Oct. 25 2007
Internal Use (Only)
HUAWEI BSC6000 HUAWEI Hardware Structure and System Description www.huawei.com
ISSUE 3.0 GSM BSS Training Team
HUAWEI TECHNOLOGIES TECHNOLOGIES Co., Ltd.
HUAWEI HUAWEI Confidential
This course describes the hardware structure of the HUAWEI BSC6000 system, board module functions, system operating principles, system signal flows, and O&M flows. In addition, this
course describes the principles of hardware configuration and lists some typical configurations.
Reference HUAWEI BSC6000 Hardware Reference HUAWEI BSC6000 System Description HUAWEI BSC6000 Architecture and Principles
Purpose
After learning this course, you should understand the following contents: HUAWEI BSC6000 function and features HUAWEI BSC6000 hardware structure HUAWEI BSC6000 system principle HUAWEI BSC6000 typical configuration
Chapter 1 System Description Chapter 2 Hardware Structure Chapter 3 Working Principle Chapter 4 Typical Configuration Configura tion
Location of the BSC6000 in the GSM Network The HUAWEI BSC6000 is a new generation GSM BSC product after the HUAWEI
BSC32.
HLR
MSC
MS BTS
BSC
A
MS Pb BTS
Gs PCU SGSN
MS
Gb
BTS MS
UM
Abis
GGSN
Features of the BSC6000 System Large capacity, high integration Supporting at most 2048TRX; Maximum of traffic: 12,000 Erl; BHCA : 2,340,000; Full-configuration subscriber: 600 000 In case of using the E1 interface board, a maximum of the system is four
racks In case of using the STM-1 interface board, a maximum of the system is
three racks Flexible configuration Supporting multiple types of networking between BSCs and BTSs Flex Abis Service-oriented hardware configuration Multiple clock sources
Features of the BSC6000 System Comprehensive functions; advanced management algorithm for radio resource The service functions is categorized into basic functions and optional functions. To protect
investment, the customer choose proper functions that are applied to a specified network function and capacity. HW_II Power Control Algorithm HW_II Handover Algorithm: supporting about 10 handover algorithms, such as hierarchical
handover, layer handover, and PBGT handover Multiple radio resource allocation technology and flexible radio channel switch mechanism Support internal GOMU board Support local exchange and MML function Practical O& M functions Friendly GUI Flexible network parameter configuration Remote maintenance Abundant Online Help
Features of the BSC6000 System Smooth capacity expansion and upgrade Supporting smooth, in-service capacity expansion Supporting in-service patching Strong performance, advanced design Supporting 2M signaling link Supporting local multiple signaling points Supporting TC resource pool Supporting full-index report performance statistics
Summary
Summary
This chapter describes the following contents: Design mentality of the HUAWEI BSC6000 system system • System specifications • Functions and Features •
Chapter 1 System Description Chapter 2 Hardware Structure Chapter 3 Working Principle Chapter 4 Typical Configuration Configur ation
Chapter 2 Hardware Structure
Rack and Subrack
Board
Abbreviation
Abbreviation
Full Name
GBCR
GSM BSC Control Processing Rack
GBSR
GSM BSC Service Processing Rack
GBAM
GSM Back Administration Module
GEPS
GSM Extended Processing Subrack
GMPS
GSM Main Processing Subrack
GTCS
GSM TransCoder Subrack
GIMS
GSM Integrated Management System
Structure of Rack Model: The BSC6000 uses HUAWEI N68-22 rack. The rack design
complies with the IEC60297 and IEEE standards.
Structure Dimension: 600mm (width) x800mm (depth) x 2200mm (height) Weight: Empty rack ≤ 150kg; full configuration ≤350kg
Type
The BSC6000 rack is categorized into two types: GBCR: GSM BSC Control Processing Rack GBSR: GSM BSC Service Processing Rack
Rack—— GBCR
Power distribution box
GBCR (GSM BSC Control Processing Rack ): It must be configured with main processing subrack and GBAM server. It processes the
Subrack
BSC6000 services and performs operations and maintenance.
In the GBCR, a GIMS and at most two
Cabling subrack
subracks can be configured .
Air defence subrack
GIMS: GSM Integrated Management System consists of the following components:
One KVM (keyboard, video and mouse)
One LAN Switch
One GBAM (GSM Back Administration
Subrack
Module) server KVM
Dummy panel LAN Switch GBAM
Rack ——GBSR GBSR (GSM BSC Service Processing Rack ): It is
only configured with subracks. It performs service
Power distribution box
processing functions of the BSC6000. One service rack can be configured with three
subracks. According to the requirement of service quantity,
each BSC6000 system contains a maximum of three
Air defence subrack
service racks. subrack 插框
Air defence subrack
Dummy panel
Subrack Subrack: The subrack complies with the
IEC60297 standard. The width of it is 19 inches.
Fan box
A backplane is in the middle of the subrack, and Board
boards are inserted from the front and the rear of the subrack. Both the front subrack and the rear subrack provide 14 slots. The slots are numbered 00 –27 from the front to the rear.
