement, Interoperability Agreements IA5 International Alphabet #5 IAA IAM Acknowledge IAB Internet Activities/Architecture Board IAC Industry Advisory Committee IACS Integrated Access and Crossconnect System IAD Integrated Access Device IAFIS Integrated Automated Fingerprint Identification System IAHC Internet Ad Hoc Committee IAM Initial Address Message, ISDN Access Module IANA Internet Address Naming/Number Authority IAP Intercept Access Point IAR Instruction Address Register, IAM Reject IAT Integrated Access Terminal, Internet Access Time IB Indicator Bits IBDN Nortel's name for CAT 5 horizontal wiring standard IBS INTELSAT Business Services, Intelligent Building Systems IBT International Business Traveler IC Integrated Circuit, Intermediate Cross-Connect, Integrated Circuit IC Inter-exchange Carrier, Input Controller I-CAN Integrated Customer Access Network ICANN Internet Corporation for Assigned Names & Numbers ICB Individual Case Basis ICC Interstate Commerce Commission, International Coordination Committee, Incremental Coherent Carriers ICCB Internet Control and Configuration Board ICCF Industry Carriers Compatibility Forum, Inter-exchange Carrier Compatibility Forum ICD International Code Designator (ISO) ICE Integrated Capacity Expansion ICEA Insulated Cable Engineers Association ICF Info-Confirm, Information Conversion Function, International Cryptography Framework ICFA International Computer Facsimile Association ICG Intersector Coordination Group ICI Inter-Carrier Interface, Interface Control Information, Inter-exchange Carrier Interface
ICIP Inter-Carrier Interface Protocol ICL Inserted Connection Loss ICMP Internet Control Message Protocol ICN Integrated Community Network ICO Intermediate Circular Orbit ICP Internet Control Protocol, Independent Content Provider IC-POT Interexchange Carrier-Point of Termination ICS Incoming Call Screening, Intuitive Command Structure, Integrated Communication System ICT Information & Communication Technology ICTSB Information & Communication Technology Standards Board ICV Integrity Check Value ICWWG Interagency Cellular & Wireless Working Group ID Identification, Identifier IDCP Internet Device Control Protocol IDCT Inverse Discrete Cosine Transform IDDD International Direct Distance Dialing IDE Intelligent Drive Electronics, Integrated Development Environment IDEA International Data Encryption Algorithm IDF Intermediate Distribution Frame IDFT Inverse Discrete Fourier Transform IDI Initial Domain Identifier IDL Interface Design Language, Interface Definition Language IDLC Integrated Digital Loop Carrier IDN Integrated Digital Network IDNX Integrated Digital Network Exchange IDP Internet Datagram Protocol IDR Intermediate Data Rate IDRA Integrated Dispatch Radio System IDS Information Display System, Integrated Directory Service IDSL ISDN Digital Subscriber Line IDT Information Distribution Company, Integrated Digital Terminal IE Information Element IEB Industrial Electronic Bulletin IEC Inter-Exchange Carrier, International Electrotechnical Commission, International Engineering Consortium IECEE Compliance with IEC for Electrical Equipment IEEE Institute of Electrical and Electronics Engineers IESG Internet Engineering Steering Group IET Instant Electronic Translation IETF Internet Engineering Task Force I-ETS Interim ETS IF Intermediate Frequency IFAST International Forum on AMPS Standards Technology IFBCAInternet Fax & Business Communications Association IFC Installed First Cost, Internet Foundation Class
IFF Identification Friend or Foe IFMPSInterface to FMP Server IFP Internet Facsimile Protocol IFRB International Frequency Registration Board of the ITU IFS Installable File System IFTP Informal FTP area IFU Instruction Fetch Unit IGES Initial Graphics Exchange Specification IGMP Internet Group Management Protocol IGOSSIndustry/Government Open Systems Specification IGP Interior Gateway Protocol IGRP Interior Gateway Routing Protocol IHL Internet Header Length II Information Indicator IIF Inter-working Interoperability Function IIH Intermediate System to Intermediate System "Hello" IIOP Internet Inter-ORB Protocol IIR Institute for International Research IIS Internet Information Server IISP Interim Interswitch Signaling Protocol IIT Integrated Information Transport IITF Information Infrastructure Task Force IKE Internet Key Exchange IKMP Internet Key Management Protocol ILC Identifier Length Content ILD Injection Laser Diode ILEC Incumbent/Independent Local Exchange Carrier ILMI Integrated Local Management Interface, Interim Local Management Interface ILRM Interim Local Management Interface IM Instant Messaging, Inter-Modulation, Inventory Management IMA Interactive Multimedia Association IMACS Integrated Manufacturing Control System IMAP Internet Message-Access Protocol IMBE Improved Multi-Band Excitation IMC Internet Mail Consortium IMD Inter Modulation Distortion, Interface to Mediation Device IMEI International Mobile Equipment Identifier IML Initial Machine/Microcode Load IMP Interface Message Processor IMRS Interactive Multimedia Retrieval Services IMS Information Management System, Interactive Multimedia Services IMSF IS-41 Message Security Forum IMSI International Mobile Subscriber ID, International Mobile Station Identity IMSVS Information Management System/Virtual Storage IMT International Mobile Telecommunications IMTC International Multimedia Teleconferencing Consortium
IMTS Improved Mobile Telephone Service IMUX Intelligent Multiplexer IN Ingress Node, Intelligent Network IN/B Intelligent Network/Broadband INA Information Network Architecture INAA Integrated Network Access Arrangement INAP Intelligent Network Application Profile/Part InARP Inverse Address Resolution Protocol INC International Carrier INCL Intelligent Networked Computing Laboratory IND Information Networks Division INE Intelligent Network Element INI Inter Network Interface INL Internodal Link INM Integrated Network Monitoring INMARSAT International Maritime Satellite Organization INMS Integrated Network Management System INP Internet Nodal Processor INS Intelligent Network Systems, Integrated Network Servicing INTAPInteroperability Technology Association for Information Processing INTELSAT International Telecommunications Satellite Organization InterNIC Internet Network Information Center INTSERV Integrated Services INTUG International Telecommunications Users Group IO Inter-Office IOC Inter-Office Channel IOP Input/Output Processor IOR Index of Refraction, Interoperable Object References IP Internet Protocol, Intellectual Property, Intelligent Peripheral IPAD Internet Packet Assembler Dis-assembler IPBX Internet PBX IPC Inter-Process Communication IP-CME Circuit Multiplication Equipment optimized for IP-based Networks IPDC IP Device Control IPDR IP Detail Record I-PDU Information PDU IPF Information Processing Function IPI Internal Programming Interface IPMH Inter-Process Messaging Handling IPN Intelligent Packet Network IPNG Internet Protocol Next Generation IPNS ISDN PBX Network Specification IPP Internet Printing Protocol IPR Intellectual Property Rights IPRA Internet PCA Registration Authority IPS Instructions per Second
IPSEC Internet Protocol Security IPSIT International Public Sector IT IPSP IP Security Protocol IPT Internet Protocol Telephony IPUI International Portable User Identity IPv6 Internet Protocol Version 6 IPX Internetwork Packet Exchange IR Infrared, Ingress Router, Instruction Register IRA International Reference Alphabet, Internet Routing Address IRAS Internet Routing and Access Service IRB Instruction Reorder Buffer IRC Internet Relay Chat IrDA (IRDA) Infrared Data Association, Infrared Interface Committee IRDS Information Resource Dictionary System IREG ITU-T Recommendation Experiment Group IRM Inherited Rights Mask, International Roaming IRP Independent Routing Processor IRQ Interrupt Request IRR Information Request Response IRS Intermediate Reference System IRSG Internet Research Steering Group IRTF Internet Research Task Force IRV Initial Repeat Value IS Interim Standard, International Standard, Intermediate System IS-41 US Mobile Architecture IS-54 US TDMA Standard IS-95 US CDMA Standard ISA Industry Standard Architecture ISAM Index Sequential Access Method ISC International Switching Center ISCRI International Special Committee on Radio Interface ISD Independent Segment Decoding, Integrated Services Digital, Integrated Systems Division, International Standards Development ISD/TT Integrated Services Digital/Tie Trunk ISDN Integrated Services Digital Network ISDN BRA ISDN Basic Rate Access ISDN-BA ISDN Basic Access ISDN-PA ISDN Primary Access ISI USC Information Sciences Institute, Inter Symbol Interference ISIS Information Society Initiatives in Standardization ISL Inter Satellite Links ISLANIntegrated Services LAN ISLP Intersystem Link Protocol ISLU ISDN Line Unit (5ESS) ISMS Integrated Service Management System
ISN
Internet School Networking, Interface Service Node, Information Systems Network ISO International Standards Organization ISOC Internet Society ISODEISO Development Environment ISP Implementation Support Plan, International Signaling Point, International Standardized Profile, Internet Service Provider, Internet Selective Polling ISPBX Integrated Services Private Branch Exchange ISR Intermediate Session Routing ISS Internet Security Scanner, Inter-Satellite Service ISSG Internet Services Study Group ISSI Inter-Switching System Interface ISSIP Inter-Switching System Interface Protocol ISSLL Integrated Services over Specific Links ISSLOW Integrated Services System for Low Bit-rate Environments IST Integrated Services Trunk, ISDN tie trunks IST/TT IST & Other Tie Trunk ISUP ISDN User Part (SS7) ISV Independent Software Vendor ISWG Interoperability Sub-Working Group IT Information Technology, Innovative Technology, Integrated Terminal, Integration Test ITA Industrial Telecommunications Association, IT AdminCenter ITAAB ISDN Technical Advisory Ad hoc Board ITAAG ISDN Technical Advisory Ad hoc Group ITAC Information Technology Association of Canada, ITU-T Advisory Committee ITAC-T International Telecommunications Advisory CommitteeTelecommunications ITAD Integrated Telephone Answering Device ITALSAT Italian Satellite ITAR International Traffic in Arms Regulations ITB Intermediate Text Block ITE Information Technology Equipment ITF Information Transport Function ITFS Instructional Television Fixed Service ITI Information Technology Industry Council, IT Infrastructure ITIC Information Technology Industry Council ITM Informative Test Methods ITN Independent Telecommunication Network ITOC Independent Telephone Operating Company ITP Integrated Technology Planning ITS Institute for Telecommunications Sciences ITSB Image Technology Standards Board ITSM IT Service Management ITU International Telecommunication Union
ITU-D International Telecommunication Union-Telecommunication Development Sector ITUDOCS Electronic Document Service of ITU ITU-R International Telecommunication Union-Radio Communication Sector ITU-T International Telecommunication Union-Telecommunication Standardization Sector ITU-TSB ITU Telecommunications Standardization Board IVCD Initial Voice Channel Designation IVD Internal Vapor Deposition IVDM Integrated Voice Data Multiplexer IVMO Initial Value of Managed Object IVN Intervening Networks IVoD Interactive Video on Demand IVP Integrated Voice Protocol IVPC Integrated Voice Protocol and Commands IVPN International Virtual Private Networks IVR Intelligent Voice Recognition, Interactive Voice Response IVRU Interactive Voice Response Unit IVS Interactive Video Service IW Inside wiring IWF Inter-Working Function IWS Integrated Workflow Services IWU Inter-Working Unit IXC Inter-Exchange Carriers
J JAD Joint Analysis and Design JADSL ADSL for ISDN JBIG Joint Binary Image Group JCCR Joint Committee on Cellular Roaming JCG Joint Coordination Group JDBC Java DataBase Connectivity JDC Japan Digital Cellular JEEC Joint ETSI/ECMA Committee JEM Joint Experts Meeting JEPI Joint Electronic Paynets Initiative JES Job Entry System JFIF JPEG File Interchange Format JFS Journal File System JIS Jurisdictional Interstate Service JITC Joint Interoperability Test Center JM Joint Menu JMAPIJava Management API
JPC Joint Project Committee JPEG Joint Photographic/Picture Expert Group JPT Joint Project Team JRG Joint Rapporteurs Group JRTS Java Run Time System JSD Joint Standards Documents JTACSJapanese TAC System JTAM Job Transfer And Management JTM Job Transfer and Management/Manipulation JURA JPEG Utilities Registration Authority JVM Java Virtual Machine JWG Joint Working Group
K K/D K Kb Kb/s KDC KDP KDS KHz KMC KTA KTS
Keyboard/Display Kelvin Kilobit Kilobits per second Key Distribution Center Kansai Digital Phone Company Key Distribution Service Kilohertz Key Management Center Key Technical Areas Key Telephone System
