SDH Presentation -SDH Basics -Alcatel SDH Systems -Alcatel 1662SMC Introduction -SDH Link No.17
SDH Basics
What are SDH & PDH ?
Advantages of SDH over PDH.
SDH Data rates.
SDH Multiplexing Structure.
SDH Basic Frame Structure.
SDH Basics
What are SDH & PDH ?
Advantages of SDH over PDH.
SDH Data rates.
SDH Multiplexing Structure.
SDH Basic Frame Structure.
SYNCHRONOUS DIGITAL HIERARCH HIERARCHY Y
SDH Basi sics cs
What are SDH & PDH ? SDH stands for Synchronous Synchronous Digital Hiararchy.In SDH each and every signal is synchronized exactly to the single (container) defined for that particular signal ( like C11,C12,etc).The techniques li ke bit stuffing and bit justification are adopted in SDH to achieve the synchronization. The signal used for SDH transmission is known as Synchronous Transport Module (STM). The various STM rates are illustrated below STM-1
(155.52 Mbps)
STM-4
(622.08 Mbps)
STM-16 (2488.32 Mbps) STM-64 (9953.28 Mbps) STM-256 (39813.12 Mbps)
STM-1
STMSTM- 4
STMSTM- 16
STMSTM- 64
STM-1
STMSTM- 4
STMSTM- 16
STMSTM- 64
SDH
STM-1 MUX
STMSTM- 4
STM-1
STM- 4
SDH MUX
SDH
STMSTM- 256 256 SDH
STMSTM- 16 MUX
STMSTM- 64 MUX
STMSTM- 16
STMSTM- 64
PLESIOCHRONOUS DIGITAL HIERARCHY
PDH (Plesiochronous Digital Hier archy)
Plesio means = similar Chronous means= Timing
Plesiochronous ± ³ almost synchronous´, because the digital signals being multiplexed together are not t quite the same f requency
a
SDH Basics
What are SDH & PDH ? (continues«) PDH stands for Pleisynchronuous Digital Hiararchy.The PDH contains the signals having similar data rate signals (like E1,E 2,E3,T1,T2,etc.) but with slight timing differences as shown below. E1 ± 2.048 Mbps [32 x 64 kbps (DS0)] E2 ± 8.448 Mbps [4 x E1] E3 ± 34.368 Mbps [4 x E2] E4 ± 139.264 Mbps [4 x E3]
E1(2.047990 Mbps)
E2(8.447997 Mbps)
E3(34.367989Mbps)
E1(2.048001 Mbps)
E2(8.447989 Mbps)
E3(34.367998Mbps)
E2(8.447991 Mbps)
PDH MUX E3(34.367990Mbps)
E2(8.448000 Mbps)
E3(34.368000Mbps)
E1(2.047992 Mbps) E1(2.048000 Mps)
PDH MUX
E4(139.264000Mbps) PDH MUX
SDH Basics
Advantages of SDH over PDH
High Transmission Rates: The highest data rate that can be achieved with PDH technologies is 140 mbps, whereas the transmission rates up to 10Gbps (STM-64) can be achieved with SDH technology . Easy Add & Drop Functionality: Compared to the older PDH system, low bit rate channels can be easily extracted from and inserted into the high-speed bit streams in SDH. It is now no longer necessary to apply the complex and costly procedure of demultiplexing then remultiplexing the plesiosynchronous structure. High Availability and Capacity matching: With SDH, network providers can react quickly and easily to the requirements of their customers. For example, leased lines can be switched in a matter of minutes. The network provider can use standardized network elements (NE) that can be controlled and monitored from a central location via a telecommunications management network (TMN) system. Reliability: Modern SDH networks include various automatic back-up circuit and repair mechanisms (like Automatic Protection Switching (APS) and Equipment Protection Switching (EPS) which are designed to cope with system faults and are . monitored by management. As a result, failure of a link or a n NE does not lead to failure of the entire network
Integrated Services: SDH is the ideal platform for a wide range of services including POTS, ISDN,mobile radio, and data communications (LAN, WAN, etc.). It is also able to handle more recent services such as video on demand and digital video broadcasting via ATM.
Disadvantages of PDH Changing from one hierarchical level to another requires additional equipment. For Add/drop of individual channels from the higher order stream we have to disassemble / reassemble it Redirection (cross-connection) of channels must be done by hand on DDFs. Administrative connections require separate equipment to support Supervision, EOW and protection switching. Compatibility of transmission and administrative signals between different vendor may give trouble.