Cabling Trough 14
The BSC6000 contains three subracks: GMPS main processing subrack
20
27
后插单板
Interface board
GEPS extension processing subrack GTCS voice processing subrack
Mother board
背板
前插单板 00
06
13
Service board
Subrack——GMPS GMPS: It performs the basic service processing and operation maintenance functions. In addition,
it provides system clock. The GMPS is configured in the GBCR. Compared with the GEPS subrack, the GMPS also is configured with the GGCU board. It can process the services of a maximum of 512 TRXs in full configuration.
Configuration Configur ation Type A
Configuration Type B
Subrack——GEPS GEPS: It performs basic service processing function of the BSC6000. Each BSC6000 has 0 –3
GEPS that can be configured in the GBCR or GBSR. It can process the services of a maximum of 512 TRXs in full configuration.
Subrack——GTCS TransCoder Subrack ) performs transcoding, rate adaptation and sub GTCS: A GTCS (GSM TransCoder multiplexing. When the BSC6000 uses E1 transmissions on the A interface, a GTCS provides a maximum of
3,840 speech channels. interface, a GTCS provides a maximum of When the BSC6000 uses STM-1 transmissions on the A interface, 7,680 speech channels.
GTNU slot 4～5 GSCU slot 6～7 GDPUC slot 8～ 13&0～3 GEIUT slot 14～17 GEIUA slot 18～27
Dip switch of Subracks The switch state ―ON‖ means 0 and
OFF‖
Bit
Meaning
1
Subrack number control bit
2
Subrack number control bit
3
Subrack number control bit
4
Subrack number control bit
eight DIP bits, the quantity of ―1‖ must be
5
Subrack number control bit
odd.
6
Odd parity check bit
7
It is undefined, and is generally set as ―0‖.
8
The automatic DIP bit of the GSCU board in the central subrack is: 0, the starting of boards is highly dependent on the GBAM server, namely that the boards load from the server after starting. 1, the starting of boards is less dependent on the GBAM server, namely that the boards check the validity of the Flash file when w hen starting, and load from the Flash file if the Flash file is valid or load from the server if the Flash file is invalid.
means 1. The highest bit of DIP corresponds with the highest bit of the byte. The odd parity check is used for DIP. In the
Use the following method to set: First set the
DIP bit 1 –5 and 8. DIP bit 7 is generally ―0‖. Then count the quantity of ―1‖ in the current
DIP bits. If the quantity is even, set DIP bit 6 as ―1‖. If the quantity is odd, set DIP bit 6 as
―0‖. 1 ON
8
Power Distribution Box The power distribution box has the following configurations: Checking two channels of - 48 V input voltage Detecting one route of external temperature sensor; detecting one route of external humidity
sensor; detecting two lightning protection components; detecting the status of six distributedpower output switches Emitting audio and visual alarms Communicating with the GSCU and reporting the status of the power distribution box and
exchanging O&M information with the GSCU
Fan Box The PFPU board and the PFCU board are configured in the fan box. The PFPU is inserted in the rear part of the fan box. It provides power supply for nine fans, keeps
the voltage stable through a stabilizing tube, and ensures normal operations of the fans. The PFCU is inserted in the front part of the fan box. It has the following functions: Monitoring the running status of the fans in the fan box Communicating with the GSCU and reporting the working status of the fan box Detecting the temperature of the fan box, collecting temperature data with a temperature sensor Showing the current status of fan box
and providing alarms through LED
KVM The KVM is a device integrating a keyboard, a
display, and a mouse. It is the operating platform of the GBAM.
Port for mouse cable Power switch
DC input power socket
Port for display cable
Port for keyboard cable
GBAM The GBAM is a server installed with OMU software, which is used to perform operation and
maintenance for the BSC6000. It has the following functions: Controlling the communications between the LMT and boards, supporting data configuration
for boards through the LMT; collecting and filtering performance and alarm data Responding to the commands from the LMT, processing the commands, and then forwarding
the commands to the boards in the BSC6000 Filtering the results from boards and then returning the results to the LMT
Front of GBAM
Rear of GBAM
Chapter 2 Hardware Structure
Rack and Subrack
Board
Abbreviation Abbreviation
Full name
GGCU
GSM General Clock Unit
GSCU
GSM Switching and Control Unit
G0MU
GOMU (GSM Operation and Maintenance Unit)
GTNU
GSM TDM Switching Unit
GXPUT
GSM extensible Processing Unit for Transmission
GXPUM
GSM extensible Processing Unit for Main service
GDPUC
GSM Data Processing Unit for CS service
GEIUA
GSM E1/T1 Interface Unit for A
GEIUB
GSM E1/T1 Interface Unit for Abis
GEIUP
GSM E1/T1 Interface Unit for Pb
GEIUT
GSM E1/T1 Interface Unit for Ater
GOIUA
GSM Optic Interface Unit for A
GOIUB
GSM Optic Interface Unit for Abis
GOIUP
GSM Optic Interface Unit for Pb
GOIUT
GSM Optic Interface Unit for Ater
Board——GGCU The GGCU is the general clock unit in the BSC6000. The active GGCU and GGCU
RUN ALM ACT
the standby GGCU are configured in slots 12 and 13 in the GMPS. The GGCU board provides synchronous timing signals for the system The GGCU has the following functions: Generating and keeping synchronous clock signals
ATN-IN
Keeping the consistency of synchronization information output from the
0 1
active and standby GGCUs
2 3
4
T U O K L C
Matching Port
Function Connector
5 6 7
CLKOUT0～9
Synchronization signal output port, used to
RJ45
output 8 kHz clock signals to the GSCU 8 9
COM0～1
Standby
RJ45
TESTOUT
Standby
SMB male connector
TESTIN
Standby
SMB male connector
CLKIN0～1
Synchronization clock signal input port, used to
SMB male connector
COM0 COM1
T U O T S N I E T T S
E T 0 N I L 1 K L N I C L K L C
PARC
input one route of external 2.048 MHz signal and 2.048 Mbit/s code stream signals
Board——GSCU SCUa
The GSCU is the switching control unit in the BSC6000. The active GSCU and
the standby GSCU are inserted in slots 6 and 7 of the GMPS/GEPS/GTCS. GMPS/GEPS/GTCS. The RUN
GSCU board provides maintenance management of the subrack and GE
ALM ACT
switching platform for the subrack.
