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Oct. 25 2007

HUAWEI TECHNOLOGIES Co., Ltd.

www.huawei.com

HUAWEI Confidential

Internal Use (Only)

GSM BSSTraining Team

HUAWEI BSC6000

Hardware Structure and

System Description

ISSUE 3.0

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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential Page 2

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: 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

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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

Summary

Summary

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Chapter 3 Working Principle


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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

TheBSC6000 rack is categorized into two types: GBCR:GSM BSC Control Processing Rack

GBSR:GSM BSC Service Processing Rack

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RackGBCR

GBCR (GSM BSC Control Processing Rack ):

It must be configured with main processingsubrack 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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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

subrack

Air defence

subrack

Power

distributionbox

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 0027 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

CablingTrough

00 13

2714

06

20

Service

board

Interface

board

Motherboard

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SubrackGMPS

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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SubrackGEPS

GEPS: It performs basic service processing function of the BSC6000. Each BSC6000 has 03

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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SubrackGTCS 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.

GTNU slot 45

GSCU slot 67

GDPUC slot 8

13&03

GEIUT slot 1417

GEIUA slot 1827

Di it h f S b k

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Dip switch of Subracks

ON1 8

Bit Meaning

1 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 lessdependent 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 15 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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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 operatingplatform of the GBAM.

DC input power socket

Power switch

Port for display cablePort for keyboard

cablePort 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 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 serviceGDPUC 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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BoardGGCU

GGCU

PARC

RUNALMACT

ATN-IN

8

9

COM0

COM1

0

1

2

3

4

5

6

7

CLKOUT

TESTIN

TESTOUT

CLKLIN1

CLKLIN0

Port Function

Matching

Connector

CLKOUT09 Synchronization signal output port, used to

output 8 kHz clock signals to the GSCU

RJ45

COM01 Standby RJ45

TESTOUT Standby SMB male connector

TESTIN Standby SMB male connector

CLKIN01 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 from the

active and standby GGCUs

GSCU

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BoardGSCU

Port Function Matching

EHT09 10M/100M/1000M Ethernet ports, used to connect subracks RJ45

EHT101110M/100M/1000M Ethernet ports, used to connect GBAM

(Only the main subrack is connected with the GBAM)

RJ45

COM Debugging portRJ45

CLKINClock 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.TheGSCU board provides maintenance management of the subrackand GE

switching platform for the subrack.

The GSCU has the following functions:

Performing maintenance management of the subrack

Providing a GE platform for the subrack

Providing clock information for the other boards in the same subrack

except the GGCU

SCUa

PARC

RUN

ALM

ACT

CO

M

TESTOUT

CL

KIN

ACT

LINK

1 0

/ 1 0 0

/ 1 0 0 0

B A S E

- T

RESET

ACTLINK

8

9

0

1

2

3

4

5

6

7

11

10

ACTLINK

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Board GTNU

Port FunctionMatching

connector

TDM05TDM high-speed serial port, used to connect the GTNUs

between subracks

DB14

GTNU

PARC

RUN

ALM

ACT

TNM5

TNM4

TNM0

TNM1

TNM2

TNM3

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

Rearplane

6 24

LVDS LVDSTDM switching

module

128K*128KFrontplane

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BoardGXPUM

GXPU

PARC

RUN

ALM

ACT

10/100/1000BASE-

T

ACTLINK

0

1

2

3

Paging control

System information management

Channel assignment

BTS common service management

Voice call control

Packet service control

Handover

Power control


connector

10/100/1000BASE-T03 GE/FE Ethernet port, reserved RJ45

The GXPUM is the main service processing unit in the BSC6000. The activeGXPUM 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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BoardGXPUT

GXPU

PARC

RUN

ALM

ACT

10/100/1000BASE-

T

ACTLINK

0

1

2

3


connector

10/100/1000BASE-T03GE/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

Board GEIU / GOIU

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Board GEIU / GOIU

GEIU

PARC

RUNALMACT

TESTOUT

2M0

2M1

GOIU

PARC

RUNALMACT

TESTOUT

2M0

2M1

LOS

TX

RX

E1/T1(0~7)

E1/T1(16~23)

E1/T1(24~31)

E1/T1(8~15)

Interface FunctionMatching

connector

E1/T1(0

31)

E1/T1 port, used to transmit and receive E1/T1 signals on

routes 07

DB44

2M012.048 MHz clock source output port, used to output the

extracted line clock as the system clock source

SMB male

connector

TESTOUT2.048 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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BoardGEIU

DIP

switch

Bit Description 75 120

S1 1 Used to select the impedance on E1/T1 links 07 ON OFF

2 Used to select the impedance on E1/T1 links 8

15 ON OFF3 Used to select the impedance on E1/T1 links 1623 ON OFF

4 Used to select the impedance on E1/T1 links 2431 ON OFF

58 Unused ON OFF

S3 18 Used to set the protection grounding of thetransmitting end of E1/T1 links 07

ON OFF

S4 18 Used to set the protection grounding of thetransmitting end of E1/T1 links 815 ON OFF


ON OFF


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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BoardGDPUC

The GDPUC is the circuit service processing unit in the BSC6000. TheGDPUC 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 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

DPUa

PARC

RUN

ALM

ACT

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BoardGOMU

As the OM center of the BSC, The GOMUs are installed in slots 2023 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 theBSC

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 dis

B d GOMU I di

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BoardGOMU IndicatorLED ColorStatus Description

RUN Gree

n

On for 1s and off for 1s The board is operating.