L L2TP L3 LA LAC
Layer 2 Tunneling Protocol Level 3 Local Application, Location Area, Look Ahead Link Access Control, Local Area Communications, L2TP Access Concentrator, Local Access Concentrator LADC Local Area Data Channels LADS Local Area Data Service LAIC Lawfully Authorized Intercept Capability LAL Log Access Library LAM Lobe Access Module LAN Local Area Network LANE Local Area Network Emulation LAP Link Access Procedure, Local Access Port, Link Access Protocol
LAPB (LAP-B) Link Access Protocol Balanced LAPD Link Access Procedure for D-Channel LAPF Link Access Procedure to Frame Mode Bearer Services LAPM Link Access Procedure for Modems LAPV Link Access Protocol - Video Telephone LAPX Link Access Procedure Half-Duplex LAR Log Area Ratio LASS Local Area Signaling Services LAT Local Area Transport LATA Local Access and Transport Area LAVC Local Area VAX Cluster LAW Local Area Wireless LBC Low Bit rate Coder LBO Line Build Out LBS Location Based Services LBT Listen Before Talk LC Local Currency, Logic Channel LCA Line Circuit Address LCAP Large Cell Access Profile LCD Liquid Crystal Display LCF Location Confirm LCFO Line Current Feed Open LCF-PMD Low Cost Fiber-Physical Medium Dependent LCGN Logical Channel Group Number LCL Longitudinal Conversion Loss LCLT Longitudinal Conversion Loss Transfer LCM Line Concentrator Module LCN Logical Channel Number, Local Communication Network LCP Link Control Protocol LCSN Local Computer Service Network LD Laser Diode, Local Directory, Long Distance LDAP Lightweight Directory Access Protocol LDBL Low Density Bail-Lock LDC LATA Distribution Channel, Long Distance Carrier LDCELP Low Delay CELP LDDI Local Distributed Data Interface (ANSI) LDDS Limited Distance Data Service LDM Limited Distance Modem LDPA Light Document Printing Architecture LDS Local Digital Switch LE Layer Entity, Local Exchange LE/PH Local Exchange/Packet Handler LEC Local Exchange Carrier, LAN Emulation Client LECS LAN Emulation Configuration Server LED Light Emitting Diode LEN Length, Low Entry Networking, Line Equipment Number
LEO Low Earth Orbit LEOS LEOS Low Earth Earth Orbit Orbit Satel Satellit litee LES LES Land Land Ear Earth th Sta Stati tion on,, LAN LAN Emul Emulati ation on Ser Serve ver r LET LET Line Line Equi Equipm pmen entt Tran Transf sfer er LF Logi Login n Fac Facil ilit ity, y, Line Line Feed Feed,, Lar Larges gestt Fra Frame me,, Low Low Frequ Frequen ency cy LFS LFS Log Log Str Struc uctu ture red d Fil Filee Syst System em LFSID Local Form Session Identifier LGC LGC Line Line Grou Group p Con Contr trol olle ler r LH Link Header LHS Left Hand Side LI Lawf Lawful ul Inter nterce cept ptiion, on, Leng Lengtth Indi ndicato cator r LIDB LIDB Line Line Informa Informatio tion n Databas Databasee (ISDN) (ISDN) LIFO LIFO Last Last In Firs Firstt Out Out Li-I Li-Ion on Lith Lithiu ium m Ion LIP LIP Line Line Inter nterco conn nnec ecti tion on Point oint LIPX LIPX Large Large Inter Internet net-wor -work k Packet Packet Excha Exchange nge L IS Logical IP IP Subnet LISN LISN Line Line Impedan Impedance ce Stabi Stabili lizati zation on Networ Network k LL Leased Line LLA Link Link Level Level Acces Access, s, Logi Logical cal Layere Layered d Archi Architec tectur turee LLAP LocalTalk LocalTalk Link Access Protocol Protocol LLAR LLAR Local Local Loop Loop Access Access Ring LLB Line Loop Back LLC Logical Logical Link Link Control Control,, Low Layer Compatibili Compatibility, ty, Lower Layer Capabiliti Capabilities es LLI LLI Logi Logica call Link Link Iden Identi tifi fier er,, Lower Lower Lay Layer er Inf Infor orma mati tion on LLP Low Le Level Pa Parser LLR LLR Loca Locall Loca Locati tion on Regi Regist ster er LMC LMC Loop Loop Main Mainte tena nance nce Cent Center er LMCS Local Multipoint Multipoint Communications Communications System System LMDS Local Multipoint Multipoint Distribution Distribution System System LME LME Laye Layerr Manag Managem ement ent Enti Entity ty LMI LMI Loca Locall Man Manag agem emen entt Int Inter erfa face ce LMOS Line Monitor Unit, Unit, Loop Maintenance Operations Operations System LMR LMR Land Land Mobi Mobile le Radi Radio o LMS LMS Land Land Mobi Mobile le Serv Servic icee LMSI LMSI Local Local Mobile Mobile Stat Station ion Ident Identit ity y LNA LNA Low Low Nois Noisee Ampl Amplif ifie ier r LNB Low No Noise Bl Block LNC LNC Low Low Noi Noisse Con Conve vert rter er LNP LNP Loca Locall Num Numbe berr Por Porta tabi bili lity ty LO Loca Locall Ori Origina ginattion/ on/Osci Oscilllato lator r LOB LOB Line Liness Of Of Bus Busines inesss LOF Loss Of Frame LOH Line Ov Over Head LON LON Loca Locall Oper Operat atin ing g Netw Networ orks ks LOP Local Local Origin Originati ation on Program Programmin ming, g, Line of Posit Position ion,, Loss of Point Pointer er
LORAN Long-Range Ra Radio Na Navigation LOS LOS Loss Loss Of Sign Signal al,, Lin Linee Of Sigh Sightt LOSW Loss Of Synchronous Word Word LP Line Linear ar Pro Progr gram ammi ming ng,, Laye Layerr Prot Protoc ocol ol,, Link Link Pri Print nter er LPC LPC Line Linear ar Pred Predic icti tive ve Codi Coding ng LPDA2 Link Problem Determination Ai Aid 2 LPDP LPDP Local Local Policy Policy Deci Decisio sion n Point Point LPF Low Pass Filter LPIC Primary/ Primary/Presu Presubscri bscribed bed Inter-exchan Inter-exchange/In ge/IntraLAT traLATA A Carrie Carrier r LPO LPO Logi Logica call Po Post Offic fficee LPP Lightw Lightweig eight ht Prese Presenta ntati tion on Proto Protocol col,, Link Link Periph Periphera erall Proces Processor sor LPTV LPTV Low Low Powe Powerr TV LPU LPU Line Line Prot rotecti ection on Uni Unit LPVS Link Packetized Packetized Voice Subsystem Subsystem LR Loudness Rating LRB LRB Loop Loop Rev Rever ersse Bat Battery ery LRC LRC Long Longit itud udin inal al Redu Redunda ndanc ncy y Chec Check k LRCC Last Regist Registrati ration on Control Control Channel Channel LRF Local Local Regis Registra tratio tion n File, File, Locati Location on Regist Registrat ration ion Funct Function ion LRN LRN Loca Locall Rout Routiing Num Numbe ber r LRQ LRQ Loca Locattion ion Requ Reques estt LS Lock Lock Serve erverr, Loo Loop p St Start, art, Link ink Sta Statte LSAS LSAS Line-S Line-Side ide Answer Answer Supervi Supervisio sion n LSB LSB Leas Leastt Si Signi gnifican icantt Bi Bit LSD LSD Low Low Spe Speed ed Data ata Cha Chann nnel el LSI Large Sc Scale Int Inteegration LSL Link Sup Supp port Layer LSMS LNP Service Management System, Local Service Management System System LSO LSO Loca Locall Ser Servi vice ce Off Office ice LSOA LNP Service Service Order Order Administrat Administration ion LSP Line Line Spectr Spectral al Pair, Pair, Loca Locall Servic Servicee Provi Provider der,, Lick Lick State State Packe Packett LSPSD Low-Speed Packet Switched Data LSS LSS Lar Large Stor Storag agee Sys Syste tem ms LSSGR LATA Sw Switching Sy Systems Ge Generic Re Requirements LSTR LSTR Listen Listener er Side-T Side-Tone one Ratin Rating g LSU LAN Service Un Unit LT Link Tr Trailer, Li Line Ter Term minati ation LTE LTE Line Line Term Termin inat atin ing g Equ Equip ipme ment nt LTG Line Tr Trunk Group oup LTP LTP Long Long Ter Term Predi redict ctiion LTS Local Time Server LTU License To To Us Use LU Logical/Line Un Unit LULT Line Unit Line Termination Termination LUNT Line Unit Unit Network Network Terminati Termination on LUS LUS Loca Locati tion on Upda Update te Serv Servic icee
LVD LVD LVDS LVM LVM LW LWG LWG LXT LXT
Low Low Vol Volta tage ge Dire Direct ctiv ivee Low Voltage Voltage Differenti Differential al Signaling Signaling Logi Logica call Vol Volum umee Man Manag ager er Long Wave Logi Logica call Work Work Gro Group up Loca Locall Exc Excha hang ngee Ter Termi mina nall
M M M&A MA MAC
Mandatory, Mo Modulator Merger Mergerss & Acquisi Acquisitio tions ns Map Map Appl Applic icat atio ion, n, Man Manage agerr Agen Agent, t, Movin Moving g Aver Averag agee Manage Managemen mentt Ad Hoc Commit Committee, tee, Media Media Access Access Control, Control, Message Message Authenti Authenticit city y Check, Message Authentication Code, Multiplexed Analog Component MACA Mobile As Assisted Ch Channel Al Allocation MAE MAE Metr Metrop opol olit itan an Area Area Exch Exchan ange ge MAF Manage Managemen mentt Applic Applicati ation on Functi Function on MAH MAH Mobi Mobile le Acce Access ss Hun Hunti ting ng MAHO Mobile Assisted Hand-Off MAIO Mobile Mobile Allocation Allocation Index Index Offset Offset MAN Metropolit Metropolitan an Area Area Network, Network, Mobitex Mobitex Access Access Number MAP MAP Main Mainte tena nanc ncee Admi Admini nist stra rati tion on Pane Panel, l, Mana Manage geme ment nt Appl Applic icat atio ion n Prot Protoc ocol ol,, Manufacturing Automation Protocol, Mobile Application Part MAP MAPDU Mana Manage gem ment ent App Appli lica cati tion on Protoc otocol ol Dat Data Uni Unit MAPI Message Message Applicatio Application n Programmin Programming g Interface Interface MAR MAR Memo Memory ry Addr Addres esss Regis Registe ter r MAS Manage Managemen mentt Applic Applicati ation on System Systemss MASAF Multimedia Se Services Af Affiliate Fo Forum MASC Mobitex Asynchronous Control, Multi-Application Multi-Application Smart Card MATVMaster Antenna Television MAU Media Attachment Attachment Unit, Unit, Multi Multi-stat -station ion Access Access Unit Unit MAWG Message Attachment Work Group MAX MAX Medi Mediaa Acces Accesss Exch Exchang angee MB Mes Message sage Buf Buffer fer, Mac Macro ro Bloc Block k Mb Megabit MBA MBA Macr Macroo-Bl Block ock Addr Addres esss MBD MBD Mana Manage geme ment nt By Dele Delega gati tion on MBE MBE Mult Multii-By Byte te Exte Extens nsio ion n MBFT Multipoint Multipoint Binary Binary File Transfer Transfer MBMP Modem Bank Management Protocol Mbps Million Million bits bits per per second second or Megabit Megabitss per second M-BRIMixed Basic Rate Interface MBS Maximum Maximum Burst Burst Size, Size, Mini Mini Base Base Station, Station, Mobile Mobile Business Business Strategies Strategies Mbyte Mbyte Mega Megaby byte te
MC Maintenance Center, Managed Console, Message Center, Main Cross-Connect MCA Micro-Channel Architecture MCC Mobile Country Code, Modem Control Channel MCCCMultiple Concatenated Convolutional Codes MCD Mobile Communications Division MCF Message Communication Function, Message Confirmation, Mobile Control Function MCI Microwave Communications, Inc., Media Control Interface MCID Malicious Call Identification, Multi-line Caller Identification MCIF Miniature Card Implementers Forum MCM Multi-Carrier Modulation MCMF Multi-Commodity Maximum Flow MCNS Multimedia Cable Network System MCPE Motion Compensated Prediction Error Mcps Mega-chips per second MCPT Multiple Carriers per Transponder MCR Minimum Cell Rate MCS Midrange Computing Strategies, Multi-point Control Services MCU Multipoint Control Unit MCV Multipoint Command Visualization MD Manufacturer Defined, Mediation Device, Message Digest MDACS Modular Digital Access Control System MDB Management Database MDBS Mobile Data Base Station MDC Manufacturer Declaration of Conformity, Mediation Device Communicator MDCP Media Device Control Protocol MDF Main Distribution Frame MDI Medium Dependent Interface MDIS Mobile Data Intermediate System MDLP Mobile Data Link Protocol MDN Mobile Directory Number, Message Disposition Notification MDR Memory Data Register MDS Multipoint Distribution Service, Multipoint Distribution System MDSL Moderate Speed Digital Subscriber Line MDTP Multi-network Datagram Transmission Protocol MDU Multi Dwelling Unit ME Mobile Equipment, Motion Estimation MED Modem Equivalent Device, Multiplexer Entry Descriptor Megacop Media Gateway Control Protocol MEI Multiple Extension Interworking MELP Mixed Excitation Linear Prediction MEOS Medium Earth Orbit Satellite MER Modulation Error Ratio, Message Error Rate MERS Minimal Essential Requirements M-ES Mobile End System
MF