RESET LINK ACT
0
The GSCU has the following functions: Performing maintenance management of the subrack
1
2
Providing a GE platform for the subrack
3
Providing clock information for the other boards in the same subrack
LINK LINK ACT
4
except the GGCU
T E S A B 0 0 0 1 / 0 0 1 / 0 1
5
6
7 LINK ACT
8
9
EHT0～9
10 11
Function
Matching
10M/100M/1000M Ethernet ports, used to connect subracks
RJ45
10M/100M/1000M Ethernet ports, used to connect GBAM
RJ45
Port
EHT10
11
～
(Only the main subrack is connected with the GBAM)
M O C
N I K L C
TESTOUT TESTOUT
PARC
COM CLKIN TESTOUT
Debugging port Clock source port, used to receive the 8 kHz clock signals
RJ45 RJ45
from the panel of the GGCU Clock test signal port, used to output clock test signals
SMB connector
Board ——GTNU The GTNU is the TDM switching unit in the BSC6000. The active GTNU and the
GTNU
standby GTNU are inserted in slots 4 and slot 5 of the GMPS/GEPS/GTCS. The GTNU board performs the TDM switching function, which is the TDM switching
RUN ALM ACT
center of the system. The GTNU has the following functions:
0 M N T
Providing 128 K 128 K TDM switching Allocating TDM network resources, establishing, and releasing radio links
1 M N T
2 M N T
e n a l p t n o r F
3 M N T
4 M N T
LVDS 6
TDM switching LVDS module 24 128K*128K
e n a l p r a e R
5 M N T
Port
PARC
TDM0～5
Function
TDM high-speed serial port, used to connect the GTNUs between subracks
Matching connector
DB14
Board——GXPUM BS C6000. The active The GXPUM is the main service processing unit in the BSC6000.
GXPU
RUN ALM ACT
GXPUM and the standby GXPUM are inserted in slots 0 and 1 of the GMPS or GEPS. One GXPUM has four built-in CPUs that perform central service processing function. The GXPUM has the following functions:
Paging control System information management Channel assignment BTS common service management
LINK ACT
Voice call control Packet service control Handover Power control
0 T E
1 S
A B 0 0 0 1 / 0 0 1 / 0 1
2 3
Port
PARC
10/100/1000BASE-T0～3
Function GE/FE Ethernet port, reserved
Matching connector RJ45
Board——GXPUT The GXPUT is the transmission processing unit in the BSC6000. The
GXPU
active GXPUT and standby GXPUT are inserted in slots 2 and slot 3 in RUN ALM ACT
the GMPS or GEPS. The GXPUT performs the short message cell broadcast and LAPD links processing processing function of the system. The GXPUT has the following functions: Cpu0 process Cell Broadcast Function and cpu1~3 process LAPD
protocol in GMPS Cpu0~3 process LAPD protocol in GEPS
LINK ACT
0 T E
1 S
2
A B 0 0 0 1 / 0 0 1 / 0 1
3
Port
10/100/1000BASE-T0～3 PARC
Function GE/FE Ethernet port, reserved
Matching connector RJ45
Board ——GEIU / GOIU The GEIU / GOIU can be categorized into the following types : GEIU
RUN ALM ACT
GOIU
The GEIUB/GOIUB is the GSM E1/T1 Interface Unit for the Abis interface. The GEIUP/GOIUP is the GSM E1/T1 Interface Unit for the Pb interface.
RUN ALM ACT
The GEIUT/GOIUT is the GSM E1/T1 Interface Unit for the Ater interface. The GEIUA/GOIUA is the GSM E1/T1 Interface Unit for the A interface. interface.
TX RX
The GEIU/GOIU has the following functions: Processing the SS7 MTP2 protocols
E1/T1(24~31)
Processing the Link Access Procedure on the D channel (LAPD) protocols
LOS
Providing maintenance links when GTCS subracks are configured at the E1/T1(16~23)
MSC side Performing inter-board Tributary Tributary Protect Switching (TPS)
E1/T1(8~15)
Interface
E1/T1(0~7)
0 M 2
0 M 2
1 M 2 T U O T S E T
1 M 2 T U O T S E T
PARC
Function
E1/T1(0～
E1/T1 port, used to transmit and receive E1/T1 signals on
31)
routes 0 –7
2M0～1
PARC
TESTOUT
Matching connector DB44
2.048 MHz clock source output port, used to output the
SMB male
extracted line clock as the system clock source
connector
2.048 MHz clock output port, used to output the testing
SMB male
clock of the system
connector
Board——GEIU The DIP switches switches of the GEIU board is set through through the 75-ohm coaxial cable transmission mode. Reset
the DIP switches of the GEIU board if onsite engineers adopt other transmission modes.