SDH Basics
SDH Data rates: STM-0
(51.84 Mbps)
STM-1
(155.52 Mbps)
STM-4
(622.08 Mbps)
STM-16 (2488.32 Mbps) STM-64 (9953.28 Mbps) STM-256 (39813.12 Mbps) Note: The STM-0 is not widely used in the telecom network except for some Microwave Links.
SDH Basics
SDH Multiplexing Structure:
STM-N
xN
AUG
x1
AU-4
VC4
C4
x3 TUG-3
TU-3
AU-3
T-3(44.736Mbps)
Or
C3
VC3
TUG-2
Virtual Containers (Containers + POH)
TU-2
VC2
C2
TU-12
VC12
C12
TU-11
VC11
C11
x3 x4
Tributary Units/Administrative Units
(Virtual Containers + Pointers) Tributary Unit
Groups/Administrative Unit Groups (Multiplexed structures of lower signals)
Alignment
Multiplexing
E-3(34.368Mbps) Or ATM(48.384Mbps)
x1 Containers
Or ATM(149.760Mbps)
VC3
x7 STM-0
E-4(139.264Mbps)
T-2(6.312Mbps)
Or ATM(6.874Mbps) E-1(2.048Mbps) Or ATM(2.144Mbps) T-1(1.544Mbps)
Or ATM(1.6Mbps)
SDH Multiplexing Structure: KLM DETAILS
K-TUG 3 L-TUG 2 M-TU 12 First KLM combination is 1 1 1 Last KLM combination is 3 7 3 Mapping of 63 E1s into STM1
E1
= 32 bytes/frame C12 = 34 bytes/frame (E1 +2 stuffed bytes) VC12 = 35 bytes/frame (C12 + 1 POH byte ) M TU12 = 36 bytes/frame (VC12 +1 pointer byte) So, one TU12 occupies 4 columns( 36 bytes) in an S TM1 frame
TUG-2
= 3 X TU12 = 12 columns /frame L K TUG-3 = 7 X TUG-2 = 86 columns /frame (7 X 12 + 2 stuffed columns are added)
VC4 = 3 X TUG-3 = 261 columns /frame (3 X TUG-3 + 2 stuffed columns + 1 P OH)
STM1 = VC4 + SOH = 261+ 9 = 270 columns /frame.
1.Container Cn, where C=Container,n=Index of the container (n=11,12,2,3,4) The r ate of the container depends on the signal which is tr ansported. 2.Virtual container VCn,It is made up of Cn and Poh Vcn=Cn+Poh,where Poh is path over head Pathover head contain Payload content 3.Tributary unit TUn=VCn+PTR n=11,12,2,3 lower oder VCn Where Pointer is an addittional r ate used to locate its Vcn with in the TU 4.Tributary unit Group TUG-k=m*TU-n, where k=2,3 n=11,12,2,3 TUG ,the Tug-2/Tug-3 can consist of sever al types of capacity payloads wit diff erent sizes. 5.Adminitr ative Unit(AU),it is made up of higher or der VCn(n=3,4) and a point AUn=VCn+PTR n=3,4 AUG=1*AU-4 or 3*AU-3
SDH Basics
SDH Basic Frame Structure (STM-1): 270 Colomns 9 10
1 1
270
RSOH (3 x 9 Cells)
3 9 Rows 4 5
AU-4 POINTER
PAYLOAD (261 x 9 Cells )
MSOH (4 x 9 Cells)
9
Each cell represents a single byte indicating a 64 kbps channel. RSOH :- Regenerator Section Overhead (27 bytes ) MSOH :± Multiplexer Section Overhead (45 bytes) Total Section Overhead (SOH) :± RSOH + MSOH AU-4 Pointer :- 9 bytes Payload :- 261 x 9 = 2349 bytes STM -1 Data rate = (270 x 9) bytes = 2430 bytes = 2430 x 64 kbps = 155520 kbps = 155.52 Mbps
SDH Basics
SDH Basic Frame Structure (STM-1) (Continues«.):
Section Overhead (SOH )
A1
A1
A1
A2
A2
A2
J0
B1
*
*
E1
*
F1
D1
*
*
D2
*
D3
X
X
X
X
AU-4 Pointer B2
B2
B2
K1
K2
D4
D5
D6
D7
D8
D9
D10
D11
D12
S1
X ± Bytes Reserved for national use.