Mediation Function, Multi-Frequency, Multi-tone Frequency, Media Filter, More Fragments MFJ Modified Final Judgment MFLOPS Millions of Floating Point Operations Per Second MFP Multi-Function Peripheral MFPI Multi-Function Peripheral Interface MFPL Multi-Function Peripheral Language MFPP Multi-Function Packet Protocol MFS Metropolitan Fiber Systems MG Media Gateway MGC Media Gateway Controller MGT Mobile Global Title MHEGMultimedia & Hypermedia Experts Group MHP Multimedia Home Platform MHS Message Handling System MHz Megahertz MI Miscellaneous Work Item , Mode Indicator MIA Multi-vendor Integration Architecture MIB Management Information Base MIC Medium Interface Connector, Management Integration Consortium MID Message/Multiplexing Identifier MIF Management Information File, Management Integration Format MIGG MRA Implementation Guide Group MIM Man In the Middle, Management Information Model MIME Multipurpose Internet Mail Extensions (IETF) MIN Mobile Identification Number MIP Multichannel Interface Processor MIPS Millions of Instructions Per Second MIRS Multimedia Information Retrieval Services MIS Management Information Service MIT Management Information Tree, Massachusetts Institute of Technology MIV Multipoint Indication Visualization ML Maximum Likelihood, Multi-Link MLC Multilink Control Field, Multiple Logical Channel MLHGMulti-Line Hunt Group MLID Multi-Link Interface Driver MLM Multi-Longitudinal Mode MLP Multi-Llink Protoco, Multi-Layer Protocoll MLPP Multi-Level Precedence & Preemption ML-PPP Multilink Point-to-Point Protocol MLS Multiple Listing Service, Multi Level Secure MLT Modulated Lapped Transform MLTS Multi-Line Telecommunications Systems, MM Mass Media (FCC), Mobile Management, Mobility Management, MultiMedia, Multimode MMAP Mobility Management Application Protocol
MMC Man-Machine Commands, Microsoft Management Console, Multiple Modulus Conversion MMCF Multimedia Communications Forum MMCOI Multimedia Communications Community of Interest MMDS Multi-channel Multi-point Distribution Service MMDX Multimedia Data Services MMF Memory Mapped Files, Multi Mode Optical Fiber MMG Multimedia Management Group MMITS Modular Multifunction Information Transfer System MMM Mobile Media Mode, Multi-Media e-Mail MMR Modified Modified Read MMRA Model Mutual Recognition Agreement MMS Manufacturing Message Specification, Multimedia Messaging Service MMT Modulation Mode Table MMTSMulti-Media Tele-Services MMU Memory Management Unit MMX Multimedia Extensions MNA Management Network Architecture MNC Mobile Network Code MNE Mobile Network Entity MNP Microcomputer Networking Protocol MNRU Modulated Noise Reference Unit MO Mobile Originated, Managed Object MOA Mobitex Operators Association MOC Maintenance and Operations Console/Center, Managed Object Class, Mobile Originated Call MOCS Managed Objects Conformance Statements MOEOC Message Oriented Embedded Operations Channel MOI Managed Object Instance MOM Manager of Managers, Manager Object Model MOP Maintenance Operations Protocol MOPS Million Operations Per Second MOS Mean Opinion Scoring MOT Managed Object Toolkit MOTIS Message Oriented Text Interchange System MOU Minute of Use, Memorandum of Understanding MP Multi-link PPP, Modulation Parameter MPAKMobitex Packet MPC Multimedia Personal Computer, Multi-Process Communications MPCC Multiprocessor Common Control MPCH Main Parallel Channel MPCI Mobile Protocol Capability Indicator MPCS Mission Planning and Control Station MPD Mode Power Distribution MPE Maximum Permissive Exposure, Maximum Permissible Exposure MPEG Moving/Motion Picture Experts Group
MPI Minimum Picture Interval, Message Processing Interface MPL Multiplex Payload Length field MPLS Multi-Protocol Label Switching, Multi-Protocol Layer Switching MP-MLQ Multi-Pulse - Maximum Likelihood Quantizer MPOAMultiprotocol Over ATM MPP Massive Parallel Processing MPP Mobile Party Pays, Multi-channel Point-to-Point Protocol MPPF Multipoint Protocol Polling Function MPR Multiple Provider Router, Multi-Protocol Router MPS Minimum Performance Specification MPTN Multi-Protocol Transport Network MPTy Multiparty MPU Multiple Port Unit MPX Multiprocessor Extension MQ Modified Quantization MQI Message Queuing Interface MQLVS Multi-Quality Layered Video Service MR Multi-Rate MRA Mutual Recognition Agreements MRC Mixed Raster Content MRI Magnetic Resonance Imaging MRM Meeting Room Management MRP Markov Renewal Process MRPC Multipoint Remote Procedure Call MRU Maximum Receive Unit MS Management Station, Mobile Station, Mode Select, Message Store MSA Metropolitan Statistical Area MSAF Multimedia Services Affiliate Forum MSB Manufacturer Specified Blocks, Most Significant Bit MSC Mobile Switching Center, Message Sequence Chart MSC-BC Mobile Switching Center - Base Center MSCID Mobile Switching Center Identification MSCIN Mobile Switching Center Identification Number MSD Minimum Significant Difference MSDL MPEG-4 Syntactic Description Language MSDNMulti-Service Data Network MSF Multi-Switching Forum MSG Message MSI Manufacturer Specific Information, Maximum Symbol Inversion MSID Mobile Station Identity MSIN Mobile Station Input, Mobile Subscriber Identification Number MSISDN Mobile Station ISDN MSN Multiple Systems Networks, Multiple Subscriber Numbers, Multiple Subscriber Numbering, Microsoft Network MSO Mobile Switching Office, Multiple Systems Operator MSP Marketing and Sales Productivity
MSR Multi-Selective Reject MSRM Mass Storage Reference Model MSRN Mobile Station Roaming Number MSS Mobile Satellite Services, MAN Switching System, Maximum Segment Size MSSF Multi Service Switching Forum MST Multi-Slotted Token, Message Type Field MSVC Meta-Signaling Virtual Channel MSWG Mobile Services Working Group MT Message Type, Mobile Terminated, Mobile Termination, Mode Toggle, MT2 Cellular User's Mobile Termination MTA Major Trading Area, Multimedia Terminal & Applications, Message Transfer Agent MTAUMetallic Test Access Unit MTBF Mean Time Between Failure MTC Message Type Code MTH Module Telecom Home MTIE Maximum Time Interval Error MTM Mobile Test Model MTP Message Transfer Part, Multicast Transport Protocol MTP/SO Multiple Transport Protocol/Self Organizing MTR Mean Time to Repair MTS Multichannel TV Sound, Methodology of Test Suites, Message Telephone/Transfer System MTSO Mobile Telephone Switching Office MTU Maintenance Terminating Unit, Maximum Transfer Unit, Maximum Transmission Unit MUB Multi-Use Bearer Service MUL Mobile User Links MUNDI Multiplexed Network for Distributive and Interactive services MUT Modem Under Test MUTOA Multi-User Telecommunications Outlet Assemblies MUX Multiplexer mv Millivolt MV Membership Vote , Motion Vector MVC Multipoint Visualization Capability MVD Motion Vector Data MVI Multi-Vendor Interaction MVP Multi-Vendor Platform MVPDMulti-channel Video Programming Distributor MVR Multipoint Visualization Refused/Revoked MVS Multiple Virtual Storage mW Milliwatt MWA Measure-Ware Agent MWC Multi-Way Calling MWI Message Waiting Indication MWN Message Waiting Notification
N N Newton NA Numerical Aperture, Network Aspects NA/WCPE North American WCPE NAB National Association of Broadcasters NABER National Association of Business and Educational Radio NAC Null Attachment Concentrator NACD Network Automatic Call Distribution NACK Negative Acknowledgment NACLA National Cooperation for Laboratory Accreditation NACS NetWare Asynchronous Communications Services NADF North American Directory Forum NADHNorth American Digital Hierarchy NAFTA North American Free Trade Agreement NAI Network Access Identifier NAK Negative Acknowledgment NAK-NS Negative Acknowledgment - Not Supported NAK-NU Negative Acknowledgment - Not Understood NAL Network Adaptation Layer NAM Number Assignment Module N-AMPS Narrowband Advanced Mobile Phone System NANC North American Numbering Council NANP North American Numbering Plan NANPA North American Numbering Plan Administration/Administrator NAP Network Access Point NARUC National Association of Regulatory Utility Commissioners NAS Network Application Support, Network Access Servers NASA National Aeronautics and Space Administration NASC Number Administration Service Center NASNA National Association of State 9-1-1 Administrators NASRNG Network Access Server Requirements NAT Network Address Translation NATA North American Telecommunications/Telephone Association NATO North Atlantic Treaty Organization NAU Network Accessible Unit NBC Non-Backward Compatible, National Broadcasting Company NBDG New Business Development Group NBP Name Binding Protocol NBR New Business Release NBS National Bureau of Standards, Net Broadcast Service NC Network Codes, Network Channel, Network Computer, Number of Unallocated Channels at Node
NCA Non-Call Associated NCAG Network Commonality Ad Hoc Group NCAS Non-Call Associated Signaling NCC Network Color Code, Network Control Center NCCF Network Communication Control Facility NCG Number Consulting Group NCI Network Channel Interface, Non Coded Information NCL Networks Communications Laboratory NCOS Network Class of Service NCP Network Connection Point, Network Control Point, Network Control Program, Network Core Protocol NCRP National Council of Radiation Protection & Measurement NCS Network Computing System NCSA National Center for Supercomputing Applications, National Computer Security Association NCTA National Cable Television Association NCTE Network Circuit Terminating Equipment, Network Channel Terminating Equipment NDA Non-Disclosure Agreement NDC National Destination Code NDF New Data Flag NDIS Network Driver Interface Specifications NDS Network Documentation System, Netware Directory Services NDSS Network Directed System Selection NE Network Entity/Element NEAT Network Expert Advisory Tool NEBS Network Equipment Builder Standard, Network Equipment Building Systems NEC National Electric Code NECQ National Electronic Components Quality Assessment System NEF Network Element Function NEI Network Element Interface NEL Network Element Layer NEMANational Electrical Manufacturers Association NENA National Emergency Number Association NEP Network Equipment Provider NES Network Element Server NetBIOS Network Basic Input/Output System NETID Network Identifier NetPC Net Personal Computer NetRPC Network Remote Procedure Call NEW FORUM Former COCOM NEXT Near End Cross Talk NF Noise Figure NFAS Non-Facilities-Associated Signaling NFPA National Fire Protection Agency NFS Network File System
NGDLC Next Generation Digital Loop Carrier NGI Next Generation Internet NGN Next Generation Network NGOF Next Generation Optical Fiber NGSO Non-Geostationary Satellite Orbit NHR Next Hop Resolution NHRP Next Hop Routing/Resolution Protocol NI National ISDN, Network Element, Network Interface NI-1 National ISDN-1 NIA Network Indicate Address NIBS National Institute for Building Standards NIC Network Independent Clocking, Network Information Center, Network Interface Card, National ISDN Council NiCd Nickel Cadmium NICE Network Information and Control Exchange NID Network Identification, Network Interface Device, Network Interface Demarcation, Node ID NII National Information Infrastructure NIIG National ISDN Interface Group NIM Network Interface Module NiMH Nickel Metal Hydride NIO Network Input Output NIP Number Identification Presentation NIPG National ISDN Parameter Group NIS Network Information Service NISDN National ISDN N-ISDN Narrowband Integrated Services Digital Network NISP Network Inventory & Service Provisioning NIST National Institute of Standards and Technology NIU Network Interface Unit NIUF National ISDN Users Forum NJE Network Job Entry NL Number of Unallocated Channels on Link, Network Layer NLC Node Line Card NLD Non-Linear Distortion NLDMNetwork Logical Data Manager N-LLCNarrowband Logical Link Control NLM NetWare Loadable Module NLP Network Layer Protocol , Non-Linear Processor NLPIDNetwork Layer Protocol Identifier NLS Native Language Support NLSP NetWare Link Services Protocol NM Network Management/Module Nm Nanometer NMA Network Management & Administration, Network Monitoring & Analysis NMAG Network Management Ad hoc Group
NMASNetwork Management System NMC Network Management Center, Network Model Coverage NMCS NMC System NME Network Management Entity NMF Network Management Forum NML Network Management Layer NMM Network Map Management NMO NM Option, NetMetrix Operation NMP Network Management Protocol NMS Network Management System NMSI National Mobile Station Identification NMT Nordic Mobile Telephone NMVTNetwork Management Vector Transport protocol NN Network Node NNI Network Node Interface, Network-to-Network Interface NNM Network Node Manager NNTP Network News Transfer Protocol NOC Network Operations Center NOCC Network Operations Control Center NOF Network Operations Forum NOI Notice of Inquiry NOS Network Operating System NOTE Network Office Terminating Equipment NP Network Provider, Number Portability NPA Network Planning Area , Network Provider Access, Numbering Plan Area NPAC Number Portability Administration Center NPC Network Parameter Control N-PCS Narrowband PCS NPDA Network Problem Determination Application NPDB Number Portability Database NPDU Network Layer Protocol Data Unit NPI Numbering Plan Identification/Indicator NPID Network Provider Identification NPR Noise Power Ratio NPRM Notice of Proposed Rulemaking NPRP Number Portability Routing Protocol NPS Network Planning System NPSI Network Packet Switching Interface NPV Net Present Value NRC Negotiated Rulemaking Committee, Network Reliability Council NREN National Research and Education Network NRM Network Reference Model, Normal Response Mode NRP Node Route Processor NRR Network Restoration Ratio NRTL Nationally Recognized Test Laboratory NRZ Non-Return to Zero
