2. huawei bsc6000 hardware structure and system description
TRANSCRIPT
Oct. 25 2007
HUAWEI TECHNOLOGIES Co., Ltd.
www.huawei.com
HUAWEI Confidential
Internal Use (Only)
GSM BSS Training Team
HUAWEI BSC6000Hardware Structure and
System Description
ISSUE 3.0
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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.
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Reference
HUAWEI BSC6000 Hardware Reference
HUAWEI BSC6000 System Description
HUAWEI BSC6000 Architecture and Principles
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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
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Chapter 1 System Description
Chapter 2 Hardware Structure
Chapter 3 Working Principle
Chapter 4 Typical Configuration
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BSC
PCU
GGSNSGSN
MSC HLR
MS
MS
MS
MS
BTS
BTS
BTS
A
Pb
Gb
Gs
UM Abis
The HUAWEI BSC6000 is a new generation GSM BSC product after the HUAWEI
BSC32.
Location of the BSC6000 in the GSM Network
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Features of the BSC6000 System
Large capacity, high integration
Supporting at most 2048TRX;
Maximum of traffic: 13,000 Erl; BHCA : 35,00,000;
Full-configuration subscriber: 650 000
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
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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
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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
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This chapter describes the following contents: • Design mentality of the HUAWEI BSC6000 system • System specifications • Functions and Features
SummarySummary
Summary
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Chapter 1 System Description
Chapter 2 Hardware Structure
Chapter 3 Working Principle
Chapter 4 Typical Configuration
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Chapter 2 Hardware Structure
Rack and Subrack
Board
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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
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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
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Rack—— GBCR
GBCR (GSM BSC Control Processing Rack ):
It must be configured with main processing
subrack and GBAM server. It processes the
BSC6000 services and performs operations and
maintenance.
In the GBCR, a GIMS and at most two
subracks can be configured .
GIMS: GSM Integrated Management System
consists of the following components:
One KVM (keyboard, video and mouse)
One LAN Switch
One GBAM (GSM Back Administration
Module) server
GBAM
Dummy
panel
LAN Switch
KVM
Cabling subrack Air
defence
subrack
Power distribution
box
Subrack
Subrack
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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 distributed-
power 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
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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
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KVM
The KVM is a device integrating a keyboard, a
display, and a mouse. It is the operating
platform of the GBAM.
DC input power socket
Power switch
Port for display cable Port for keyboard
cable Port for mouse cable
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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
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Rack ——GBSR
GBSR (GSM BSC Service Processing Rack ): It is only
configured with subracks. It performs service 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
service racks.
Dummy panel
插框插框subrack
Air defence
subrack
Power distribution
box
Air defence subrack
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Subrack
Subrack: The subrack complies with the
IEC60297 standard. The width of it is 19 inches.
A backplane is in the middle of the subrack, and
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.
The BSC6000 contains three subracks:
GMPS main processing subrack
GEPS extension processing subrack
GTCS voice processing subrack
Board
Fan box
Cabling Trough
前插单板
后插单板
背板
00 13
2714
06
20
Service board
Interface board
Mother board
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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 Type AConfiguration Type B
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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.
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Subrack——GTCS GTCS: A GTCS (GSM TransCoder Subrack ) performs transcoding, rate adaptation and sub-
multiplexing.
When the BSC6000 uses E1 transmissions on the A interface, a GTCS provides a maximum of
3,840 speech channels.
When the BSC6000 uses STM-1 transmissions on the A interface, a GTCS provides a maximum of
7,680 speech channels.
1300 01 02 03 07060504 08 09 10 1211
GDPUC
GSCU
GSCU
GTNU
GTNU
2714 15 16 17 21201918 22 23 24 2625
GEIUT
GEIUT
GEIUA
GEIUA
GEIUA
GEIUA
GEIUA
GEIUA
Rearboard
Frontboard
Backplane
GEIUA
GEIUA
GDPUC
GDPUC
GDPUC
GDPUC
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Dip switch of Subracks
ON1 8
Bit Meaning
1 Subrack number control bit
2 Subrack number control bit
3 Subrack number control bit
4 Subrack number control bit
5 Subrack number control bit
6 Odd parity check bit
7It 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 starting, and load from the Flash file if the Flash file is valid or load from the server if the Flash file is invalid.