* - Media Dependant Bytes
M1
E2
SDH Basics
SDH Basic Frame Structure (STM-1) (Continues«.): Overhead Bytes Functions
Overhead Byte
Functions
A1,A2
Fr ame Alignment
B1,B2
Quality Monitoring , parity bytes
D1,D2,D3
Qecc Networ k Management
D4,«««..,D12
Qecc Networ k Management
E1,E2
Voice Connections
F1
Maintenance
J0
Tr ace Identif ier
K1,K2
Automatic Protection Switching (APS) Control
S1
Clock Quality Indicator
M1
Tr ansmission Error Acknowledgement
Alcatel SDH Systems Alcatel SDH Systems
1662SMC
1660SM
1642
Version 1(R1)
Version 2(R2)
Supports Upto STM-4
Supports Upto STM-16
Supports Upto STM-1
Version 4(R4)
Supports Upto STM-16
Version 5(R5)
Supports Upto STM-64
Alcatel 1662 SMC Introduction
Features
Shelf View
Commonly used cards
Technical Specifications
Alcatel 1662 SMC Introduction Features:
It complies with the Synchronous Digital Hierarchy (SDH) defined in ITU-T Recommendation G.707.
Compatible with existing plesiochronous systems as well as with the installed SDH networks,
The 1662SMC is transmission equipment operating at 155.520 Mbit/s (STM-1) , 622.080 Mbit/s (STM-4) and 2488.320 Mbit/s(STM-16).
It can be configured as a Multiple Line Terminal Multiplexers or as a Add/Drop Multiplexers or as a Mini local cross-connect for applications in linear links, network rings and meshed networks.
Equipment (EPS) and network (MSP) protection mechanism
Matrix capacity 96*96 stm-1 equivalent matrix(HO) 64*64 stm-1 equivalent matrix(LO) Network interfaces: Stm-1/4/16 Customer interfaces: 2Mbps,34/45Mbps,140Mbps,ethernet,gigaethernet
ALCATEL SDH LINK-17 PONDY TO TRICHY: STM 4 LINK
26km
50km
49km
PONDICHERRY
CUDDALORE
TANJORE
TRICHY 54km
65km
CHIDAMBARAM
KUMBAKONAM
Total Pondy ± Trichy
: 244 KMS
Fiber Owner
: BTSOL
Fiber allotted f or vsnl /Ttsl : F no 39 ± F no 48 Fiber used f or SDH
: F no 43&44
Link name & no
: SDH LINK No 17
Alcatel 1662 SMC Introduction
Shelf View:
ACCESS AREA-1
PORT AREA
ACCESSAREA-2
- Total Slots : 20 - Access Area 1: Slot 1-5 ( Hosts Access Cards like A63E1, A4S1, Congi ,etc). - Access Area 2: Slot 16-20 ( Hosts Access Cards like A63E1, A4S1, Sergi ,etc). - Port(Basic area)Area: Slot 6-15 (Hosts Port Cards like SYNTH, P4S1, P63E1, etc).
CARDS USED IN THE ALCATEL SDH LINK-17
1. Congi card : It the used to control the whole SDH system. It consists of power supply&house keeping unit. the congi card is in slot no1 2. Synth4Card: It is card used to insert the optical signals from the fms.It consists the Optical module it is named as IL- 4.2,IL-1.2,IS1.1.- these are called Optical modules. There are two synth cards its inserted in slot no 6&15. 3.
P4S1N card: P indicates Port ,S1N indicates STM1. card
4. P63E1 card : P indicates port, 63 E1 indcates Electical signals. 5. A63E1-120 : it¶s a card corresponding to P63E1 card.A indicates access area. 6. LSPORT/HSPROT: Its is a Low Speed/High speed protection Card. It is used to implement EPS protection.(i.e)it implements the connection between the access and spare card.These cards receive the signal coming from the access card via back panel.