NRZI Non-Return to Zero Inverted NS Network Systems NS/DOS Networking Services/DOS NS/EP National Security & Emergency Preparedness NSA Non-Service-Affecting, Network Systems Architecture Lab, National Security Agency NSAMNetwork, System and Application Management NSAP Network Service Access Point NSB National Standardization Body NSC Non-Standard Facilities Command, Network Service Center NS-cap Non-Standard Capability NSF National Science Foundation NSFnet National Science Foundation Network NSI Non-SNA Interconnect, Network Service Interface NSIE Network Security Information Exchange NSM Network Status Monitor, Networked Systems Management, Network Service Module NSMANational Spectrum Managers Association NSMDNetwork and Systems Management Division NSN Network Services Node NSO National Standard Organization NSP Network Services Part/Protocol, National Signaling Point, Node Switch Processor NSS Network Sub-System, Non-Standard Setup NSTAC National Security Telecommunications Advisory Committee NSTC National Science and Technology Center NT Network Termination, New Technology, Node Type NTAS New Technology Advanced Server NTCA National Telephone Cooperative Association NTE Network Terminating Equipment NTIA National Telecommunications & Information Administration NTO Network Terminal Option NTP Network Termination Point, Network Transaction Processors, Network Time Protocol NTQ Near Toll Quality NTR Network Timing Reference NTRAC New Technical Recommendation Application Committee NTSC National Television Standards Committee, National Television System Committee NTT Nippon Telephone and Telegraph NTTC National Technology Transfer Center NUI Network User Identification NVCASE National Voluntary Conformity Assessment System Evaluation NVE Network-Visible Entities NVLAP National Voluntary Laboratory Accreditation Program NVODNear Video on Demand NVRAM Nonvolatile Random Access Memory (RAM)
NVT Network Virtual Terminal NWK Network NYIIX New York International Internet Exchange
O O Optional O&NM Operations & Network Management O/E Optical-to-Electrical OA&M Operations, Administration, & Maintenance OAA On Air Activation OACSU Off Air Call Set Up OAM Operation, Administration, Management OAM&P Operation, Administration, Management & Provisioning OAN Optical Access Network OAP One-step Approval Procedure , Organization Alignment Process OAS Open Application Server, Organization of American States OASISOpen And Secure Information Systems OATS Over-the-Air Activation TeleService OBN Out of Band Noise OBP On-Board Processing OC Operations Channel, Operation Center, Output Controller, Optical Carrier OCC Other Common Carriers OCCA Open Cooperative Computing Architecture OCDMA Orthogonal CDMA OCG Operational Coordination Group , Overall Coordination Group OCI Open Circuit Interval OCN Operational Carrier Number OC-n Optical Carrier OCR Optical Character Recognition OCU Office Channel Unit ODA Open Document Architecture ODAI Origin/Destination Address Indicator ODBC Open DataBase Connectivity ODI Open Data-link Interface ODIF Open Document Interchange Format ODL Object Definition Language ODP Open Distributed Processing, Originator Detection Pattern ODTC Office of Defense Trade Controls OE Originating Equipment OEM Original Equipment Manufacturer OEMF Open Element Management Framework OET Office of Engineering & Technology OFB Output FeedBack
OFD Optical Frequency Demultiplexer OFM Optical Frequency division Multiplexer OFS Operational Fixed Service OFSTP Optical Fiber Systems Test Procedure OFTEL Office of Telecommunications (Great Britain) OFX Open Financial Exchange OGL Operator GuideLines OGM Out-Going Message OGP Object Generic Part OHG Operators Harmonization Group OID Object Identifier OIM Operations Interface Module OIMCF OIM Common Functions OIMDF OIM Dedicated Function OIS Office Information System OIW Open Systems Implementers Workshop OJ Official Journal OLC Optical Loop Carrier, Open Logical Channel OLE Object Linking and Embedding OLEC Other Local Exchange Carrier OLP On-Line Provisioning OLR Overall Loudness Rating OLTP Online Transaction Processing OM Operational Measurement OMA Object Management Architecture OMAPOperation and Maintenance Application/Administration Part OMC Operations and Maintenance Center OMCS OMC System OMG Object Management Group OML Output Manual OMP Operation and Maintenance Processor, Open Management Platform OMT Object Modeling Technique, Overhead Message Train ONA Open Network Architecture ONC Open Network Computing ONE Open Network Environment, Other Network Entities ONMSOpen Network Management System ONP Open Network Provision ONS On Premise Station ONT Optical Network Terminal ONU Optical Network Unit OO Object Oriented/Orientation OOB Out of Band OOD Object Oriented Design OOF Out of Frame OOP Object-Oriented Programming OOPS Object-Oriented Programming System
OOS Out Of Service, Out Of Synchronization OP OmniPoint OPC Origination Point Code OPI Open Protocol Interface OPID Operator Identifier OPPW Operator Password OPS Off Premise Station OPS/INE Operations System/Intelligent Network Element OPTS Over-the-Air Programming Teleservice OPX Off Premise Extension OR Office Regenerator ORB Object Request Broker, Office Repeater Bay ORDQ Order Qualification ORM Optically Remote switching Module ORREQ Origination Request ORS Object Registration Service OS Operating System, Operation Support, Open Systems OSC Orbital Sciences Corporation OSF Open Software Foundation, Operation System Function OSHA Occupational Safety & Health Administration OSI Open Switching Interval, Open Systems Interconnection OSI RM Open Systems Interconnection Reference Model OSI/CS OSI/Communications Subsystem OSI/FS OSI File Services OSI/NMF OSI Network Management Forum OSIE Open Systems Interconnection Environment OSInet OSI Network OSIRM Open Systems Interconnection Reference Model OSLP Operation Service Logic Program OSM Object Status Map OSN One Stop Notification OSO Originating Screening Office OSP Outside Plant, Open Settlement Protocol OSPF Open Shortest Path First OSS Operation Support Systems OSSD Open Systems Software Division OSSO On-Site Service Order OSTF Object Services Task Force OTA Over The Air OTAA Over The Air Activation OTAF Over The Air Function OTAFG OTA Focus Group OTAPA Over the Air Parameter Administration OTAR Over-the-Air Rekeying OTASP Over the Air Service Provisioning OTC Operating Telephone Company
OTD Optical Time division Demultiplexer OTDMOptical Time Division Multiplexing OTDR Optical Time Domain Reflectometer OTF Open Token Foundation OTFI One Time Feature Indicator OTI Open Telecom Infrastructure OTN Optical Transition Nodes OTP One Time Password OU Organizational Unit OUI Organizationally Unique Identifier OVD Outside Vapor Deposition OVDM Openview Distributed Management Ovw Openview Windows
P P Predicted Pictures (MPEG) P&A Privacy & Authentication P/F Poll/Final Bit PA Partial Agreement, Pass Along, Pointer Adjustment, Preamble PABX Private Automatic Branch Exchange PAC Program Advisory Committee PACA Priority Access & Channel Assignment PACA-E Enhanced Priority Access & Channel Assignment Supplement Service PACC Partition, Aggregation & Conditional Coding PACE Personal Audio Computer Editing PACK Positive Acknowledgment PACS Personal Access Control System, Personal Access Communication System PACT Program for the Acceleration of Technology PAC-U Personal Access Communications System, Unlicensed Band PAD Packet Assembler/Dis-assembler PAGCH Paging and Access Grant Channel PAGODA Profile Alignment Group on ODA PAL Phase Alternate Line (TV) PAM Pulse Amplitude Modulation, Payload Assist Module PAMS Perceptual Analysis/Measurement System Pani Pseudo Automatic Number Identification PAP Password Authentication Protocol, Printer Access Protocol, Process Access Protocol PAR Parameter Field, Peak to Average Ratio, Pixel Aspect Ratio, Positive Acknowledgment with Retransmission PAS Publicly Available Specification PASC PCS Access Service for Radio Controllers PAT Program association table
PAW Personal Area Wireless PB Personal Base, Predicted & Bi-directional PBNM Policy Based Network Management PBO Power Back Off PBP Packet Burst Protocol PBS Public Broadcasting System, Personal Base Station PBX Private Branch Exchange PC Personal Computer, Personal Computing, Priority Control, Principal Consultant, Program Counter, Path Control PC_SSN Point Code Sub-System Number PCA Password Call Acceptance, Policy Certification Authority, Policy Group proposal on CA PCB Process Control Block PCC Per Call Control, Pre-activation Communications Channel, Private Control Channel PCCA PCMCIA Communication Card Association, Portable Computer Communications Association, Parallel Concatenated Convolutional Codes PCCC Parallel Concatenated Convolutional Codes PCF Personal Call Forwarding, Picture Clock Frequency, Point Coordination Function PCH Paging Channel PCI Peripheral Component Interface/Interconnect, Personal Communications Interface, Programmable Communications Interface, Protocol Capability Indicator, Protocol Control Information PCI SIG Peripheral Component Interconnect Special Interest Group PCIA Personal Communications Industry Association PCIO Program Controlled I/O PCL Power Line Communication, Printer Control Language, Product Computing Module Load PCM Pulse Code Modulation PCMCIA Personal Computer Memory Card International Association PCME Packet Circuit Multiplication Equipment PCN Personal Communications Network PCNE Protocol Converter for Non-SNA Equipment PCO Product Change Order PCP Programmable Communication Processor PCR Preventive Cyclic Retransmission, Peak Cell Rate, Program Clock Reference PCS Personal Communications Services PCSA Personal Computing Systems Architecture PCSAP PCS Application PCSC Personal Communications Switching Center PCSD Personal Communications Services Description PCT Pair-wise Correlating Transform, Private Communications Technology PCTF Per-Call Test Failure PCU Premises Control Unit PD Protocol Discriminator, Photo Diode, Propagation Delay PDA Personal Digital Assistant
PDAMProposed Draft Amendment PDC Personal Digital Cellular, Password Delivery Center PDI V Payload Defect Indicator - Virtual PDI-P Payload Defect Indicator - Path PDL Polarization Dependent Loss, Public Distribution List PDM Physical Medium Dependent, Product Data Management PDN Public Data/Digital Network, Primary Directory Number, Packet Data Network PDP Policy Decision Point PDS Premises Distribution System, Phase Dithering Sequence PDU Protocol Data Unit PDU-MUX Protocol Data Unit Multiplexer PDV Packet Delay Variation PE Policy Enforcement element, Poly Ethylene, Public Inquiry PEL Picture Element PEM Privacy Enhanced Mail PEP Packetized Ensemble Protocol, Policy Enforcement Point, Protocol Extension Protocol, Partitioned Emulation Program PER Packet Error Rate, Packed Encoding Rules, Parameter Error Rate PEX ETSI Help Desk for Conformance PF Poly-center Framework, Presentation Function PFD Power-flux Density PFDL Policy Framework Definition Language PFF Proprietary FMP Format PGP Pretty Good Privacy PH Packet Handler PHB Per-Hop Forwarding Behavior PHCF Hard Polymer Clad Fiber PHD Parallel Hybrid Device Pho Photonic PHP Personal Handyphone PHY Physical Layer Working Group of ATM Forum PIB Policy Information Base PIC Personal Intelligent Communicator, Primary/Pre-subscribed Inter-exchange Carrier, Programmable Interrupt Controller PICS Platform for Internet Content Selection, Protocol Implementation Conformance Statement PID Protocol Identifier PIDX Petroleum Industry Data Exchange PIM Passive Inter-modulation, Personal Information Management, Protocol Independent Multicast PIN Positive-Intrinsic-Negative (Fiber Optics), Personal Identification Number PING Packet Internet Groper (TCP/IP) PINS Project Initiation Notification System PINT PSTN Inter-working PINX Private Integrated Network Exchange PIP T.30 procedural interrupt positive