The switch state “ON” means 0 and “OFF”
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
eight DIP bits, the quantity of “1” must be
odd.
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”.
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Chapter 2 Hardware Structure
Rack and Subrack
Board
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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
GDPUX 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
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Board——GGCU
GGCU
PARC
RUNALMACT
ATN-IN
8
9
COM0
COM1
0
1
2
3
4
5
6
7
CLK
OU
TT
ES
TIN
TE
ST
OU
T
CLK
LIN
1
CLK
LIN
0
Port Function Matching
Connector
CLKOUT0 ~
9
Synchronization signal output port, used to
output 8 kHz clock signals to the GSCU
RJ45
COM0 ~ 1 Standby RJ45
TESTOUT Standby SMB male connector
TESTIN Standby SMB male connector
CLKIN0 ~ 1 Synchronization clock signal input port, used to
input one route of external 2.048 MHz signal and
2.048 Mbit/s code stream signals
SMB male connector
The GGCU is the general clock unit in the BSC6000. The active GGCU and
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
Keeping the consistency of synchronization information output between
the active and standby GGCUs
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Board——GSCU
Port Function Matching
EHT0 ~ 9 10M/100M/1000M Ethernet ports, used to connect subracks RJ45
EHT10 ~
11
10M/100M/1000M Ethernet ports, used to connect GBAM
(Only the main subrack is connected with the GBAM)
RJ45
COM Debugging port RJ45
CLKIN Clock source port, used to receive the 8 kHz clock signals
from the panel of the GGCU
RJ45
TESTOUT Clock test signal port, used to output clock test signals SMB connector
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.
The GSCU board provides maintenance management of the subrack and GE
switching platform for the subrack.
The GSCU has the following functions:
Performing maintenance management of the subrack
Providing a GE platform for the boards in the subrack
Providing clock information for the other boards in the same subrack
except the GGCU,GXPUT,GXPUM
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Board ——GTNU
Port Function Matching
connector
TDM0 ~ 5 TDM high-speed serial port, used to connect the GTNUs
between subracks
DB14
GTNU
PARC
RUN
ALM
ACT
TN
M5
TN
M4
TN
M0
TN
M1
TN
M2
TN
M3
The GTNU is the TDM switching unit in the BSC6000. The active GTNU and the
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
center of the system.
The GTNU has the following functions:
Providing 128 K 128 K TDM switching
Allocating TDM network resources, establishing, and releasing radio links
Rea
r pl
ane
6 24
LVDS LVDSTDM switching module
128K*128K
Fro
nt p
lane
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Board——GXPUM
GXPU
PARC
RUN
ALM
ACT
10
/10
0/1
000
BA
SE
-T
ACTLINK
0
1
2
3
Paging controlSystem information managementChannel assignmentBTS common service management
Voice call controlPacket service controlHandoverPower control
Port Function Matching
connector
10/100/1000BASE-T0 ~ 3 GE/FE Ethernet port, reserved RJ45
The GXPUM is the main service processing unit in the BSC6000. The active
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:
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Board——GXPUT
GXPU
PARC
RUN
ALM
ACT
10
/10
0/1
000
BA
SE
-T
ACTLINK
0
1
2
3
Port Function Matching
connector
10/100/1000BASE-T0 ~ 3GE/FE Ethernet port,
reserved
RJ45
The GXPUT is the transmission processing unit in the BSC6000. The
active GXPUT and standby GXPUT are inserted in slots 2 and slot 3 in
the GMPS or GEPS. The GXPUT performs the short message cell
broadcast and LAPD links 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
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Board ——GEIU / GOIU
GEIU
PARC
RUNALMACT
TE
ST
OU
T2M
02M
1
GOIU
PARC
RUNALMACT
TE
ST
OU
T2M
02M
1
LOS
TX
RX
E1/T1(0~7)
E1/T1(16~23)
E1/T1(24~31)
E1/T1(8~15)
Interface Function Matching
connector
E1/T1(0 ~
31)
E1/T1 port, used to transmit and receive E1/T1 signals on
routes 0–7
DB44
2M0 ~ 1 2.048 MHz clock source output port, used to output the
extracted line clock as the system clock source
SMB male
connector
TESTOUT 2.048 MHz clock output port, used to output the testing
clock of the system
SMB male
connector
The GEIU / GOIU can be categorized into the following types : 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. 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.
