2. HUAWEI BSC6000 Hardware Structure and System Description

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

HUAWEI TECHNOLOGIES Co., Ltd. Page 2HUAWEI 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


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


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



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



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


This chapter describes the following contents: • Design mentality of the HUAWEI BSC6000 system • System specifications • Functions and Features

SummarySummary

Summary




Chapter 3 Working Principle




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

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


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


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.

DC input power socket

Power switch

Port for display cable Port for keyboard

cable Port for mouse 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


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


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


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


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 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


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 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”.



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

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


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


Board——GSCU


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


Board ——GTNU


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


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


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:


Board——GXPUT

GXPU

PARC

RUN

ALM

ACT

10

/10

0/1

000

BA

SE

-T

ACTLINK

0

1

2

3


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


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)


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


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.


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


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)



(13) COM port (14) VGA port (15) HD LED

(16) OFFLINE LED (17) Hard disk (18) Screw for fix the hard disk


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.


Summary

Summary Summary This chapter describes the following contents: •Structure of the BSC6000•rack •Subrack •Structures and functions of boards




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

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


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


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 Crossover Cables The right figure shows the

interconnections of GTNU crossover

cables when four service subracks are

configured.


cables among GMPS&GEPS.


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


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.

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


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


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


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


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 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


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.


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.


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




GEPS

System Clock Scheme


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



Module Function

System Signal Stream

Software Loading

Alarm Path


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


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


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


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


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


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



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)

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


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


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.


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.



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 Alarm box

Convert

LMT


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


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.


GMPS

GEIUT GSCU GBAMLMT

ConvertAlarm box

GTCS

GEIUTService board


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.


GMPS

GEIUB GSCU GBAMLMT

ConvertAlarm box

GEPS

GEIUB GSCU

BTS

BTS


Summary

This chapter describes operating process of the BSC6000, including

module function, software loading, system signal flow, and alarm

path.

Summary Summary







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.


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 .

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.


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

www.huawei.com

Documents

2. HUAWEI BSC6000 Hardware Structure and System Description