PIR Project Issue Report PISN Private Integrated Services Network PIU Path Information Unit PIXIT Profile Initialization for Test Cases PJC Pointer Justification Count PKS Public Key Service PL Physical Layer, Preferred Language, Private Line, Program Lock PLAR Private Line Auto Ring, Private Line Automatic Ring-down PLB Payload Loop Back PLC Power Line Communication PLCP Physical Layer Convergence Protocol PLE Path Length Efficiency PLI Power Line Interference PLL Phase-Locked Loop PLMN Public Land Mobile Network PLMTS Public Land Mobile Telecommunications System PLOAM Physical Layer Operations, Administrations & Maintenance PLP Packet Layer Protocol PLS Physical Layer Specification PLU Primary Logical Unit PLUS Professional Labor Utilization System PM Performance Management, Performance, Peripheral Modules Monitoring, Processable Mode, Phase Modulation, Physical Medium PMA Physical Medium Attachment PMC Packet Mode Channel PMCC Packet Mode Channel Connect PMCE Packet Mode Channel Element PMCH Packet Mode Channel Handler, Packet Mode Channel Call Control PMD Physical Media Dependent layer, Physical Medium Dependent, Polarization Mode Dispersion PMM Protocol Management Module PMO Present Mode of Operation PMR Peak-to-Mean Ratio, Private Mobile Radio PMS Physical Media Specific, Project Management System PMT Program Management Team PN Project Number PNA Parallel Network Architecture PNC Paging Network Controller PNE Path Number Efficiency, Production of Norms in Europe PNNI Private Network-Network Interface, Private Network Node Interface PNP Private Numbering Plan PNT Phone-line Network Transceiver PO Purchase Order POC Points of Contact, Proof-of-Concept, Public Operator's Code POCSAG Post Office Code Standardization Advisory Group POD Programmable Option Devices
POF Plastic Optical Fiber, Private Operating Frequencies POH Path Overhead POI Point of Interconnect PON Passive Optical Network POP Point of Presence, Post Office Protocol POR Plan Of Records POS Point of Sale POSI Promotion of OSI POSIT Profiles for Open Systems Inter-working Technologies POSIXPortable Operating System Interface for UNIX POST Power-On Self Test POT Point Of Termination POTS Plain Old Telephone Service PoV Packet over VDSL PP Payload Pointer, Portable Parts, Prepaid PPD Proposal Package Description PPDN Public Packet Data Network PPDU Presentation Protocol Data Unit PPG Personal Information Products Group PPI PCS to PCS Interference Ppm Pulses per Minute PPM Pulse Position Modulation PPP Point-to-Point Protocol PPPoAPPP over ATM PPS Packets Per Second pps Pulses per Second PPSN Public Packet-Switched Network PR&A Project Request & Authorization PRA Primary Rate Access PRBS Pseudo Random Binary Sequence PRC Primary Reference Clock, Private Channel PRI Primary Rate Interface (ISDN) PRM Performance Report Messages, Premium Rate PRNS Pseudo Random Noise Sequence PRO Planning & Reporting Officer PROFS Professional Office System PROM Programmable Read Only Memory PRS Primary Reference Source PS PCSC ISDN Switch, Product Safety, Protocol Stack, Packet Switch, Privilege Service, Power Supply PSA Protocol-Specific Annex, Polled Sub-Address PSAP Public Safety Answering Point PSB Public Service Board PSC Public Service Commission, Picture Start Code PSD Personal Security Devices, Power Spectral Density PSDN Packet/Public Switched Data Network
PSDS Public Switched Digital Service PSI Packet Switching Interface, Program Specific Information PSI-CELP Pitch Synchronous Innovation CELP PSID Private System Identifier PSIDS Private System ID Service PSK Phase Shift Keying PSM Personal Storage Management PSN Packet-Switched Network , Private Switched Network PSNP Partial Sequence Number Packet PSNR Peak Signal to Noise Ratio PSO Private Service Operator, Professional Services Organization PSP Public Service Profiles PSPDN Packet Switched Public Data Network PSQM Perceptual Speech Quality Measure PSS1 Private Network Signaling System 1 PST Product Service and Tariff administration PSTN Public Switched Telephone Network PSVCI Point-to-Point Signaling VCI PSW Program Status Word PSWG Product Safety Working Group PT Payload Type, Portable radio Terminal, Project Team PTC PictureTel Transform Coder PTCC Pex & Testing Competence Center PTE Path Terminating Equipment (SONET) PTI Packet/Payload Type Identifier PTM Packet Transport Mode PTN Public Telephone Network, Private Telecommunications Networks PTO Private Telecommunications Organizations PTR Pointer PTS Pay Terminal System, Protocol Type Selection PTT Public Telephone & Telegraph; Post Telephone & Telegraph Administration; Postal, Telephone & Telegraph Authority; Push to Talk PU Physical Unit, Presentation Unit PUC Public Utility Commission PUCP Physical Unit Control Point PUK PIN Unblocking Key PUM Personal User Mobility PVC Permanent Virtual Connection, Poly Vinyl Chloride PVN Private Virtual Network PWA Password Access PWACPresent Worth of Annual Charges PWCE Present Worth of Capital Expenditures PWD Password PWG Printer Work Group PWT Personal Wireless Telecommunications
PWT-E
Personal Wireless Telecommunications - Enhanced Interoperability Standard
Q Q&A Question & Answer QA Q Adapter QADM Quadrature Audio Data Modulation QAF Q Adapter Function QAM Quadrature Amplitude Modulation QAS Quasi Associated Signaling QASPR Qualcomm Automatic Satellite Position Reporting Q-bit Qualified Data Bit QCELP Qualcomm's Proprietary Version of CELP QCIF Quarter Common Intermediate Format QIC Quarter-Inch Cartridge Tape QLLC Qualified Logical Link Control QMS Quality Maturity System QoS Quality of Service QP Quantization Parameter QPA Quality Performance Analysis QPSK Quadrature Phase Shift Keying QPSX Queued Packet Synchronous Exchange QSDG Quality of Service Development Group QUANT Quantization Parameter QUEST Quality Excellence for Suppliers of Telecommunications
R R R reference point, Router R&D Research & Development R&O Report & Order R&TTE Radio and Telecommunications Terminal Equipment R-2000 1st Generation Cellular Standard RA Routing Arbiter (Internet), Return Alarm RAB Registrar Accreditation Board RACE Research and development for Advanced Communications in Europe RACF Radio Access Control Function RACH Random Access Channel RAD/RASP Remote Antenna Device/Remote Antenna Signal Processing RADIUS Remote Access/Authentication Dial-In User Server RADSL Rate Adaptive Digital Subscriber Line
RAI Remote Alarm Indication RAID Redundant Array of Inexpensive/Independent Disks RAL Restricted Access Location RALB Resource All Busy RAM Random Access Memory, Reset Acknowledgement RAMA Resource Auction Multiple Access RAN Radio Access Network RAND Random Challenge Memory RAO Revenue Accounting Office RARP Reverse Address Resolution Protocol RAS Registration, Admission, & Status, Remote Access Service RASC Radio Access System Controller RAST Receive And Send Terminal RAU Remote Antenna Unit RB Radio-communications Bureau RBAF Radio Bearer Adaptation Function RBB Residential Broadband RBBS Residential Broadband Service RBER Residual Bit Error Rate RBOC Regional Bell Operating Company RBS Robbed-Bit Signaling RBTESC Routing, Bridging, & Transfer of Emergency Service Calls RCC Reverse Control Channel, Radio Common Carrier RCDD Registered Communications Distribution Designer RCE Remote Channel Extenders RCELP Residual CELP RCF Radio Control Function, Registration Control Field, Routing Control Field RCH Random Access Channel RCP Remote Communications Processor, Radio Control Protocol RCPC Rate Compatible Punctured Convolutional RCR Research and development Center for Radio systems RCV Receive RCVR Receiver Sequence Number RD Received Data, Request Disconnected, Routing Domain, Rate Distortion RDB Relational Data Base RDBMRelational Data Base Management RDC Remote Device Control RDF Route Designator Field, Remote Distribution Frame RDI Remote Defect Indicator RDI-L Remote Defect Indicator - Loop RDI-P Remote Defect Indicator - Path Level RDI-V Remote Defect Indicator - Virtual RDN Relative Distinguishing/Distinguished Name RDS Radio Data System RDSS Radio Determination Satellite Service RDT Remote Digital Terminal
RDTD Restricted Differential Time Delay REA Rural Electrification Association REC Receive Alarm REI-L Remote Error Indicator - Line Level REI-P Remote Error Indicator - Path Level REJ Reject REL Release Message, Release RELP Regular-Pulse Excited LPC, Residual Excited Linear Prediction REM Ring Error Monitor REN Ringer Equivalent Number REP Repeat REQ Request RES Resume, Radio Equipment and Systems RESCAP Resource Capabilities discovery RESCU Remote Emergency Satellite Cellular Unit RESP Response RET Returning RF Radio Frequency RFC Remote Feature Control, Request for Comments RFH Remote Frame Handler (ISDN) RFI Radio Frequency Interference, Request for Information RFP Radio Fixed Parts, Request for Proposal RFQ Request for Quotation RFT Request for Technology RFTR Radio Frequency Transmission and Receiving RG Research Group, Ring Ground, Residential Gateway, RGB Red Green Blue RGIP Residential Gateway Internal Protocol RH Request/Response Header, Multiple HDLC Receive RHC Regional Holding Company RHS Right Hand Side RI Ring In, Ring Indicator, Reference Indicator RIF Routing Information Field RII Routing Information Indicator RIL Radio Interface Layer RIM Request Initialization Mode (HDLC) RIN Relative Intensity Noise RIP Request In Process, Routing Information Protocol, Raster Image Processor RIPE Regional Internet Registry for Europe RISC Reduced Instruction Set Computer RJE Remote Job Entry RKB Ring Knowledge Base RL Repeat Limit, Return Loss RLAN Radio Local Area Network RLC Release Complete RLCI Receive Line Clock Input
RLDI Receive Line Data Input RLP Radio Link Protocol RLR Receive Loudness Rating RLSD Received Line Signal Detect RM Recovery Manager, Resource Management RMC Regional Management Center RMDRRemainder RMI Remote Method Invocation RMOA Real-time Multimedia Over ATM RMON Remote Network Monitoring RMP Reliable Multicast Protocol RMS Remote Monitoring System, Root Mean Square RN Routing Number RNMCRegional Network Management Center RNR Receive Not Ready RNUD Raw Network Usage Data units RO Ring Out ROA Recognized Operating Agency ROAMOPS Roaming Operations Task Force ROC Report on Comments ROI Rate On Investment ROLR Receive Objective Loudness Rating ROM Read-Only Memory ROMP Remote Operations Microprocessor ROR Rate of Return ROS Remote Operations Service ROSE Remote Operation Service Element ROSI Radio Signaling Protocol ROT Receive Only Terminal RP Radio Ports, Reference Points RP-AS Ringing, Pulse-Alerting Signal RPC Radio Port Coupler, Remote Procedure Call RPCU Radio Port Control Unit RPE Regular Pulse Excitation RPF Remote Power Feed RPM Resource and Performance Management, Remote Port Module RPOA Recognized Private Operating Agency RPR Reference Picture Resampling RPS Ring Parameter Server, Reference Picture Selection RPU Revenue Per User RPWM Rules of Procedure & Working Methods RQV Running Quality Value RR Radio Resource Management, Receiver Ready, Resource Reservation Protocol RRJ Registration Reject RRQ Return Request, Registration Request RRU Reduced Resolution Update
RS
Radio System, Radio-communications Sector, Receive Signature, Registry Service, Rectangular Slice, Reed-Solomon RSA Rivest, Shamir and Adleman, Rural Service Area RSB Robbed Bit Signaling RSCS Remote Spooling Communications Subsystem RSCV Route Selection Control Vector RSDN Regional Switched Digital Network RSE Real System Environment RSF Residential Standards Forum RSGCP Reliable Signaling Gateway Control Protocol RSGP Reliable Signaling Gateway Protocol RSID Residential System Identification RSM Remote Switching Module, Radio Subsystem Management RSN Remote Service Network RSS Received Signal Strength, Remote Switching Sites, Remote Switch Subsystem RSSI Received Signal Strength Indication, Received Signal Strength Identification RSU Remote Switching Unit Rsvd Reserved RSVP Resource Reservation Protocol RSX Real-Time Resource Sharing Executive RT Remote Terminal, Round Trip, Rotation Time, Routing Type RTC Return to Control RTCA Radio Technical Commission for Aeronautics RTCP Real-time Transport Control Protocol RTD Round Trip Delay RTE Remote Terminal Equipment RTF Radio Terminal Function RTLM Real Time Link Management RTMP Routing Table Maintenance Protocol RTP Rapid Transport Protocol, Routing Update Protocol, Release to Pivot, Real Time Protocol RTR Revised Technical Report RTS Request to Send, Revised Technical Specification RTS-CTS Request to Send - Clear to Send RTSE Remote/Reliable Transfer Service Element RTSP Real-Time Streaming Protocol RTT Radio Transmission Technologies RTTE Radio & Telecommunication Terminal Equipment RTU Right to Use, Remote test Unit RTX Request Retransmission RTYPE Rounding Type RU Request/Response Unit RUFP Reflected Unique Findable Pattern RVI Reverse Interrupt RVLC Reversible Variable Length Codes RVSA Remote Variant Selection Algorithm
RW Receiver Window Rx Receiver RXLEV-DL Received Level Downlink RXLEV-UL Received Level Uplink RXQUAL-DL Received Quality Downlink RXQUAL-UL Received Quality Uplink RZ Return to Zero RZ-SSB Return to Zero SSB