The GEIU/GOIU has the following functions: Processing the SS7 MTP2 protocols Processing the Link Access Procedure on the D channel (LAPD) protocols Providing maintenance links when GTCS subracks are configured at the
MSC side Performing inter-board Tributary Protect Switching (TPS)
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Board——GEIU
DIP switch
Bit 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
The DIP switches of the GEIU board is set through the 75-ohm coaxial cable transmission mode. Reset
the DIP switches of the GEIU board if onsite engineers adopt other transmission modes.
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Board——GDPUX
The GDPUX is the circuit service processing unit in the BSC6000. The
GDPUX board can be inserted in slot 0 to slot 3, slot 8 to slot 13 of the
GTCS subrack. The board performs the voice and data service
processing functions. It works in resource pool mode.
The GDPUX 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
DPUa
PARC
RUN
ALM
ACT
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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) 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 disk
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Board——GOMU IndicatorLED Color Status DescriptionRUN Gree
nOn for 1s and off for 1s The board is operating.
On for 0.125s and off for 0.125s
The board is loading software.
On for 2s and off for 2s The board is being tested.
Steady on There is power supply but the board is faulty.
Steady off There is no power supply or the board is faulty.
ALM Red On (or flashing) There is a fault related to the running board.
Steady off There is no alarm.
ACT Green
Steady on The board works in active mode.
Steady off The board works in standby mode.
OFFLINE
Blue On The board can be removed.
Off The board cannot be removed.
On for 0.125s and off for 0.125s
The status of the board is switching.
HD Green
Flashing The hard disk is performing read and write operations.
Steady off The hard disk is not performing read and write operations.
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Summary
Summary Summary This chapter describes the following contents: •Structure of the BSC6000•rack •Subrack •Structures and functions of boards
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Chapter 1 System Description
Chapter 2 Hardware Structure
Chapter 3 System Principle
Chapter 4 Typical Configuration
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Chapter 3 System Principle
Module Function
System Signal Flow
Software Loading
Alarm Channel
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System Logical Structure
The BSC6000 system consists of the following logical functional subsystems:
TDM Switching Subsystem
GE Switching Subsystem
Service Processing Subsystem
Service Control Subsystem
Interface and Signaling Processing Subsystem
Clock Subsystem
Connectionbetweensubracks
TDM switching subsystem
GE switching subsystem
Clocksubsystem
Serviceprocessingsubsystem
E1/STM-1 to BTSInterface
andsignaling
processingsubsystem
E1/STM-1 to PCU
E1/STM-1 to MSC
Servicecontrol
subsystem
Connectionbetweensubracks
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TDM Switching Subsystem
Logical Unit Physical entity
TDM access bearer unit GEIUB/GOIUB, GEIUP/GOIUP, GEIUT/GOIUT, GEIUA/GOIUA
TDM switching unit GTNU
TDM processing bearer unit GDPUX
The Time Division Multiplexing (TDM) switching subsystem provides circuit switched domain
(CS) switching for the system.
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
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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) GTNU (standby)
Slot 0 Slot 2 Slot 27………
Connection between a board and the active GTNU through a backplane TDM pathConnection between a board and the standby GTNU through a backplane TDM path
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Inter-Subrack Interconnections of GTNU Crossover Cables The right figure shows the
interconnections of GTNU crossover
cables when four service subracks are
configured.
interconnections of GTNU crossover
cables among GMPS&GEPS.
interconnections of GTNU crossover
cables among GTCS
1 #
0 #GTNU GTNU
GTNU GTNU
2 #GTNU GTNU
3 #GTNU GTNU
Pin12
W1W3
W2W4
1
B B
X4 X3X
1
X2
A APin
14
Pin1Pin1
4
3
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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.