On for 0.125s and off for0.125s

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 Gree

n

Steady on The board works in active mode.

Steady off The board works in standby mode.

OFFLIN

E

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 Gree

n

Flashing The hard disk is performing read and write operations.

Steady off The hard disk is not performing read and write

operations.

S

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Summary

Summary This chapter describes the following contents:Structure of the BSC6000

rack

SubrackStructures and functions of boards

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Chapter 3 System Principle


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Module Function

System Signal Flow

Software Loading

Alarm Channel

S stem Logical Str ct re

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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

Connection

betweensubracks

TDM switching subsystem

GE switching subsystem

Clock

subsystem

Service

processingsubsystem

E1/STM-1 to BTSInterface

and

signalingprocessing

subsystem

E1/STM-1 to PCU

E1/STM-1 to MSC

Service

controlsubsystem

Connectionbetween

subracks


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Logical Unit Physical entity

TDM access bearer unit GEIUB/GOIUB, GEIUP/GOIUP, GEIUT/GOIUT, GEIUA/GOIUA

TDM switching unit GTNU

TDM processing bearer unit GDPUC

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

TDM Switching Unit

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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

Inter-Subrack Interconnections of GTNU

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Crossover Cables The right figure shows the

interconnections of GTNU crossovercables 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

Pin1

2

W1

W3

W2

W4

1

B B

X4

X3

X1

X2

A A

Pin14

Pin1

Pin14

3


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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

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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.

GSCU

Active

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

Porton

the

panel

Porto

nthe

backplane

12

12 48

48

GE GE

GSCU1

GSCU0

GE switching

module

Inter-subrack

60G

GSCUs to slots: 48G

The GSCU provides 12 ports for inter-subrack

interconnection: 12 x 1G

Total: 48G+12x1G=60G

GE Switching Interconnection

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GBAM

GSCU in GMPS

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 TRUNK5

GE 0

GE 1

GE 0

GE 1

GE 0

GE 1

1

GEPS

GE TRUNK2

GE Switching Interconnection

mainsubrack

Extension

subrack

Four inter-

subrack 1G

networkcables

GSCU0

GSCU0 GSCU1

GSCU1

GSCU0 GSCU1

HiG interconnection

30G bandwidth

Extension

subrack

GE 0

GE 1

Local Main GTCS

GE TRUNK4

2

GEPS

3

GEPS

Structure of Inter-Subrack Interconnection

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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

GTCSTC

GEPS

GMPS

GEPS

GEPSBM

GSCU star interconnection

GTNU full interconnection

Service Control Subsystem

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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

CPU13: voice call control, PS service control, handover, and power control


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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

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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/

GEPSGTCS MSC

PCU CBC

BSC

Abis

Pb Cb

AterA

Port: DB44 connector

The trunk cable is categorized into the following types: 75 coaxial cable

75 Y-shapedcoaxial cable

120 twisted pair cable

120Y-shaped twisted pair cable

Clock Subsystem

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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.

Note:

The R01 does not support this clock.

Local free-run clock

Clock Subsystem

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y 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 inthe 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.

System Clock Scheme

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GSCU GSCU GSCU

Active/standby GGCU

In the subrack 0

Service

board

Service

board

Service

board

Service

board

Service

board

Service

board

GMPSGEPS

Time synchronization

primary reference

Transmission synchronization

reference source

Backplane

transmission

Distribution cable

transmission

Backplane

transmission

Backplane

transmission

Backplane

transmission

GEPS

System Clock Scheme

Clock synchronization Interconnection

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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.

y

GMPS

GGCUGGCU

GEPS

GSCU GSCU

GEPS

GSCU GSCU

Y-shaped

cable

1

1

2

18

18 18

W2

W3

X2

X3

W1

X1

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Module Function

System Signal Stream

Software Loading

Alarm Path

Signal Flow of Basic Voice Service

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Voice service

E1/T1 cable

TDM switching

on the backplane

Front board

Rear board

G

TN

U

G

E

IU

T

G

TN

U

G

E

IU

T

G

E

IU

A

MSC

GTCSGMPS/GEPS

Ater

interface

A interface

G

D

P

U

C

G

E

IU

B

BTS

Abis

interface

PS Service Signal Flow

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PS service:

E1/T1 cable

Backplane TDM switching

Pb interface Gb interface

Front board

Rear board

Abis

interface

G

T

N

U

G

E

IU

P

SGSN

GMPS/GEPS

G

E

IU

B

BTS PCU

Service Signal Flow

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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 64K

A interface

SS7 on the A Interface

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G

XP

U

M

G

S

C

U

G

EI

U

T

G

TN

U

G

EI

U

T

G

EI

U

A

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 backplaneFront board

Rear board

Signal Flow of Cross-Subrack Call

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Description of control plane cross-subrack call: When access subrack bears a heavy load, othersubracks can share signaling.