S S&R Segmentation & Re-Assembly S/ATT Satellite Analog Tie Trunk S/DMS SONET/Digital Multiplex System S/DTT Satellite Digital Tie Trunk S/N Signal-to-Noise Ratio S/R Suspend/Resume SA Service Affecting, Security Association, Sub-Area, Source Address SAA Service Adaptive Access, Systems Application Architecture, Service Affecting Alarm SAAC Syntax-Based Adaptive Arithmetic Coding SAAL Signaling ATM Adaptation Layer SABM Set Asynchronous Balanced Mode SABME Set Asynchronous Balanced Mode Extended SAC Service Area Code, Service/Subscriber Access Code, Syntax-based Arithmetic Coding, Single Attachment Concentrator SACCH Slow Associated Control Channel SACF Single Association Control Function SAD Sum of Absolute Differences SAFER Secure & Fast Encryption Routine SAGE Security Algorithms Group of Experts SAID Serving Area ID SAM Service Access Multiplexer, Subsequent Address, Suspicious Activity Monitor, System Administration Manager SAMI SAM Interface SAN Satellite Access Network point SANC Signaling Area Network Code SAP Service Advertising Protocol, Service Access Point, Segmentation Application Point SAPI Service Access Point Identifier SAR Segmentation And Reassembly, Service Assurance Representative SARM Set Asynchronous Response Mode SAR-PDU Segmentation & Reassembly PDU
SAS
Service Activation System, Single Attached Station, Smart Antenna Savvy, Subscriber Alerting Signal SASE Specific Applications Service Element SASET Secure Audio SET SAT Satellite, Satellite ATM, Supervisory Audio Tone SATAN System Administrator Tool for Analyzing Networks SAVD Simultaneous or Alternating Voice Data SAW Surface Acoustic Wave SB Signal Battery S-BCCH Short Message Service Broadcast Control Channel SBE Single Byte Extension SBI Sub-Bitstream Indicators, Synchronous Backplane Interface SBID Stuff Bit ID SBM Single Bitmap SBSD Supplementary & Bearer Service Description SBSVC Selective Broadcast Signaling Virtual Channel SC Shared Channel, Subscriber Confidentiality SCA System Communication Architecture, Selective Call Acceptance SCADA Satellite Collection & Data Access SCAI Switch-to-Computer Applications Interface SCAP Smart Card Administration Package SCaps Capabilities with Sub-fields SCC Satellite Control Center, Standards Coordinating Committee, Standards Council of Canada, Switching Control Center SCCP Signaling Connection Control Point/Part, Single Cell Control Channel SCCS Switching Control Center System S-CDMA Synchronous Code Division Multiplex Access SCE Service Creation Environment SCEF Service Creation Environment Function SCELP Spike Code Excited Linear Prediction SCF Service Control Function, Shared Control with Feedback, Supervisory and Control Function, Synchronization and Convergence Function, System Communication Function SCH Synchronization Channel SCM Single-Carrier Modulation, Station Class Mark, Support for Customer Management SCN Switched Circuit Network SCO Santa Cruz Operation SCORE Signal Communications for Orbiting Relay Equipment. SCOT Steering Committee on Telecommunications SCP Service Control Packet, Service Control Point, Service Creation Point, Signal Control Point, Signaling Control Point, Session Control Protocol SCPC Single Channel Per Carrier SCR Selective Call Rejection, Sustainable Cell Rate SCS SNA Character String SCSA Signal Computing System Architecture
SCSC Subcommittee on Standards and Conformance SCSI Small Computer Systems Interface SCSI-2SCSI revision 2 SCTE Society of Cable Television Engineers, Serial Clock Transmit External, ScTP Screened Twisted Pair SD Starting Delimiter, Spectral Data SDB Switched Digital Broadcast SDC Supplier's Declaration of Conformity SDCC Supplementary Digital Color Code SDCCH Standalone/Secondary Dedicated Control Channel SDD Stutter Dialing Device, Super Density Disc SDDI Shielded Twisted Pair Distributed Data Interface SDF Service Data Function, System Directory Function SDH Synchronous Digital Hierarchy SDL Specification and Description Language, Sales and Delivery Leads SDLC Synchronous Data Link Control SDM Space Division Multiplexing SDMT Synchronized DMT SDN Switched Digital Network, Software Defined Network SDO Standards Development Organization SDOC Supplier's Declaration of Conformity SDP Service Data Point SDQL Standard Document Query Language SDR Sequence Determined Redundancy, Special Drawing Right SDRP Source Demand Routing Packet SDS Simulcast Delay Spread, Software Distribution Service, Switched Digital Service, Scientific Data Systems SDSAF Switched Digital Services Applications Forum SDSL Simultaneous DSL, Symmetrical High Bit Rate, Symmetric Digital Subscriber Line SDSS Server Display And Script Services SDSU SMDS Data Service Unit SDT Synchronous Data Transport, Stutter Dial Tone SDTV Standard Definition TV SDU Service Data Unit SDV Switched Digital Video SE Synchronous Editing, Status Enquiry SEAD Software Encryption Algorithm for Data Services SEAS Signaling Engineering and Administration System Sec Section SEC ETSI Security Technical Committee SECAM Sequential Color with Memory SEF&I Software, Engineering, Furnished & Installed SEFL Single Ended Fault Locating SEI Supplemental Enhancement Information SEL Selector
SEP Selective Polling, Signaling End Point SEPP Secure Electronic Payment Protocol specification Seq# Sequence Number SERVNOT Service Notification SES Severe Errored Seconds, Standards Engineering Society SET Secure Electronic Transaction, Simple Endpoint Types SF Service Field, Status Field, Super-frame Format, Synchronization Flag, Single Frequency SF/MF Single Frequency/Multi-Frequency Signal SFAX Security FAX SFF Small Form Factor SFH Slow Frequency Hopping SFILE Security FILE SFNB Security Finance Network Bank SFS System File Server, Start of Frame Sequence SG Signaling Gateway, Study Group, Signal Ground SGCI Simple Gateway Control Interface SGCP Simple Gateway Control Protocol SGFS Special Group for Functional Standards SGM Segmentation SGML Standard Generalized Markup Language SGMP Simple Gateway Management/Monitoring Protocol SHARP Self-Healing Alternate Route Protection SHDSL Single-line High Speed DSL SHF Super High Frequency SHL Studio-to-Headend link SHN Self-Healing Network SHNS Self-Healing Network Service SHO Soft Handoff SHTTP Secure HTTP SI Service Indicator, Signaling Intelligence, Still Image SIB Service Independent Building Block SIC Structured Intellectual Capital SID System Identifier, Send Identifier, Silence Insertion Descriptor, System Identification SIE Status Indication Emergency SIF Signaling Information Field, Standard Interchange Format, SONET Interoperability Forum SIG SMDS Interest Group, Special Interest Group, Solution Integration Group SIGTRAN Signaling Transport SIID Service Instance ID SILS Standard for Interoperable LAN Security SIM Service Interaction Manager, Subscriber Identity Module, Set Initialization Mode SIMD Single Instruction stream, Multiple Data stream SIMM Single Inline Memory Module SIM-ME Subscriber Identity Module-Mobile Equipment
SIN Status Indication Normal SIO Scientific or Industrial Organization, Signaling/Service Information Octet SIOS Status Indication Out of Service SIP Session Initiation Protocol, SMDS Interface Protocol, SIR Interaction Pulse SIPTEL Session Initiation Profile for Internet Telephony SIR Signal to Interference Ratio, Sustained Information Rate SIT Special Information Tone SITA Society of International Aeronautical Telecommunications SIU Signaling Interface Units SJF Shortest Job First SKIP Simple Key management for IP SL Service Logic SLA Service Level Agreement SLC Subscriber Loop Carrier, Start of Layer Data SLE Screen List Editing SLEE Service Logic Execution Environment SLEL Service Logic Execution Language SLER Signal to Listener Echo Ratio SLIC Subscriber Line Integrated Circuit, Subscriber Line Interface Card SLIM Simple Legislation for the Single Market SLIP Serial Line Interface Protocol SLM Signal Level Meter, Single Longitudinal Mode SLP Service Location Protocol, Service Logic Program, Single Line Protocol, Single Link Procedures SLR Send Loudness Rating SLS Signaling Link Selection, Softlanding Linux System, Single Line Service SLTE Signaling Link Termination Equipment SLU Secondary Logical Unit, Subscriber Line Use SLVM Shared Logical Volume Manager SM Service Management, Short Message, Single Mode, Statistical Multiplexing, Security Module, Service Monitor, Security Management, Spectrum Management, Switching Module SAME Systems Management Application Entity SMAF Service Management Agent Function SMALL Short Multiplexed ALL SMAP Systems Management Application Part, Process SMAPM Systems Management Application Protocol Machine SMART Service Management Automation and Re-engineering Team SMAS Service Management System SMATV Satellite Master Antenna System SMB Server Message Block SMC System/Service Management Center, Status Manager Client SMCP Short Message Control Protocol SMD Short Message Delivery SMDB Short Message Delivery Broadcast SMDBACK Short Message Delivery Backward
SMDF Subscriber Maintenance Distributing Frame SMDFWD Short Message Delivery Forward SMDM Short Message Delivery Multipoint Bearer Service SMDR Station message detail recording SMDS Switched Multi-megabit Data Service SME Small Medium Enterprise, Short Message Entity, Signaling Message Encryption SMEKEY Short Message Encryption Key SMF Service Management Function, Single Mode Fiber SMFA Specific/System Management Functional Area SMFU System Management Functional Unit SMG Special Mobile Group SMI Structure of Management Information, System Management Information S-MIC STP Medium Interface Connector SMIP Service provider Multichannel Interface Processor SMK Shared Management Knowledge SML Service Management Layer SMLA Subscriber Line Module Analog SMLD Subscriber Line Module Digital SMM Spectrum Management Methodology SMMI Single Man Machine Interface SMORG Small and Medium business Organizations SMP Symmetric Multi-Processing, Simple Management Protocol, Service Management Point, Switching Module Processor SMPC Shared Memory Parallel Computer SMR Specialized Mobile Radio SMRP Short Message Relay Protocol SMS Short Message Service, Service/Standard Management System, Status Manager Server, Storage Management Services, Satellite Multiservice System SMSA Standard Metropolitan Statistical Area SMSC Short Message Service Center SMSCB Short Message Service Cell Broadcast SMSREQ Short Message Service Request SMTP Simple Mail Transfer Protocol, Short Message Transport Protocol SN Scaling Number, Service Node, Switching Network, Sequence Number SNA Synchronous Network Architecture, Systems Network Architecture SNA/DS SNA Distribution Services SNAP Subnetwork Access Protocol SNCC Signaling Network Control Center SNDCP Sub Network Dependent Convergence Protocol SNDR Sender SNHC Synthetic-Natural Hybrid Coding SNI Service Network Interface, Service Node Interface, SMS Notification Indicator, Subscriber-Network Interface SNM Signaling Network Management, Security Network Management SNML Sub-Network Management Layer SNMP Simple Network Management Protocol
SNP Sequence Number Packet/Protection SNR or S/N Signal-to-Noise Ratio SNRM Set Normal Response Mode SNRME Set Normal Response Mode Extended SO Serving Office SOA Semiconductor Optical Amplifier SOC System Operator Code SOCRATES System Of Cellular Radio for Traffic Efficiency and Safety SOE Standard Operating Environment SOGA SNA Open Gateway Architecture SOH Start of Header, Section Overhead SOHO Small Office/Home Office SOI Start of Image SOM Self-Organizing Multicast, System Object Model SONET Synchronous Optical Network, SDH Optical Network SONET-SDH Synchronous Optical Network-Synchronous Digital Hierarchy SOP Standard Operating Procedure SOPI Service Order Provisioning Infrastructure SOS Service Order System, Speech Option Selection SOT Send Only Terminal SP Signaling Point, Standards Proposal, Study Point, Service Provider SPA Specific Poll Address SPACH Short Message Service, Paging Channel & Access Response Channel SPAG Standards Promotion and Application Group SPAN Services & Protocols for Advanced Networks SPANS Simple Protocol for ATM Network Signaling SPARC Scalable Performance Architecture SPC Signaling Point Code, Single Parity Check, System Programming Code, Stored Program Control, Semi-Permanent Circuit SPCL Spectrum Cellular S-PCN Satellite Personal Communications Network SPCS Satellite Personal Communications Services, Stored Program Control System SPDU Session Protocol Data Unit S-PDUSupervisory PDU SPE Synchronous Payload Envelope (SONET) SPEC Standard Performance Evaluation Corporation SPF Shortest Path First SPH Service Profile at the Home location SPI Smart Plug-In, Standard Programmatic Interface, Spots Per Inch, Service Provider Interface SPID Service Profile Identifier (ISDN) SPIFF Still Picture Interchange File Format SPINASubscriber Personal Identification Number Access SPINI Subscriber Personal Identification Number Intercept SPIRIT Service Providers' Integrated Requirements for Information Technology SPL Sound Pressure Level
SPM SPNE SPOC SPOF SPP SPS