7.SERGI CARD: Used as a stand by card for the CONGI CARD 8. IL- It indicates LONG HAL it should in corresponding SYNTH CARD. 9. IS- It indicates SHORT HAL . Note: 1. For All cards corresponding stand by cards are used. 2. Inserting a port card we have to insert a corresponding acess card in the particular slot. : Corresponding Acess area 3. Port area Slot No-7 : No-2 Slot No-8 : No-3 Slot No-9 : No-4 Slot No-10 : No-5 Slot No-11 : No-16 Slot No-12 : No-17 Slot No-13 : No-18 Slot No-14 : No-19 4. Congi card in Slot no- 1 5. Sergi card in Slot no-20 6. Synth card in slot no:6,15
Alcatel 1662 SMC Introduction
Commonly Used Cards: ACRONYM
SLOTS
P63E1N
7,8,9,10,11,12,1 3,14
P4ES1N
7,8,9,10,11,12,1 3,14
P3E3T3
7,8,9,10,11,12,1 3,14
P63E1 processes 63 2Mbits/s signals whose accesses are on the relevant Access cards A21E1,A63E1
P4ES1N handles four electrical STM-1 Signals.All four accesses are on the relevant access card(A4ES1).It is one of the board that can be EPS protected.
P3E3T3 Prt card is a bi-directional interface from/to three PDH streams at 34Mbits/s or at 45Mbits/s Switchable and the STM-4
(1) Multicolor LED: Red led . local unit alarm Green led . in service unit Or ange led . unit in stand-by (EPS schema)
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): ACRONYM
SLOTS
P4ES1N
7,8,9,10,11,12,13,14
P4E4N
7,8,9,10,11,12,13,14
P4ES1N handles four electrical STM-1 signals.All the four accesses are on the Relevant Access card(A4ES1).It can be EPS protected.
P4E4N it describes the same features of P4S1N. Two STM-1 electrical modules(Electricl or optical )can be hosted on the board. Two further STM-1 modules can be hosted on the Access card A2S1
LEGEND: (1) Channel #1 (N.B.) (2) Channel #2 (N.B.) (3) Bicolor LED: Red led . local unit alarm Green led . in service unit
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..):
ACRONYM
SLOTS
CONGI
1, 20
1662SM-C houses two congi card(i.e)congi-A and congi-B
CONGI-A hold the Equip MAC(media access control) address
LEGEND:
(1) Power (2) Housekeeping and remote alarm (3) Rack lamp (not used in slot 20) (4) QMD Q2 (not used in slot 20) (5) I/O BNC Q3 10base2 (not used in slot 20) (6) RJ45 Q3 10baseT (not used in slot 20) (7) Bicolor LED: Red led . local unit alarm Green led . in service unit
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..):
ACRONYM
SLOTS
SERGI
20
Sergi car d Provides reduced combination of congi and service car d f unctions It has Power inter f ace,Auxillary inter f ace,I/p o /p clock inter f ace f or NE synchronization
LEGEND: (1) Power (2) Auxiliary channels: 2 channels G.703 2 channels RS232 2 channels V.11 (3) Aux and Sync. 2Mbit /s J1 . 2MHz Input (T3) or 2Mbit /s Input (T6) J2 . 2Mbit /s Input channel J3 . 2MHz output (T4) or 2Mbit /s output (T5) J4 . 2Mbit /s output channel (4) Four wire telephone extersion point (RJ11) (5) Z1-Z4 EOW zone selection LEDs (N.B.1) (6) L1-L2 LEDs status f or selective and multiple call (N.B.2) (7) Telephone jack (8) Line seizure Key (9) EOW zone selection Key (10) Reset command Key (11) Bicolor LED: Red led . local unit alarm Green led . in service unit
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): ACRONYM
SLOTS
SYNTH16
6,15
SYNTH16 can be EPS 1+1 Protected Slot no:6 is main card Slot no:15 is spare card Synth16 card is equipped with two parts for modules 1*STM-16 signals can be processed by the SYNTH 16 card Synth 16 card performs several fns like shelf controller,Equip controller, Performance monitoring collection,remote inventory Synth 16 cards have a 96*96 stm-1 Matrix capacity. It is also called as Compact ADM16 Card
LEGEND (1) Reset command key (2) Channel #1 (N.B.) (3) Lamp test pushbutton (4) Personal Computer Connector (F inter fa ce) (5) Red LED . Urgent Alarm (Critical or Ma jor) (6) Red LED . Not Urgent Alarm (Minor) (7) Yellow LED . Alarm storing (Attended) (8) Yellow LED . Abnormal condition (9) Yellow LED . Indicative Alarm (Warning) (10) Green LED . when on it means active unit when off it means standby unit (11) Bicolor LED: Red led . local unit alarm (INT) Green led . in service unit (12) Alarm storing pushbutton (Attended)
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): ACRONYM
SLOTS
A63E1B (120Ohm)
2,3,4,5,16,17,18,19
A63E1 is the access card for the P6 3E1 63*2Mbit/s Access card(A63E1)Provides the connections from backpanel to the external line and vice versa for the 6 3 PDH signals.