Normal signaling Flow

cross-subrack signaling flow

TC

GTNUGEIUT GEIUA

BM

GEIUTGX

P

U

M

GSCU AAter

BM

GSCU GEIUT

TC

GTNUGEIUT GEIUAA

G

X

P

U

M

G

E

I

U

B

G

E

I

U

B

Abis

Abis

Signaling Flow on the Abis Interface

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HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI ConfidentialPage 62

G

X

P

U

M

G

SC

U

G

X

P

U

T

BTS

E1/T1 cable


The signals are processed through the LAPD,

and then sent to the GXPUM in the mode of

internal signaling flow

GMPS/GEPS Abis

interface

Front board

Rear board

G

E

I

U

B

Signaling Signal Flow on the Ater Interface

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Internal Signaling Signal

G

X

PU

M

G

SC

U

G

E

IU

T

G

SC

U

G

E

IU

T

The signals are processed through theMTP2, and then sent to the GXPUM in the

mode of the internal signaling flow

GTCSGMPS/GEPS Ater

interface

The signals are processed through the

MTP2, and then sent to the GSCU in themode of internal signaling flow

E1/T1 cable


Front board

Rear board

Signaling Signal Flow on the Pb Interface

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Pb signaling signal

G

X

PU

M

G

S

C

U

G

E

IU

P

PCU

The signals are processed through the LAPD,

and then sent to the GXPUM in the mode of

internal signaling flow

GMPS/GEPS Pb interface

E1/T1 cable


Front board

Rear board

O&M FlowHDLC li k

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Service

boardGS

C

U

G

E

I

U

T

G

S

C

U

G

E

I

U

T

E1/T1 cable

GE switch on backplane

Ethernet cable

GTCSremoteGMPSAter

G

S

CU

L

M

T

G

B

A

MService

board

GEPS

HDLC link

G

S

CU

GTCSlocal

LAN Switch

M2000

Servic

e

board

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Module Function

System Signal Flow

Software Loading

Alarm Path

Software Loading

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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 GSCUprocesses the loading control requests of the service boards in the GMPS, GEPS, and GTCS.

Software Loading Path (GTCS at Local)

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G

B

A

M

G

S

C

U

GMPS

Main GTCS

extension GTCS

GEPS

GE on the backplane

Inter-subrack Cable

GMPS

Service

board

GEPS GTCS

G

S

CU

G

S

CU

Service

board

Service

board

GTCS

G

S

C

U

Service

board

Software Loading Path (Remote GTCS)

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GEPS GTCS

GTCSGMPS

E

I

U

T

G

B

A

M

G

S

C

U

EI

U

T

G

S

C

U

G

SC

U

G

S

C

U

GMPS

Main Remote GTCS

extension GTCS

GEPS

GE on the backplane

HDLC

Inter-subrack Cable

Service

board

Servic

eboardService

board

Service

board

Loading Software to the GSCU Board

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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 thesoftware 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.

Loading Software to the Other Boards in GMPS/GEPS

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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.

Loading Software to the Other Boards

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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

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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 loadingrequests 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 164 kbit/s to 3064kbit/s.

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Module Function

System Signal Flow

Software Loading

Alarm Path

Connection of Alarm Box

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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

Report of Alarm from Local Subrack

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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

GSCUGBAM

LMT

ConvertAlarm box

GEPS

GSCU

Service

board

Service

board

Report of Alarm from Remote Subrack

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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.


GMPS

GEIUT GSCUGBAM

LMT

Convert

Alarm box

GTCS

GEIUTService

board

Report of Alarm from BTS

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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.


GMPS

GEIUB GSCUGBAM

LMT

ConvertAlarm box

GEPS

GEIUB GSCU

BTS

BTS

Summary

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This chapter describes operating process of the BSC6000, including

module function, software loading, system signal flow, and alarm path.Summary

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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

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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.


Except the GTNU and the GSCU other boards can be inserted at random

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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


Two GEIU boards must be configured into active board and standby board

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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:

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Capacity of this configuration:

The BSC supports512TRX full

rate/256TRX half rate ;

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.

Typical Configuration Capacity of full configuration: When a BSC6000 is fully configured, it supports 2048TRX.

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Summary

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This chapter describes the configuration principles of the BSC6000

and lists some typical configurations in the actual deployment.

Summary

Oct. 25 2007 Internal Use (Only)

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HUAWEI TECHNOLOGIES Co., Ltd.

www.huawei.com

HUAWEI Confidential

GSM BSSTraining Team

Thank You

www.huawei.com

bsc 6900 huawei

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