DIP Bit switch
Description
75Ω
120Ω
S1
1
Used to select the impedance on E1/T1 links 0 –7
ON
OFF
2
Used to select the impedance on E1/T1 links 8 –15
ON
OFF
3
Used to select the impedance on E1/T1 links 16 –23
ON
OFF
4
Used to select the impedance on E1/T1 links 24 –31
ON
OFF
5～8
Unused
ON
OFF
S3
1～8
Used to set the protection grounding of the transmitting end of E1/T1 links 0 –7
ON
OFF
S4
1～8
Used to set the protection grounding of the transmitting end of E1/T1 links 8 –15
ON
OFF
S5
1～8
Used to set the protection grounding of the transmitting end of E1/T1 links 16 –23
ON
OFF
S6
1～8
Used to set the protection grounding of the transmitting end of E1/T1 links 24 –31
ON
OFF
Board——GDPUC DPUa
The GDPUC is the circuit service processing unit in the BSC6000. The RUN ALM
GDPUC board can be inserted in slot 0 to slot 3, slot 8 to slot 13 of the
ACT
GTCS subrack. The board performs the voice and data service processing functions. It works in resource pool mode. The GDPUC has the following functions: Encoding and decoding speech services Performing data service rate adaptation Performing Tandem Free Operation (TFO) Performing voice enhancement function Automatically detecting voice faults
PARC
Board——GOMU As the OM center of the BSC, The GOMUs are installed in slots 20 –23 in the GMPS and work in active/standby mode. The GOMU features high computation speed and outstanding data processing capability . The GOMU has the following functions: Provides configuration management, performance management, fault
management, security management, and loading management for the BSC Interfaces to the LMT/M2000 on behalf of the BSC (1) Screw
(2) Leaf spring
(3) Wrench
(4) RUN LED
(5) ALM LED
(6) ACT LED
(7) Reset button
(8) Shutdown button
(9) USB port
(10) ETH0 (Ethernet port)
(11) (11) ETH1 (Ethernet port)
(12) ETH2 (Ethernet port)
(13) COM port
(14) VGA port
(15) HD LED
(16) OFFLINE LED
(17) Hard disk
(18) Screw for fix the hard dis
Board——GOMU Indicator LED RUN
ALM
ACT
Color Status Gree On for 1s and off for 1s n On for 0.125s and off for 0.125s On for 2s and off for 2s
Red
The board is loading software. The board is being tested.
Steady on
There is power supply but the board is faulty. faulty.
Steady off
There is no power supply or the board is faulty. faulty.
On On (or flashing)
There is a fault related to the running board.
Steady off
There is no alarm.
Gree Steady on n Steady off
OFFLIN Blue On E Off
HD
Description The board is operating.
On for 0.125s and off for 0.125s Gree Flashing n Steady off
The board works in active mode. The board works in standby mode. The board can be removed. The board cannot be removed. The status of the board is switching. The hard disk is performing read and write operations. The hard disk is not performing read and write operations.
Summary
Summary
This chapter describes the following contents: •Structure of the BSC6000 •rack •Subrack •Structures and functions of boards
Chapter 1 System Description Chapter 2 Hardware Structure Chapter 3 System Principle Chapter 4 Typical Configuration Configur ation
Chapter 3 System Principle
Module Function
System Signal Flow
Software Loading
Alarm Channel
System Logical Structure The BSC6000 system consists of the following logical functional subsystems: TDM Switching Subsystem
Service Control Subsystem
GE Switching Subsystem
Interface and Signaling Processing Subsystem
Service Processing Subsystem
Clock Subsystem
Connection between subracks
TDM switching subsystem
Service processing subsystem
Service control subsystem
Interface and signaling processing subsystem
E1/STM-1 to BTS E1/STM-1 to PCU E1/STM-1 to MSC Clock subsystem
Connection between subracks
GE switching subsystem
TDM Switching Subsystem The Time Division Multiplexing (TDM) switching subsystem provides circuit switched domain
(CS) switching for the system. s ystem. The TDM switching subsystem has the following functions: Providing TDM bearers for the A, Abis, Ater, and Pb interfaces Performing TDM switching and providing circuit switched domain (CS) switching for the
system Providing TDM bearers for the system service processing
Logical Unit
Physical entity
TDM access bearer unit
GEIUB/GOIUB, GEIUB/GOIU B, GEIUP/GOIUP GEIUP/GOIU P, GEIUT/GOIUT GEIUT/GOIU T, GEIUA/GOIUA GEIUA/GOIU A
TDM switching unit
GTNU
TDM processing bearer unit
GDPUC
TDM Switching Unit The GTNU board operates in active and standby modes. When other boards perform active-standby switchover, the GTNU board detects the speech
channels on the LVDS links. When the GTNUs perform active-standby switchover, other boards detect the speech
channels on the LVDS links. Intra-Subrack TDM Switching: Other boards in the subrack connect the active/standby boards
through the Low Voltage Differential Signal (LVDS) high-speed serial ports GTNU (active)
Slot 0
GTNU (standby)
Slot 2
Slot 27 ………
Connection between a board and the active GTNU through a backplane TDM path Connection between a board and the standby GTNU through a backplane TDM path
Inter-Subrack Interconnections of GTNU Crossover Cables The right figure shows the
interconnections of GTNU crossover
0＃ GTNU
3＃ GTNU
GTNU
GTNU
cables when four service subracks are configured. interconnections of GTNU crossover
cables among GMPS&GEPS. interconnections of GTNU crossover
cables among GTCS
A X 2
P i n 1
A
X 1
P i n 1 4
1 2 3
W 2
W 1
W 4
W 3
X 4
X 3 B
P i n 1 4
B
P i n 1
1＃ GTNU
2＃ GTNU
GTNU
GTNU
GE Switching Subsystem The Gigabit Ethernet (GE) switching subsystem performs GE switching of signaling and O&M
interface. The hardware of the subsystem consists of the following entities: Backplane GSCU board GE interface units of the boards in the subsystem The GSCU performs operation and maintenance of its subrack and provides GE switching for the
other boards in the same subrack.