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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.
GSCUActive
Slot 1
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
GSCU
Standby
Slot 2 Slot 26………
Po
rt on
the
pa
ne
l
Po
rt on
the
ba
ckpla
ne
12
12 48
48
GE GE
GSCU1
GSCU0
GE switching module
Inter-subrack 60G
GSCUs to slots: 48GThe GSCU provides 12 ports for inter-subrack interconnection: 12 x 1GTotal: 48G+12x1G=60G
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GBAM
GSCU (main subrack)
GE 0
GE 1
GE 2
GE 3
GE 4
GE 5
GE 6
GE 9
GE 7
GE 8
GE 10
GE 11
FE
GE TRUNK1
GE TRUNK3
GE TRUNK4
GE TRUNK6
GE TRUNK5
CPU FE
GE 0
GE 1
GE 0
GE 1
GE 0
GE 1
GSCU (extension subrack)
1#
2#
3#
GE TRUNK2
GE Switching Interconnection
main
subrack
Extension subrack
Four inter-subrack 1G network cables
GSCU0
GSCU0 GSCU1
GSCU1
GSCU0 GSCU1
HiG interconnection 30G bandwidth
Extension subrack
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Structure of Inter-Subrack Interconnection
A interface
Pb interface Abis interface
Ater interface
The subracks in the BSC6000V100R001 compose an interconnection switching network through cascades.
GTCS
Main GTCS
GTCS
GTCS TC
GEPS
GMPS
GEPS
GEPSBM
GSCU star interconnection
GTNU full interconnection
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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: 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
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Service Processing Subsystem
The hardware entity of the service processing subsystem is the GDPUC board. It performs the
following functions:
Transcoding
Rate adaptation
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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 BTSGMPS/GEPS
GTCS MSC
PCU CBC
BSC
Abis
Pb Cb
Ater A
Port: DB44 connector
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
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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. 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.
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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
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.
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GSCU GSCU GSCU
Active/standby GGCUIn the subrack 0
Se
rvice
bo
ard
Se
rvice
bo
ard
Se
rvice
bo
ard
Se
rvice
bo
ard
Se
rvice
bo
ard
Se
rvice
bo
ard
GMPSGEPS
Time synchronization primary reference
Transmission synchronization reference source
Backplane transmission
Distribution cable transmission
Backplane transmission
Backplane transmission
Backplane transmission
GEPS
System Clock Scheme
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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.
Any of component including GGCU, Y-shaped cable, and GSCU is faulty, the system clock still
can work normally.
Clock synchronization Interconnection
GMPSGGCUGGCU
GEPSGSCU GSCU
GEPSGSCU GSCU
Y-shaped cable
……
11
2
1818 18
W2
W3
X2 X3
W1
X1
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Chapter 3 System Principle
Module Function
System Signal Stream
Software Loading
Alarm Path
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Signal Flow of Basic Voice Service Voice service
E1/T1 cable
TDM switching on the backplane
Front board
Rear board
GTNU
GEIUT
GTNU
GEIUT
GEIUA
MSC
GTCSGMPS/GEPS
Ater interface
A interface
GDPUX
GEIUB
BTS
Abis interface
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PS Service Signal Flow
PS service:
E1/T1 cable
Backplane TDM switching
Pb interface Gb interface
Front board
Rear board
Abis interface
GTNU
GDPUP
SGSN
GMPS/GEPS
GEIUB
BTS GFGUG
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Service Signal Flow
TC subrack GDPUC
GTNUGEIUT GEIUA
BM subrack
GEIUTGEIUB GTNUAbis interface
Pb interface
A interface
Voice service, non-crossover subrack switch
Voice service, crossover subrack switch
PS service, non-crossover subrack switch
Ater interface
BM subrack
GTNU
Abis interface
GEIUB GEIUT
GEIUP
16K
16K
16K 64K
64K
64K
64K
64K
64K
64K
64K
16K
16K
64K 64K 64K
64K
16K
64K
PS service, crossover subrack switch
TC subrack
GDPUC(TC)
GTNUGEIUT GEIUA64K 64K 64KA interface
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SS7 on the A Interface
GXPUM
GSCU
GEIUT
GEIUT
GEIUA
MSC
The signals are processed through the MTP2, and then sent to the GXPUM in the mode of internal
signaling flow
GTCSGMPS/GEPS Ater
interface A interface
E1/T1 cable
GE switching on the backplane
TDM switching on the backplane Front board
Rear board
GTNU
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Signal Flow of Cross-Subrack Call Description of control plane cross-subrack call: When access subrack bears a heavy load, other
subracks can share signaling.