Three
different type of connectors available:
A63E1/A:75 ohms unbalanced A63E1/B:120 ohms balanced A63E1/C:75 Ohms unbalanced with coax( 3 slot wide) LEGEND (1) Channel #1-7 (2) Channel #8-14 (3) Channel #15-21 (4) Channel #22-28 (5) Channel #29- 35 (6) Channel #36-42 (7) Channel #43-49 (8) Channel #50-56 (9) Channel #57-63
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): ACRONYM
SLOTS A2S1
3,4,5,16,17,18,19 2,
A2S1 is the access card for the P4S1N and P4E4N port cards.
A2S1 can host upto 2modules(optical stm-1) in the front panel.
LEGEND
(1) Channel #3 (N.B.) (2) Channel #4 (N.B.) (3) Bicolor LED: Red led . local unit alarm Green led . in service unit
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): ACRONYM
SLOTS
A3E3
2,3,4,5,16,17,18,19
A3T3
2,3,4,5,16,17,18,19
A3E3 Provides 3*34Mbit /s accesses f or the P3E3T3
A3T3 Provides 3*45Mbit /s accesses f or the P3E3T3
For each P3E3T3 One A3E3,A3T3 is necess ary
LEGEND
(1) Channel #1 (2) Channel #2 (3) Channel #3 (4) Bicolor LED: Red led . local unit alarm Green led . in service unit
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): ACRONYM
SLOTS
A4ES1
2,3,4,5,16,17,18,19
A4ES1 Provides 4 STM-1 Accesses f or the P4ES1N.
For each P4ES1N one A4ES1 is Necessary
LEGENDA
(1) Channel #1 (2) Channel #2 (3) Channel #3 (4) Channel #4 (5) Bicolor LED: Red led . local unit alarm Green led . in service unit
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..): MODULE ACRONYM S-1.1 L-1.1 L-1.2
EQUIPED ON
PORTS
P4S1N,P4ES1 ATM4X4,A2S1 SYNTH4
S-1.1 S-Stands f or short haul 1-stands f or stm-1 1-stands f or representing 1310nm L-1.1 L-Stands f or Long haul 1-stands f or stm-1 1-stands f or representing 1310nm Module types: Stm-1 and stm-4 Optical module:SC-PC Type and Fc-Pc Type are available Stm-1 & stm-4 Optical modules are available and it physically diff erent 140Mbit /s-STM-1 Electrical module.
Alcatel 1662 SMC Introduction
Commonly Used Cards ( continues..):
LEGENDA (1) Multicolor LED: Red led . local unit alarm Orange led . temperature major than 55° C Green led . in service unit (2) Battery A connector (3) Battery B connector (4) Alarms connector for 1662SMC on the Left side of the Rack (5) Not used (6) Alarms connector for 1662SMC on the Right side of the Rack (6)
PSC f ront view
HWF + VBATT (male)
GND (f emale)
POWER
-VBATT (male)
Alcatel 1662 SMC Introduction
Technical Specifications:
Safty FirstThe optical inter fa ces which have HAZARD LEVEL 3A (see Table A below ) carry the f ollowing hazar d symbol label:
Caution : Invisible Laser Radiation may be present inside the optical inter fa ces carrying the above label ,hence NEVER directly view into the beam.Doing so may result in the permanent damage to the eyesight. UNIT/PORT
OPTICAL INTERFACE
HAZARD LEVEL
STM.1
S.1.1 (short haul)
1
STM.1
L.1.1 (long haul)
STM.1
L.1.2 (long haul)
STM.4
S.4.1 (short haul)
1
STM.4
L.4.1 (long haul)
3 A
STM.4
L.4.2 (long haul)
STM.16
S.4.1 (short haul)
STM.16
L.4.1 (long haul)
STM.16
L.4.2 (long haul)
3 A 3 A
3 A 3 A 3 A 3 A
CLASSIFICATION OF ALARMS
SEVERITY ALARMS SYNTHESIS 1.Critical Alarms 2.Ma jor Alarms 3.Minor Alarms 4.Warning Alarms 5.Intermediate Alarms DOMAIN ALARMS SYNTHESIS 1.Synchronization Alarms 2.External points(House keeping Alarms) 3.Tr ansmission Alarms 4.Equipment Alarms MANAGEMENT ALARMS SYNTHESIS 1.Supervision 2.Alignment 3.Local access 4.Oper ating system 5.Managed by Nm & RM 6.Abnormal condition
Power -48V DC, 6A
MCB Rating used in the TRU unit is 16A
The max current consumed by the Equipment is less than 4Amps
A/C environment with temper ature, humidity and dust control
Fire saf ety by centr alised monitoring and automatic oper ation of extinguisher
LCT access through Q inter f ace f or NMS access through the LAN car d
Tools: Power source, power meter, OTDR (Optical Time Domain Ref lectometer) and OSA (Optic al Spectrum Analyser)
Alcatel 1662 SMC Introduction
Technical Specifications (Continues«):