Space Switch Module Signal Processing Network Equipment Single Point of Contact Single Point Of Failure Sequenced Packet Protocol, Scalable Parallel Processors Signaling Protocols & Switching, Signaling Protocol And System Technical Committee SPTN Single Protocol Transport Network SPTT Signal Processing Transmission Terminals SPU System Processing Unit SPV Service Profile at the Visited location SPWG Service Provider-focused Working Group SPX Sequenced Packet Exchange SQ Signal Quality Detector, Scalar Quantization SQCIF Sub-QCIF SQEG Speech Quality Expert Group SQL Structured Query Language SR Source Routing SRA Seamless Rate Adaptation SRAM Static Random Access Memory SRB Source Route Bridging SRC Strategic Review Committee SRD Standards Requirements Document, Secondary Received Data SREJ Selective Reject SRES Signed Result SRF Service Resource Function, Specialized Resource Function, Specifically Routed Frames SRI SIP Relay Interface SRL Secure Radio Link, Software Release Letter, Structural Return Loss, Singing Return Loss SRM Standards Related Matters SRN Service Reference Number SRT Source Routing Transparent SR-TB Source Routing-Transparent Bridging (IEEE) SRTP Sequenced Routing Table Protocol SRTS Synchronous Residual Time Stamp SS Slice Structured, Supplementary Services, Supervisory Center, Switching System, Spread Spectrum SS5 Signaling System 5 SS6 Signaling System 6 SS7 Signaling System 7 SSA Station Select Address SSB Single Sideband SSBSC Single Sideband Suppressed Carrier SSCF Service Specific Coordination Function SSCOP Service Specific Connection Oriented Protocol
SSCP System Services Control Point SSCQE Single Stimulus Continuous Quality Evaluation SSCS Service Specific Convergence Sublayer SSD Shared Secret Data, System Status Display SSE Sum of Squared Error SSF Service Subscriber Field, Service Switching Function SSI Signal Strength Indicator, Support System Interface, Service Script Interpreter SSIP Standard Serial Interface Processor SSL Secure Socket Layer SSM Single Segment Message SSMA Spread Spectrum Multiple Access SSN Sub-System Number SSO Speech Service Option SSP Service Switching Point (SS7), Siemens Switching Processor, Switch-to-Switch Processor, Service Switching Point SSPA Solid State Power Amplifier SSPR System Selection for Preferred Roaming SSS Switching Sub-System, Self-Synchronous Scrambling SST Spread Spectrum Transmission, Synchronous Service Transport ST Segment Type, Signaling Terminal STA Spanning Tree Algorithm STACK Start Acknowledgment STAG Security Techniques Advisory Group STANAG NATO Standardization Agreement STB Set Top Box STC Sub-Technical Committee STD Simplified Trellis Decoder, Systems Technology Division, Secondary Transmitted Data STDM Statistical Time Division Multiplexer, Synchronous Time Division Multiplexing STE Secure Terminal Equipment, Section Terminal Equipment, Signaling Terminal, Signaling Terminal Equipment, Spanning-Tree Explorer STE/SB Security Terminal Equipment/Security Base STF Specialist Task Force STG Special Task Group, Special Topic Group STI Service Transport Interface STL Studio-to-Transmitter Link STM Synchronous Transmission Mode, Synchronous Transport Module STMR Sidetone Masking Rating STP Signaling Transfer Point, Spanning Tree Protocol, Shielded Twisted Pair, Services Transaction Program, Service Traffic Position STPI Services Transaction Program Interface STQ Speech Transmission Quality STRE Side-Tone Reference Equipment STS Synchronous Transport Signal (SONET) STT Secure Transaction Technology STU Secure Terminal Unit, SHDSL Transceiver Unit, Set-top Unit
STV Subscription Television STX Start of Text SU Subscriber Units SUA Stored Upstream Address SUB Sub-address SUD Single Use Device SUERM Signal Unit Error-Rate Monitor SUL Segment Unit Leader SUM Software User Manual, Software Update Manager SUMR Satellite User Mapping Register SUS Suspend SUT System Under Test SVB Switched Video Broadcast SVC Signaling/Switched Virtual Channel SVD Simultaneous Voice Data SVF Simultaneous Voice & Facsimile S-VHSSuper VHS SVI Subvector Identifier SVOICE Security VOICE SVV Sub-Vector Value SVVP Software Verification and Validation Plan SWAP Shared Wireless Access Protocol SWB Southwestern Bell SWCM Software Call Manager SWELP Switched Excited Linear Predictive SWF Switched Fractional SWG Sub-Working Group SWOT Strengths, Weaknesses, Opportunities & Threads SWSG Software Safeguarding SXS Step-by-Step SYN Synchronization Character SYNTRAN Synchronous Transmission
T T&E Technical & Engineering Committee T&M Test & Measurement T&R Tip & Ring TA Technical Assembly, Terminal Adapter, Transmit Additional information TAA Type Approval Authorities TAAB Technical Adhoc Advisory Board TAAC Telecommunications Advisory Committee TAB Tone above Band TABD Trans-Atlantic Business Dialog
TAC
Telecom Architecture Consultancy, Terminal-Aggregator Communication, Type Approval Code TACF Terminal Access Control Function TACH Traffic and Associated Channel TACS Total Access Cellular System, Total Access Communications System TAF Terminal Adaptation Function TAG Technical Advisory Group TAM Timer Active Monitor TAN Total Area Network TAP Telecommunications Application Platform, Test Access Path, Transferred Account Procedure, Two-step Approval Process TAPAC Terminal Attachment Program Advisory Committee TAPI Telephony API TARP TID Address Resolution Protocol TAS Terminal Activation Service TASI Time Assigned Speech Interpolation TAWG Terminal Attachment Working Group TAXI Transparent Asynchronous Transmitter/Receiver Interface TB Transparent Bridging, Technical Body TBB Telecommunications Bonding Backbone TBCD Telephony Binary Coded Decimal TBR Technical Basis for Registration/Regulation TBRL Terminal Balance Return Loss TC Technical Committee, Telecommunications Closet, Terminating Channel, Test Case, Transmission Convergence, Transaction Capabilities, Trellis Coded, Transmission Control, Transport Connection TCA Threshold Crossing Alert TCAMTelecommunication Conformity Assessment & Market Surveillance Committee, Telecommunications Access Method TCAP Transaction Capabilities Application Part TCB Telecommunications Certification Bodies, Trusted Computing Base TCC Telephone Coordinating Circuit, Borland Turbo C++ Compiler TC-ERM ETSI Technical Committee on EMC & Radio spectrum Matters TCH Traffic Channel, Transparent Circuit Handling TCIF Telecommunications Industry Forum TC-ISP Transaction Capabilities Intermediate Service Part TCL Transverse Conversion Loss TCLw Terminal Coupling Loss weighted TCM Tandem Connection Maintenance, Time Compression Multiplex, Trellis Coding Modulation TCM-ISDN Time Compression Multiplexed ISDN TCN Topology Change Notification, Transparent Content Negotiation TC-NA ETSI Technical Committee on Network Aspects TCOEF Transform Coefficient TCP Telecom Computer Platform, Terminal Connection Point, Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol TCPA Telephone Consumer Protection Act TC-PAM Trellis Coded Pulse Amplitude Modulation TCR-TR Technical Committee Report-Technical Report TCTL Transverse Conversion Transfer Loss TCU Telecommunications Control Unit, Trunk Coupling Unit TD Transmitted Data, Temporary Document TDB Temporary DataBase TDCC Transportation Data Coordination Committee TDD Telecommunications Devices for the Deaf, Time Division Duplexing, Task Data Descriptions TDF Transportable Document Format TDI Transport Driver Independence TDM Time Division Multiplexing, Technical Document Management TDMATime Division Multiple Access TDOA Time Difference of Arrival TDR Time Domain Reflectometer TDT Transponder Data Table TDU Topology Database Update TDX Time Delay to X TDY Time Delay to Y TE Terminal Equipment (ISDN) TE1 Terminal Equipment type 1 TEI Terminal Endpoint Identifier, Terminal Equipment/Endpoint Identity, Text Encoding Initiative TELNET Teletype over Network protocol TELR Talker Echo Loudness Rating TELRIC Total Element Long-Run Incremental Cost TEM Telecom Equipment Manufacturer, TE Management Meeting, Transverse Electro Magnetic TEMPEST Transient Electromagnetic Pulse Emanation Standard TEN Trans-European Networks TEN-Telecom Trans-European Telecommunications Networks TEP Talk Echo Protection, Telecom Equipment Provider TEQ Time Domain Equalizer TES Telecommunication Equipment Safety TETRA Trans European Trunked Radio TFIG Task Force Implementation Group TFTP Trivial File Transfer Protocol TFTS Terrestrial Flight Telephone System TG Transmission Group, Task/Trunk Group TGB Telecommunications Grounding Busbar TGS Ticket Granting Server TH Transmission Header THL Trans-Hybrid Loss THT Token Holding Timer
TI Transaction Identifier TIA Telecommunications Industry Association, Time Interval Analyzer TIB Task Information Base TIC Telecom Industry Consultant TICS Transport Information & Control Systems TID Target Identifier TIES Telecom Information Exchange Services, Time Independent Escape Sequence TIFF Tagged Image File Format TIFF-FX Tagged Image File Format-Fax TIGIN Transport Network Equipment for Interconnecting GSTN and IP Networks TILU Telecommunications Industry Liaison Unit TIM TCP/IP Inverse Multiplexing Protocol, Telecom Industry Marketing TIMS Transmission Impairment Measurement System TIN Telephone Interface Mode TINA Telecommunications Information Networking Architecture TINSDTelecom/ISP Network Service Delivery TIP Transport & Internetworking Package TIPHON Telecommunications & Internet Protocol Harmonization Over Networks TIPIA TIPHON IP telephony Implementation Agreement TIRKSTrunk Integrated Record Keeping System TIS Trusted Information Systems TISC Telecom Industry Solution Center TIWG Testing & Interoperability Working Group TL Transaction Language TL1 Transaction Language 1 TLA Three Letter Acronym TLAP TokenTalk Link Access Protocol TLB Translation Lookaside Buffer TLC Test Loop Combination TLD Top Level Domain TLDN Temporary Local Directory Number TLH Transport Layer Header TLI Transport Layer Interface TLP Test Level Point, Transmission Level Point TLS Transparent LAN Service, Transport Layer Security TLV Type Length Value TM TeleManagement, Transmission & Multiplexing, Terminal Multiplexer TMA Tower Mounted Amplifier TMC Time slot Management Channel TMF Telemanagement Forum TMGBTelecommunications Main Grounding Busbar TML Test Model for Long term TMN Telecommunications Management Network, Test Model Number TMS Time-Multiplexed Switch, Transport Management System, Truth Maintenance System, Trouble Management System TMSC Telecom Management System for Customers
TMSI Temporary Mobile Station/Subscriber Identity TMU Telecom Marketing Units TN Telephone Number, Timeslot Number, Telecommunications Network, Transit Node TNO Telecom Network Operation TNR Transmit Not Ready TNS Transit Network Selection TNT Transponder Name Table TNV Telephone Network Voltage TO Telecom Operator, Telecommunications Outlet TOA Type of Address , Time of Arrival TOC Terminated Open Circuit TOH Transport Overhead TOLR Transmit Objective Loudness Rating TON Type of Number TOP Technical and Office Protocol TOPMS Telemarketing Operation Performance Monitoring System TOPS Traffic Operator Position System ToR Terms of Reference TOS Type of Service TOSCA Text & Office Systems Content Architecture TP Test Protocol/Purpose, Transaction Processing/Program, Termination Point, Transport Protocol, Twisted Pair TPAD Terminal Packet Assembler/Disassembler TPAU Twisted Pair Attachment Unit TPC4 Transport Class 4 TPDU Transport Protocol Data Unit TPF Transmission Priority Field TPI Tip-Party Identification TPKT Transport Packet TPO Telecom Products Operation, Telecom Platform Operation TP-PMD Twisted Pair Physical Medium Dependent TPS Transport Protocol Specific TPUI Temporary Portable User Identity TR Technical Reference, Technical Report, Technical Requirements, Temporal Reference, Token Ring, Transmit Ready TR2TFTechnical Regulatory Reform Task Force TRA Traffic Routing Administration TRAC Technical Recommendation Application Committee TRAU Transcoder and Rate Adapter Unit TRIP Token Ring Interface Processor TRL Transmit Loudness Rating TRMMDS Technical Requirements MultiMedia Distribution Systems TRP Technology Reinvestment Project, Temporal Reference for Prediction TRRTF Technical Regulatory Task Force TRSS Token Ring Subsystem