GE Switching Unit Intra-subrack active/standby GSCU boards: HiG interconnection; 30G bandwidth Intra-subrack GE switching: The GSCU board provides 48G GE switching capability. The slot 14,
slot 15, slot 26, and slot 27 are distributed 1G respectively. The slot 6 and slot 7 are not distributed. Other slots are distributed 2G respectively. GSCU1 GSCU Active
Slot 1
Slot 2
GSCU Standby
………
P o r t o n t h e p a n e l
12
48 GSCU0
12
GE
48 GE switching module Inter-subrack 60G
GE
P o r t o n t h e b a c k p l a n e
Slot 26
Connection between a board and the active GSCU through a backplane GE path Connection between a board and the standby GSCU through a backplane GE path
GSCUs to slots: 48G The GSCU provides 12 ports for inter-subrack interconnection: 12 x 1G Total: 48G+12x1G=60G
GE Switching Interconnection GSCU in GMPS GE 0
GE TRUNK1 GE 1
GE TRUNK2
GE 2 GE 3
GEPS
GEPS
GE 1
GE 6
3＃
GE 0
GE 7
GEPS
GE 5
GE 8
GE TRUNK4
Four intersubrack 1G network cables
GSCU0
GSCU1
GSCU0
GSCU1
GE 0
Local Main GTCS
GE 10
HiG interconnection 30G bandwidth
GE TRUNK5 GE 11
FE
Extension subrack
main subrack
GE 1
GE 1 GE 9
GSCU1
GE 1
GE 0
GE TRUNK3
GSCU0
GE 0
2＃
GE 4
GE TRUNK4
1＃
GBAM
Extension subrack
Structure of Inter-Subrack Interconnection A interface
GTCS
GTCS
Main GTCS
GTCS
TC
Ater interface
Abis interface
Pb interface
GEPS
GEPS
GMPS
GEPS
BM
The subracks in the BSC6000V100R001 compose an interconnection switching network through cascades. GSCU star interconnection GTNU full interconnection
Service Control Subsystem The service control subsystem has the following functions:
Paging control, system information management, channel assignment, voice call control, PS service control, handover, and power control The hardware entities: The GXPUM board The GXPUT board The GBAM server OR GOMU board The GSCU board in the GTCS subrack The GXPUM board performs the main service processing of the BSC6000, which includes four
CPU processing units. The four CPU processing units have the following functions: B TS CPU0: paging control, system information management, channel assignment, and BTS common service management CPU1～3: voice call control, PS service control, handover, and power control
Service Processing Subsystem The hardware entity of the service processing subsystem is the GDPUC board. It performs the
following functions: Transcoding Rate adaptation
Interface and Signaling Processing Subsystem The interface and signaling subsystem provides interfaces of BSC, BTS, and NSS, which performs
signaling processing function of data link layer. Providing A/Abis/Pb/Ater interfaces Supporting cell broadcast message service processing Supporting the MTP2 protocol of SS7 Supporting the LAPD protocol
BTS
Abis
GMPS/ GEPS
A
Ater
GTCS BSC
The trunk cable is categorized into the following types: 75Ω coaxial cable 75Ω Y-shaped coaxial cable 120Ω twisted pair cable 120ΩY-shaped twisted pair cable
Port: DB44 connector
Pb
PCU
Cb
CBC
MSC
Clock Subsystem The hardware entity of the clock subsystem is the GSM General ClocK Unit (GGCU). The clock sources of the BSC6000 are as follows: Building Integrated Timing Supply System (BITS)
There are two types of BITS clock: 2 MHz clock and 2 Mbit/s clock. cl ock. The 2 Mbit/s clock source has higher anti-interference capabilities than the 2 MHz clock source. Line clock
The line clock extracted from the A interface is processed and generates 2 MHz clock and 8 kHz clock. The 2 MHz clock signals output from the A interface panel and then are sent to the GGCU board in the GMPS subrack. Note: The R01 does not support this clock. Local free-run clock
Clock Subsystem GGCU Reference Clock Input To input the active-standby clock of the GGCU, you can use the signals provided by the BITS
and the 2.048MHz clock signal extracted from the upper-level clock by the interface panel in the service subrack. The GGCU backplane uses the interface panel of the same subrack to extract the 8 KHz clock
signals from the upper-level clocks. Reference Clock for the GMPS or GEPS
cl ock The reference clocks are provided by the GGCU. The reference clocks generate 8kHz clock signals through the GGCU. GMPS: The clock signals are sent to the GSCU in the GMPS subrack through the backplane.