Normal signaling Flow
cross-subrack signaling flow
TC ubrack
GTNUGEIUT GEIUA
BM subrack
GEIUTGSCU A interfaceAter interface
BM subrack
GSCU GEIUT
TC subrack
GTNUGEIUT GEIUA
A interface
GEIUB
Abis interface
Abis interface
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O&M Flow
Service boardG
SCU
GEIUT
GSCU
GEIUT
E1/T1 cable
GE switch on backplane
Ethernet cable
GTCS ( remote )
GMPS Ater
GSCU
L
M
T
GBAM
Serv
ice
board
GEPS
GSCU
GTCS ( local )
LAN Switch
M2000
Serv
ice
board
Serv
ice
board
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Chapter 3 System Principle
Module Function
System Signal Flow
Software Loading
Alarm Path
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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.
HUAWEI TECHNOLOGIES Co., Ltd. Page 65HUAWEI Confidential
Software Loading Path (GTCS at Local)
GBAM
GSCU
GMPS
Main GTCS
extension GTCS
GEPS
GE on the backplane
Inter-subrack Cable
GMPS
Service
board
GEPS GTCS
GSCU
GSCU
Service
board
Service
board
GTCS
GSCU
Service
board
HUAWEI TECHNOLOGIES Co., Ltd. Page 66HUAWEI Confidential
Software Loading Path (Remote GTCS)
GEPS GTCS
GTCSGMPS
EIUT
GBAM
GSCU
EIUT
GSCU
GSCU
GSCU
GMPS
Main Remote GTCS
extension GTCS
GEPS
GE on the backplane
HDLC
Inter-subrack Cable
Service
board
Service
board S
ervice board
Service
board
HUAWEI TECHNOLOGIES Co., Ltd. Page 67HUAWEI Confidential
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 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.
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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 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, 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, 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, then the GSCU directly downloads the
application files from the version section on the GBAM.
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Chapter 3 System Principle
Module Function
System Signal Flow
Software Loading
Alarm Path
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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 Alarm box
Convert
LMT
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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
GSCU GBAMLMT
ConvertAlarm box
GEPS
GSCU
Service board
Service board
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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.
GMPS
GEIUT GSCU GBAMLMT
ConvertAlarm box
GTCS
GEIUTService board
HUAWEI TECHNOLOGIES Co., Ltd. Page 73HUAWEI Confidential
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
GEIUB GSCU GBAMLMT
ConvertAlarm box
GEPS
GEIUB GSCU
BTS
BTS
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Summary
This chapter describes operating process of the BSC6000, including
module function, software loading, system signal flow, and alarm
path.
Summary Summary
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Chapter 1 System Description
Chapter 2 Hardware Structure
Chapter 3 System Principle
Chapter 4 Typical Configuration
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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.
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.
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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
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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.
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Typical Configuration
Capacity of this configuration:
The BSC supports 512TRX .
The EIUB is configured according
to the number of BTS and the
number of carrier.
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.
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Typical Configuration Capacity of full configuration: When a BSC6000 is fully configured, it supports 2048TRX.
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Summary
This chapter describes the configuration principles of the BSC6000
and lists some typical configurations in the actual deployment.
Summary Summary
Oct. 25 2007
HUAWEI TECHNOLOGIES Co., Ltd.
www.huawei.com
HUAWEI Confidential
Internal Use (Only)
GSM BSS Training Team
Thank You
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