TRUE Trade Requested Update process TRWNT Technical Requirements Wireline Terminals TRWST Technical Requirements Wireless Terminals TRX Transceiver (Transmitter/Receiver) TS Technical Specification, Telecom Service, Traffic Shaping TS PCR Transport Stream Program Clock Reference TSA Time Slot Assignment, Transmitting Subscriber internet Address TSACC Telecommunication Standards Advisory Council of Canada TSAG Telecommunication Standardization Advisory Group TSAP Transport Service Access Point TSAPI Telephony Service API TSAT T-1 rate Small Aperture Terminal TSB Telecommunications Standardization Board, Telecommunications Systems Bulletin TSC Telephone Switching Center, Test System Controller, Transit Switching Center TSCO Test and Measurement Services and Consulting Operation TSDU Transport Service Data Unit TSG Technical Specification Group TSGR Transport System Generic Requirements TSI Transmitting Subscriber Identification, Time Slot Interchange TSL Timeslot, Technical Scripting Language TSLRIC Total Service Long-Run Incremental Cost TSM Timer Standby Monitor, Time Switch Modular TSO Terminating Screening Office TSP Telecom Service Provider TSPS Traffic Service Position System TSR Terabit Switch Router, Terminate and Stay Resident TSS Telecommunication Standardization Sector, Truck and Signaling Subsystem, Test Suite Specification TSSC Technical Standards Subcommittee TSSI Time Slot Sequence Integrity TSSS Temporal, SNR, & Spatial Scalability TST Time-Space-Time TSTS Time-Space-Time-Space TT Translation Type, Transaction Tracker, Trouble Ticket TT&C Telemetry, Tracking and Command TTC Telecommunication Technology Committee (Japan), TIA Technical Committee TTCN Tree & Tabular Combined Notation TTD Temporary Text Delay TTE Telecommunications Terminal Equipment TTF Technical Task Force TTIB Transparent Tone in Band TTID Trouble Ticket Identifier TTL Transistor-Transistor Logic, Time to Live TTP Timed Token Protocol, Trusted Third Party TTRT Target Token-Rotation Time (FDDI)
TTS Text to Speech, Trouble Ticketing System TTT Trans-European Network Telecom, Telecom Technology Team TU Trunk Unit, Tributary Unit TUBA TCP/IP and Udp with Bigger Addresses TUG Tributary Unit Group TUP Telephone User Part (SS7) TV Television TVRO Television Receive Only TW Transmitter Window TWA Two-Way Alternate (HDLC) TWAIN Technology Without An Interesting Name, Toolkit Without An Important Name TWLT Trunk With Line Treatment TWS Two-Way Simultaneous TWT Traveling-wave Tube TWTA Traveling-wave Tube Amplifier TX Transmit
U U/L UA
Universal/Local Unbalanced Asynchronous (HDLC), Unnumbered Acknowledgement, User Agent UAC Universal Access Concentrator UADSL Universal ADSL UAN User Access Node UAP Unified Accelerated Procedure UAR Universal asynchronous receiver UART Universal Asynchronous Receiver Transmitter UAS Unavailable Seconds UAWG Universal ADSL Working Group UB Unlicensed Band UBA Unblocking Acknowledgement UBL Unblocking UBR Unspecified Bit Rate UCA Utility Communications Architecture UCAN User Circuit mode Access to Network UCF Un-registration Confirm UCS Universal Communications Standards UDC Universal Digital Channel UDF User Defined Function UDI Unrestricted Digital Information (ISDN) UDLC Universal Digital Loop Carrier UDP User Datagram Protocol
UEP Unequal Error Protection UGST User's Group on Software Tools UHF Ultra High Frequency UI Unit Interval, User Interface, Unnumbered Information UIH Unnumbered Information with Header Check UIM User Identity Module UISG Utility Industry Standards Group UITS Unacknowledged Information Transfer Service UL Underwriters Laboratory ULM Unified Management Framework ULTRIX DEC's version of UNIX UM Unified Messaging UMB Upper Memory Block UME UNI Management Entity U-MICUTP Medium Interface Connector UMTS Universal Mobile Telephony Standard, Universal Mobile Telecommunications System UMV Unrestricted Motion Vector UN Unbalanced Normal U-N User-Network UNAAUniversal Network Access Arrangement UNCTAD United Nations Conference on Trade and Development UNE Unbundled network element UNERM Unacknowledged Non-Error Recovery Mode UNI User-to-Network Interface UNICODE Universal Trunk-Out-Of-Service Code UNMA Unified Network Management Architecture UNO Unified Network Objects UP User Part, Usage Processing, Unnumbered Poll UPA User Part Available UPBO Upstream Power Back-Off UPC Usage Parameter Control UPCS (U-PCS) Unlicensed PCS UPED User Premises Equipment Division UPR Users Performance Requirements UPS Uninterruptible Power Supplies/Source/System UPT Universal Personal Telecommunications, User Part Test UQ Utility Quality URL Uniform Resource Locator, Universal Resource Locator URQ Un-registration Request US1 TDMA Wireless Speech Coder USAA United Services Automobile Association USAG United States Advisory Group USART Universal Synchronous Asynchronous Receiver Transmitter USAT Ultra Small Aperture Terminal USB Universal Serial Bus
USCEL United States Council of EMC Laboratories USHR Unidirectional Self-Healing Network USI User System Interface USNC United States National Committee USOC Universal Service Order Code USR User-to-user Information USRD User and Software Requirement Document USS US Sprint USTA United States Telephone Association USTR US Trade Representative UT Unit Test UTAMUnlicensed PCS Ad Hoc Committee for 2 GHz Microwave, Unlicensed Transition & Management UTC Coordinated Universal Time, Universal Time Code UTL Utility UTP Unshielded Twisted Pair UTRAN UMTS Radio Access Network UU or U-U User to User UUCP UNIX-UNIX Copy UUI User-User Interface UUID Universally Unique Identifier UUIE User-to-User Information Element UVLC Universal Variable Length Codeword uW Microwatt UWCC Universal Wireless Communications Consortium
V V Volt V&V Validate & Verify VAC Value-Added Carrier VAD Voice Activity Detector VADSL Very high speed ADSL VAF Voice Activity Factor VAG VRML Architecture Group VAMEVoice on ATM Multiplication Equipment VAN Value-Added Network VANC Voice Activated Network Control VANS Value Added Network Services VAP Value-Added Process VAPN Virtual Access to Private Networks VAR Value Added Resellers VAS Value Added Services VASP Value Added Service Provider
VATS Value-Added Telecommunications Service VAX Virtual Address Extension VAZO Violating All-Zero Octet VBD Voice Band Data VBI Vertical blanking interval vBNS Very High Speed Backbone Network Service VBR Variable Bit Rate VBR-NRT Variable Bit Rate-Non-Real-Time VBR-RT Variable Bit Rate-Real-Time VBSMC Variable Block-Size Motion Compensation VBV Video Buffer Verification VBW Video bandwidth VC Virtual Circuits, Video Control, Virtual Channel, Virtual Connection, Virtual Container, Volume Control VC-4 Virtual Container level 4 VCC Virtual Channel Connection (ATM) VCELS Vertical Cavity Surface Emitting Laser VCI Virtual Channel/Circuit Identifier (ATM) VCMux Virtual Channel Multiplexer VCN Virtual Channel Number VCP Value Creation Process VCS Virtual Circuit Switch, Voice Controlled Services VCSEL Vertical Cavity Surface Emitting Laser VCT Virtual Channel Table VCXO Voltage Controlled Crystal Oscillator VDC Volts DC VDI Verification & Demonstration Implementation, Verification, Design & Implementation VDP Video Datagram Protocol VDSL Very High-speed Digital Subscriber Line VDT Video DialTone, Video Display Terminal VDTI Voiceband Data Transmission Interface VEA Very Early Assignment VERA Video Error Resilience Algorithm VESA Video Electronic Standard Association VESP Video Enhanced Service Providers VF Voice Frequency VFN Vendor Feature Note VFS Virtual File System VG Voice Grade VGA Video Graphics Array/Adapter VGAnyLAN Voice Grade Any LAN VHDSL Very High bit rate Digital Subscriber Line VHE Virtual Home Environment VHF Very High Frequency VHN VESA's Home Networking
VHS Video home system VI Vector Identifier VIA Vendors ISDN Association VICS Voluntary Inter-industry Communications Standards VIM Vendor Independent Messaging VIMP Virtual Interoperability Meeting Place VINESVirtual Networking System (Banyan) VIP Versatile Interface Processor, Virtual Internet Practice, VINES Internet Protocol VIRS Vertical interval reference test signal VISTAnet Vermont Internet Services and Technology Access Network VITS Vertical interval test signal VL Vector Length vLAN Virtual LAN VLBR Very Low Bit Rate VLBVT Very Low Bit rate Video Telephony VLC Variable Length Codeword VLDB Very Large Database VLF Very Low Frequency VLM Virtual Loadable Module VLR Visitor Location Register VLRIN Visitor Location Register Identification Number VLSI Very Large Scale Integration VM Verification Model, Voice Mail, Virtual Machine/Memory vMAC Virtual MAC Address, Voice Mobile Attenuation Code VME Versa Module Europe VMLAVirtual Mobile Location Area VMM Virtual Meeting Management VMS Virtual Memory System, Voice Mail Service/System VMSC Voice Mail/Message Service Center, Visited MSC VMWIVoice Mail Waiting Indication VN Virtual Network VoADSL Voice over ADSL VOAIC Video mOSAIC VOC VDSL Operations Channel, VDSL Overhead Control VOD Video-on-Demand VoDSL Voice over DSL VoI Voice over Internet VoIP Voice Over Internet Protocol VoMSDN Voice over Multi-Service Data Networks VON Voice Over Net, Voice on Network Coalition VOP Video Object Planes VOP or Vp Velocity of Propagation VOT Televoting VP Virtual Path VPC Virtual Path Connection VPF Virtual Private Facility
VPI Virtual Path Identifier VPIM Voice Profile for Internet Mail VPM Voice Privacy Mask VPMASK Voice Privacy Mask VPN Virtual Private Network VPNS Virtual Private Network Service VPX Virtual Path Cross-connect VQ Vector Quantization VQC Vector/Voice Quantizing Code VQEG Video Quality Experts Group VQL Vector Quantizing Level, Variable Quantizing Level VR Vertical Resolution, Virtual Reality VRC Vertical Redundancy Check VRLA Valve-Regulated Lead Acis VRMLVirtual Reality Modeling/Markup Language Vrms Volts Root-Mean-Square VRU Voice Response Unit VSAMVirtual Storage Access Method VSAT Very Small Aperture Terminal VSB Vestigial Sideband VSC Vertical Service Codes VSE Virtual Storage Extended VSELP Vector Sum Excited Linear Predictive Coding VSU Video Service Unit VSWRVoltage standing wave ratio VT Virtual Terminal, Virtual Tributary signal VTAMVirtual Telecommunications Access Method VTE Virtual Terminal Environment VTOA Voice and Telephony over ATM VTP Virtual Terminal Protocol VTQME Voice Transmission Quality Mouth to Ear VTR Video Tape Recorder VTS Voice Tone Support VTU VDSL Transceiver Unit VTU-O VDSL Transceiver Unit at the Optical Network Unit VTU-R VDSL Transceiver Unit - Remote Terminal VU Volume unit VUE Visual User Environment VWC Vector Wavelet Coding VXD Virtual Device Driver VXMLVoice Mark Up Language
W
W Watt WABI Windows Application Binary Interface WACK Wait Acknowledgment WACSWireless Access Communication/Control System WAIS Wide Area Information Server WAN Wide Area Network WAP Wireless Access Protocol, Wireless Application Protocol WARC World Administrative Radio Conference WATS Wide Area Telecommunications Service WAW Wide Area Wireless WB/BB Wideband/Broadband WBEM Web Based Enterprise Management WBS Wireless Business System WC Wireless Carrier WCATWireless Cellular Action Team WCDMA Wideband Code Division Multiple Access WCPE Wireless CPE WCS Wireless Communications System WDCX Wideband and Broadband Digital Cross-connect WDM Wavelength Division Multiplexing WDS Wireless Data Service WEB-CAM Web Camera WECAWireless Ethernet Compatibility Alliance WEIAD Wireless E-911 Implementation Ad-Hoc Committee WEP Wired Equivalent Privacy WER Word Error Rate WFA Work Force Administration WFMSWork-Flow Management System WFOM Wait for Overhead Message WFQ Weighted Fair Queuing WFW Windows For Workgroups WG Working Group WGS Workgroup Systems WI Waveform Interpolation, Work Item WIDE Widely Integrated Distributed Environment WII Worldwide Information Infrastructure WILL Wireless Local Loop WIMAN Wireless MAN WIMP Windows, Icons, Mouse, and Pull-down menus WIMS Wireless Multimedia & Messaging Services WIN Wireless In-building/Intelligent Network WINForum Wireless In-building Network Forum WINS Wideband Impulsive Noise Survey, Windows Name Service, Warehouse Industry National Standards Guidelines WINTEL Windows/INTEL WISC Wireless System Controller
WLAN Wireless LAN WLL Wireless Local Loop WLNP Wireless Local Number Portability WM Wireless Manager, Workforce Management WMI Windows Management Interface WML Wireless Markup Language WMOPS Weighted MOPS WMS Workflow Management System WORM Write Once - Read Multiple WOS Wireless Office Services/Wireless Office Solutions WOSAWindows Open Services Architecture WoW Window on the World WP Working Party WPA Working Party A W-PBX Wireless PBX WPT Wireless Personal Terminal WRC World Radio-communication Conference WRE Wireless Residential Extension WSC World Standardization Conference WSF Workstation Function block WT Wireless Transceiver, Working Text WTEC Worldwide Technology Expert Center WTLR Wireless Terminal Location Registration WTO World Trade Organization WTSA World Telecommunications Standardization Assembly WTSC World Telecommunication Standardization Conference WUPE Wireless User Premises Equipment WWDC World Wide Developers Conference WWW World Wide Web
X XA Exchange Access XA-FR Exchange Access Frame Relay XAPI Extensive Application Programming Interface XAPIA X.400 API Association XA-SMDS Exchange Access Switched Multi-megabit Data Service XDF Extended Distance Feature XDR External Data Representation XDS Extended Data System xDSL x-Type Digital Subscriber Line, All the Different Digital Subscriber Line Equipment XFDN X/Open FDN XID Exchange Identification