Electrical Interface CharacteristicsInterface
Charaterisitics
P63E1
Bit rate
2048 Kbit/s ±50 ppm
No. of channels
63
Line Code
HDB3
Signal amplitude
2.37 Vp on 75 Ohm unbalance/ 3 Vp on 120 Ohm balance.
P3E3
P3T3
Bit Rate
34368
No. of tributaries
3
Line Code
HDB3
Signal amplitude
1Vp/75ohms
Bit rate
44.736 Kbit/s ± 20ppm
No. of tributaries
3
Line Code P4S1E
P4E4
Kbit/s ±20 ppm
B3ZS
Bit rate
155 520 Kbit/s ± 20 ppm
Line Code
CMI
Bit rate
139264 Kbit/s ±15 ppm
Line Code
CMI
Alcatel 1662 SMC Introduction
Technical Specifications (Continues«):
Optical Characteristics ± STM-1
L 1.1
L 1.2
-15 to - 8dB
0 to - 5dB
0 to 5dB
Receiver Sensitivity
-28dB
-37dB
-37dB
Receiver Overload
-8dB
-10dB
-10dB
S 4.1
L 4.1
L 4.2
-15 to -8dB
2 to -3dB
2 to 3dB
Receiver Sensitivity
-28dB
-28dB
-28dB
Receiver Overload
-8dB
-8dB
-8dB
S 16.1
L 16.1
L 16.2
0 to -5dB
2 to -2dB
2 to 2dB
-18dB
-27dB
-28dB
0dB
-8dB
-8dB
Tr ans Power
Optical
Connectors STM-4
Tr ans Power
Optical
Connectors
STM-16 Tr ans Power Receiver Sensitivity Receiver Overload
S 1.1
FCPC/SCPC
FCPC/SCPC
RS232 Pin Assignments (DB9 PC signal set) Pin 1
Received Line Signal Detector (Data Carrier Detect)
Pin 2 Received Data Pin 3
Transmit
Data
Pin 4 Data Terminal Ready Pin 5 Signal Ground Pin 6 Data Set Ready Pin 7 Request To Send Pin 8 Clear To Send Pin 9 Ring Indicator The connector on the PC has male pins, therefore the mating cable needs to terminate in a DB9/F (Female pin) connector
PROTECTION TYPES
EPS Equipment Protection Switching
1:1 1:N
EPS:Protection against the equipment failure
MSP Multiplex Section Protection
MSP-LINEAR MS-SP RING SNCP /N SNCP /I
MSP:Protection against the equipment failure And the Line Failure
EPS(Equipment Protection Switching) 1+1 Type EQUIPMENT
1
EQUIPMENT
2
1.The 1+1 EPS Protection type means that one wor king equip is Protected by One Redundant Equip 2.The mode of 1+1 EPS Protection is Non Revertive.
EPS(Equipment Protection Switching) 1:N Type LINE 1
LINE 2
LINE N
EQUIPMENT
1
EQUIPMENT
1
EQUIPMENT
N
EQUIPMENT
P
1)1:N Type protection means that N working Pieces of equip are protected by just 1 Portecting Equivalent. 2)The mode of 1:N Eps protection is revertive.
MSP(Multiplex Section Protection) MSP(linear) is also called as APS(Automatic Protection Switching) NE-A NE-B WORKING
1+1Protection
TX PROTECTION
HIGH PRIORITY LINE WORKING
TX LOW PRIORITY LINE WORKING
TX
TX
1:1Protection
RX RX
WORKING WORKING
TX
RX
PROTECTION
RX RX 1:N Protection