Then, the clock signals are sent to other boards in the same subrack. GEPS: The clock signals are sent to the GSCU board in the GEPS subrack through the clock
cable. Then, the signals are sent to other boards through the backplane. Reference Clock for the GTCS Each GTCS extracts line clock from the A interface. The link clock is processed through A
interface panel and then generates 8 KHz clock signals. The clock signals are sent to the GSCU in the subrack through the backplane. Then the clock
signals are sent to other boards in the same subrack.
System Clock Scheme Active/standby GGCU In the subrack 0
Time synchronization primary reference
Backplane transmission
Distribution cable transmission
GSCU
GSCU
S e r v i c e b o a r d
GMPS
GSCU
Backplane transmission
Backplane transmission
Backplane transmission
S e r v i c e b o a r d
Transmission synchronization reference source
S e r v i c e b o a r d
S e r v i c e b o a r d
GEPS
S e r v i c e b o a r d
S e r v i c e b o a r d
GEPS
Clock synchronization Interconnection The connection of the GGCU of the main subrack and the GSCU of the extension subrack is shown
as following figure: The active GGCU and the standby GGCU output 10-way signal channel respectively. A signal
channel of an active GGCU and that of a standby GGCU are integrated through the Y-shaped cable. GGCU support six service subracks, one is the GMPS, others five are the GEPSs where the
10 cables from GSCUs to GGCU can be connected at most. most. Any of component including GGCU, Y-shaped cable, and GSCU is faulty, the system clock still
can work normally. 8
GEPS
2 X
GMPS GGCU
8
1
GSCU GGCU
3 X
GSCU
Y-shaped cable
… …
1
1 2 W
3 W
GEPS GSCU
GSCU
1 W
1
2
1 X 8
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Chapter 3 System Principle
Module Function
System Signal Stream
Software Loading
Alarm Path
Signal Flow of Basic Voice Service Voice service
BTS
Abis interface
G E I U B
G T N U
G E I U T
G E I U T
GMPS/GEPS
G T N U
G D P U C
Ater interface
G E I U A
MSC
A interface GTCS Front board
E1/T1 cable
Rear board
TDM switching on the backplane
PS Service Signal Flow
PS service:
G E I U B
BTS
Abis interface
G T N U
G E I U P
PCU
SGSN
GMPS/GEPS Pb interface
Gb interface
Front board
E1/T1 cable
Rear board
Backplane TDM switching
Service Signal Flow Abis interface 16K
GEIUB
GTNU
64K
64K
GEIUT
Ater interface GEIUT 16K
64K
GTNU
64K
GEIUA
64K
A interface
64K
16K
64K 16K 64K 16K Pb interface
GEIUP
GDPUC
64K
BM subrack
64K
TC subrack
A interface GEIUB
64K
GTNU
GEIUT
16K
GEIUT
64K
GTNU
64K
GEIUA
64K
Abis interface
64K 64K
BM subrack Voice service, non-crossover subrack switch Voice service, crossover subrack switch
GDPUC (TC)
TC subrack PS service, non-crossover subrack switch PS service, crossover subrack switch
SS7 on the A Interface The signals are processed through the MTP2, and then sent to the GXPUM in the mode of internal signaling flow
G X P U M
G S C U
G E I U T
G E I U T
GMPS/GEPS
Ater interface
GTCS
Front board Rear board
G T N U
G E I U A
MSC
A interface
E1/T1 cable TDM switching on the backplane GE switching on the backplane
Signal Flow of Cross-Subrack Call subrack bears a heavy load, other Description of control plane cross-subrack call: When access subrack subracks can share signaling. Abis接口
G E I U B
G
GSCU
GEIUT
Ater接口 Ater接口
GEIUT
GTNU
GEIUA
A接口
X P U M
BM框 BM框
TC框 TC框
A接口 Abis接口
G
G
E
X
I
P
U
U
B
M
GSCU
GEIUT
BM框 BM框
GEIUT
GTNU
GEIUA
TC框 TC框
cross-subrack signaling flow Normal signaling Flow
Signaling Flow on the Abis Interface
G X P U M
G S C U
G X P U T
GMPS/GEPS
The signals are processed through the LAPD, and then sent to the GXPUM in the mode of internal signaling flow
G E I U B
BTS
Abis interface
Front board
E1/T1 cable
Rear board
GE switching on the backplane
Signaling Signal Flow on the Ater Interface Internal Signaling Signal The signals are processed through the MTP2, and then sent to the GXPUM in the mode of the internal signaling flow
G X P U M
G S C U
G E I U T
G E I U T
GMPS/GEPS
Ater interface
G S C U
GTCS
The signals are processed through the MTP2, and then sent to the GSCU in the mode of internal signaling flow Front board
E1/T1 cable
Rear board
GE switching on the backplane
Signaling Signal Flow on the Pb Interface Pb signaling signal
G X P U M
G S C U
The signals are processed through the LAPD, and then sent to the GXPUM in the mode of internal signaling flow
G E I U P
GMPS/GEPS
PCU
Pb interface
Front board
E1/T1 cable
Rear board
GE switching on the backplane
O&M Flow HDLC link
G B A M
Service board
G S C U
Ater
GMPS
LAN Switch
G E I U T
G E I U T
d r a o b
G S C U
e c i v r e S
GTCS（remote ）
L M
M2000
T
E1/T1 cable
G S C U
业 务 单 板
Ethernet cable GE switch on backplane
GEPS
G S C U
d r a o b e c i v r e S
GTCS（local）
Chapter 3 System Principle
Module Function
System Signal Flow
Software Loading
Alarm Path
Software Loading
The loading process is the process that a board obtains program files and data files after the service subrack or the board starts or restarts.
The BSC6000 software loading control system has two layers:
The GBAM is the first-level center of the entire BSC software loading management. The loading and power-on of the GBAM are independent of other boards. The GBAM processes the loading control requests of the GSCU in the GMPS.
The GSCU in the GMPS is the second-level center of the loading control system. The GSCU processes the loading control requests of the service boards in the GMPS, GEPS, and GTCS.
Software Loading Path (GTCS at Local) GTCS
GMPS G B A M
G S C U
G S C U GEPS
G S S e r v i c e b o a r d
S e r v i c e b o a r d
C U
S e r v i c e b o a r d
GMPS GEPS
Main GTCS
extension GTCS
GE on the backplane
G S C U GTCS
S e r v i c e b o a r d
Inter-subrack Cable
Software Loading Path (Remote GTCS) GMPS
G B A M
G S C U
E I U T S e r v i c e b o a r d
GTCS E
G
I
S
U
C
T
U
S e r v i c e b o a r d
GMPS GEPS
Main Remote GTCS
extension GTCS
GE on the backplane
G S C U GEPS
S e r v i c e b o a r d
G S C U GTCS
S e r v i c e b o a r d
Inter-subrack Cable HDLC
Loading Software to the GSCU Board
The process of the software loading for the GSCU in GMPS is as follows: 1.
After the GSCU starts up, it broadcasts the BOOTP request.
If the GBAM is online, it processes and responds to the request.
If the GBAM is not started or is offline, the GSCU starts up and loads data from its own flash memory, acts as a second-level loading control center, and then processes the BOOTP requests of the other boards.
2.
After receiving the response from the GBAM, the GSCU determines whether to obtain the latest application files from the GBAM based on the loading control characters and the software version in the flash memory.
3.
If the GSCU needs to obtain the program files from the GBAM, it i t obtains the program software from the software area in the GBAM and writes it into the flash. It then loads the software from the flash.
4.
After the program files are loaded, the GSCU starts to load the data files. The loading process of the data files is the same as that of the program files.
Loading Software to the Other Boards in GMPS/GEPS
After the software of the GSCU is loaded, the loading of the software for the other boards in the subrack starts. 1.
After a board is started, it broadcasts the BOOTP request. The request contains the physical address of this board and the software version information stored in the flash.
2.
After the GSCU receives the BOOTP request, it transparently transmits this request to the GSCU in the GMPS if the subrack s ubrack is not the GMPS.
3.
The GSCU in the GMPS calculates the IP address of the board based on the physical address of the board, and then obtains the loading control character from the configuration data of the board.
If the loading control character is Load from Flash, Flash, then the GSCU in the GMPS responds to the BOOTP request. The response carries the IP address and the loading control character, notifying the board to obtain the program files from the flash and load them.
If the loading control character is Auto, Auto, then the GSCU in the GMPS determines whether the software version in the flash of this board is consistent with that in the software area of the GBAM, and then responds to the BOOTP request. The response carries the IP address and the loading control character.
If the loading control character is Load from Server, Server, then the GSCU directly downloads the application files from the version section on the GBAM.
Loading Software to the Other Boards 4.
After the program files run, the board sends a LOAD request to the GSCU in the GMPS to query the files except the program files.
5.
The GSCU in the GMPS returns a file list to the board. Based on the file list, the board responds to the GSCU with the file version information in the flash.
6.
The GSCU compares the version information and responds to the board with the information (carrying the GBAM address) about the files to be updated.
7.
The board downloads the files from the software area in the GBAM and loads them.
Loading Software to the Boards in a Remote GTCS The GSCU in the main GTCS is a second-level loading control center. The loading of the remote
GTCSs can be independent on the Ater O&M link to some extent. When the Ater O&M link is broken, the GSCU in the main GTCS processes the loading requests from the boards in the subrack. When the Ater O&M link is normal, the GSCU in the GMPS processes all the loading requests from the remote GTCSs and the GSCU in the GTCS stops working as a loading control center. The software loading for a remote GTCS consists of: Loading Software to the GSCU Loading Software to the other boards
The process of loading software to the remote service boards is similar to that of loading software to the local service boards. The differences are as follows: The files downloaded from the GBAM are first saved in the remote loading control center before being downloaded to the other boards. The remote service boards download files through Ater O&M links, which work in active/standby mode. The bandwidth of each Ater O&M link is 1 64 kbit/s to 3064 kbit/s.
Chapter 3 System Principle
Module Function
System Signal Flow
Software Loading
Alarm Path
Connection of Alarm Box Connection scheme: The alarm box accesses LMT client through serial ports When an alarm is reported, the LMT uses the convert program to drive the alarm box to
generate visual and audio indications. The user performs alarm box management, such as terminating alarm sounds and disabling
alarm indicators.
Alarm management module GBAM
Convert
LMT
Alarm box
Report of Alarm from Local Subrack The report process of alarm from local subrack: The service board generates alarm The alarm is shielded and filtered on the service board, and then is reported to the GBAM
through GE switching. The GBAM reports the alarm to LMT/EMS and records alarm log.
GMPS Service board
GSCU
GEPS Service board
GSCU
GBAM
LMT Convert
Alarm box
Report of Alarm from Remote Subrack The report process of alarm from remote subrack is shown as follows: The service board of remote subrack generates alarm. The alarm is shielded and filtered on the service board. The alarm is transferred to the local GEIUT through the GE switching, and then sent to the
GEIUT of main subrack through the SS7 of the Ater interface. The local GEIUT reports the alarm to the GBAM through GE switching. The GBAM reports the alarm to LMT/EMS and records alarm log.
GTCS Service board
GMPS GEIUT
GEIUT
GSCU
GBAM
LMT Convert
Alarm box
Report of Alarm from BTS Report process of alarm from BTS The BTS generates alarm that is shielded and filtered in the BTS. The alarm is sent to the local EIUB through the OML. After processed through the LAPD
protocol on the EIUB, the alarm is sent to the GBAM through GE switching. The GBAM reports the alarm to LMT/EMS and records alarm log.
GMPS BTS
GEIUB
GSCU
GEPS BTS
GEIUB
GSCU
GBAM
LMT Convert
Alarm box
Summary
Summary
This chapter describes operating process of the BSC6000, including
module function, software loading, system signal flow, and alarm path.
Chapter 1 System Description Chapter 2 Hardware Structure Chapter 3 System Principle Chapter 4 Typical Configur Configuration ation
Configuration Principles The GEIU/GOIU provide E1 port or STM-1 port. To ensure the orderliness of rack, insert the GEIU
/GOIU boards at the rear of slots. The Abis interface supports four mulitiplexing modes, including 4: 1, 3: 1, 2: 1, and 1: 1. Each GEIUB board at most supports 512 Lapd links The proportion between the number of the Ater interface boards and that of A interface boards is 1: 4,
so that the multiplexing capability of the Ater interface can be supported. Each GDPUC board can processes 968-way voice. The GDPUC board uses N+1 redundancy
configuration. All the TC resources are shared through the resource pool.
Configuration Principles Except the GTNU and the GSCU, other boards can be inserted at random. But, in the configuration operation provided by the LMT, each board should be inserted in the
specified slots: Two GSCUs should be inserted in the slot 6 and slot 7 of the GMPS/GEPS/GTCS. They
work in active/standby mode. Two GTNUs should be inserted in the slot 4 and slot 5 of the GMPS/GEPS/GTCS. They
work in active/standby mode. Two GGCUs should be inserted in the slot 12 and slot 13 of the GMPS. They work in
active/standby mode. The GXPUMs can be inserted in slot 0 and slo1 of the GMPS/GEPS according to
requirements. The GXPUTs can be inserted in slot 2 and slot 3 of the GMPS/GEPS according to
requirements. The GDPUCs can be inserted in slot 0 to slot 3 and slot 8 to slot 13 of the GTCS according
to requirements. The GOMUs must be inserted in slot 20 to slot 23 of the GMPS
Configuration Principles Two GEIU boards must be configured into active board and standby board. The GEIUBs/GOIUBs can be inserted in slot 18 to slot 27 of the GMPS/GEPS according to
requirements. The GEIUPs/GOIUPs can be inserted in slot 14 and slot 15 of the GMPS/GEPS according to
requirements. The GEIUTs/GOIUTs can be inserted in slot 16 and slot 17 of the GMPS/GEPS and slot 14 to
slot 17 of the GTCS according to requirements. The GEIUAs/GOIUAs can be inserted in slot 18 to slot 27 of the GTCS according to
requirements.
Typical Configuration Capacity of this configuration:
The BSC supports 512TRX full rate/256TRX half rate ; The EIUB is configured according
to the number of BTS and the number of carrier. capacity, Based on the service capacity, the GDPUC is configured through the N+1 redundancy. The EUIP is configured optionally
according to actual services. The GXPUC is configured
optionally according to actual services.
Typical Configuration Capacity of full configuration: When a BSC6000 is fully configured, it supports 2048TRX.
Summary
Summary
This chapter describes the configuration principles of the BSC6000
and lists some typical configurations in the actual deployment.
Oct. 25 2007
Internal Use (Only)
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GSM BSS Training Team
HUAWEI TECHNOLOGIES TECHNOLOGIES Co., Ltd.
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