01 G-LI 000 BSC6000 Hardware Structure and System Description-20070523-A-1.0

Dec 31 2006

HUAWEI TECHNOLOGIES Co., Ltd.

www.huaw

ei.com

HUAWEI Confidential

Internal Use (Only)

GSM BSS Training Team

ENE040613040001 HUAWEI BSC6000

Hardware Structure and System Description

ISSUE 1.0

HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential

� This course describes the hardware structure of

the HUAWEI BSC6000 system, board module

functions, system operating principles, system

signal flows, and O&M flows. In addition, this

course describes the principles of hardware

configuration and lists some typical

configurations.


Reference

�HUAWEI BSC6000 Hardware Reference

�HUAWEI BSC6000 System Description

�HUAWEI BSC6000 Architecture and Principles


Purpose

After learning this course, you should understand

the following contents:

� HUAWEI BSC6000 function and features

� HUAWEI BSC6000 hardware structure

� HUAWEI BSC6000 system principle

� HUAWEI BSC6000 typical configuration


Chapter 1 System Description

Chapter 2 Hardware Structure

Chapter 3 Working Principle

Chapter 4 Typical Configuration


SGSN

MSC

GGSN

.

HLR

Abis

Pb

BSC

MSBTS

MSBTS

MSBTS

PCU

UmPDN

AGs

Gb

� 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: 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

� Low cost, low power consumption

� 256TRX power consumption: 1640W (including GTCS ) :

� 2048TRX power consumption: 6920W (including GTCS) :

� Flexible configuration

� Supporting multiple types of networking between BSCs and BTSs

� 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

� 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

GSM BSC Service Processing RackGBSR

GSM BSC Control Processing RackGBCR

GSM Integrated Management SystemGIMS

GSM TransCoder SubrackGTCS

GSM Main Processing SubrackGMPS

GSM Extended Processing SubrackGEPS

GSM Back Administration ModuleGBAM

Full Name Abbreviation


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

cablePort 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.

GXPUM Slot 0～2

GTNU Slot 4～5

GSCU Slot 6～7

GGCU Slot 12～13

GEIUB Slot 18～27

GEIUT Slot 16～17

GEIUP Slot 14～15


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.

GXPUM slot 0～2

GTNU slot 4～5

GSCU slot 6～7

GEIUB slot 18～27

GEIUT slot 16～17

GEIUP slot 14～15


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.

GTNU slot 4～5

GSCU slot 6～7

GDPUC slot 8～

13&0～3

GEIUT slot 14～17

GEIUA slot 18～27


Dip switch of Subracks

O N1 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.

8

It is undefined, and is generally set as

“0”. 7

Odd parity check bit6

Subrack number control bit5





MeaningBit

� 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

GSM General Clock UnitGGCU

GSM Switching and Control UnitGSCU

GSM TDM Switching UnitGTNU

GSM extensible Processing Unit for Cell broadcast serviceGXPUC

GSM extensible Processing Unit for Main serviceGXPUM

GSM Data Processing Unit for CS serviceGDPUC

GSM E1/T1 Interface Unit for AGEIUA

GSM E1/T1 Interface Unit for AbisGEIUB

GSM E1/T1 Interface Unit for PbGEIUP

GSM E1/T1 Interface Unit for AterGEIUT

GSM Optic Interface Unit for AGOIUA

GSM Optic Interface Unit for AbisGOIUB

GSM Optic Interface Unit for PbGOIUP

GSM Optic Interface Unit for AterGOIUT

Full name Abbreviation


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

Matching

ConnectorFunction Port

SMB male connectorSynchronization clock signal input port, used to

input one route of external 2.048 MHz signal and

2.048 Mbit/s code stream signals

CLKIN0～1

SMB male connectorStandbyTESTIN

SMB male connectorStandbyTESTOUT

RJ45 StandbyCOM0～1

RJ45 Synchronization signal output port, used to

output 8 kHz clock signals to the GSCU

CLKOUT0～9

� 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


Board——GSCU

RJ4510M/100M/1000M Ethernet ports, used to connect subracksEHT0～9

RJ4510M/100M/1000M Ethernet ports, used to connect GBAM

(Only the main subrack is connected with the GBAM) EHT10～11

RJ45Debugging port COM

RJ45 Clock source port, used to receive the 8 kHz clock signals

from the panel of the GGCU CLKIN

SMB connectorClock test signal port, used to output clock test signalsTESTOUT

MatchingFunction Port

� 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 subrack

� Providing clock information for the other boards in the same subrack

except the GGCU

S C U a

P A R C

R U N

A L M

A C T

CO

M

T E S T O U T

CL

KIN

A C TL I N K

10

/10

0/1

000

BA

SE

-T

R E S E T

A C TL I N K

8

9

0

1

2

3

4

5

6

7

1 1

1 0

A C TL I N K


Board ——GTNU

DB14 TDM high-speed serial port, used to connect the GTNUs

between subracksTDM0～5

Matching

connector Function Port

G T N U

P A R C

R U N

A L M

A C T

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

Rear

pla

ne

6 24

LVDS LVDSTDM switching module

128K*128K

Fro

nt

pla

ne


Board——GXPUM

G X P U

P A R C

R U N

A L M

A C T

10

/100

/10

00

BA

SE

-T

A C TL I N K

0

1

2

3

�Paging control

�System information management

�Channel assignment

�BTS common service management

�Voice call control

�Packet service control

�Handover

�Power control

RJ45GE/FE Ethernet port, reserved10/100/1000BASE-T0～3

Matching


� 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——GXPUC

G X P U

P A R C

R U N

A L M

A C T

10

/100

/10

00

BA

SE

-T

A C TL I N K

0

1

2

3

RJ45GE/FE Ethernet port,

reserved10/100/1000BASE-T0～3

Matching


� The GXPUC is the cell broadcast processing unit in the BSC6000. The

active GXPUC and standby GXPUC are inserted in slots 8 and slot 9 in

the GMPS or GEPS. The GXPUC performs the message cell broadcast

function of the system.

� The GXPUC has the following functions:

� Providing a port for connecting the Cell Broadcast Center (CBC)

� Storing cell broadcast messages

� Scheduling cell broadcast messages based on the Cell Broadcast

Channel (CBCH)


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)

SMB male

connector

2.048 MHz clock output port, used to output the testing

clock of the systemTESTOUT

SMB male

connector

2.048 MHz clock source output port, used to output the

extracted line clock as the system clock source2M0～1

DB44 E1/T1 port, used to transmit and receive E1/T1 signals on

routes 0–7

E1/T1(0～

31)

Matching

connector Function Interface

� 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

OFFONUsed to set the protection grounding of the transmitting end of E1/T1 links 24–31

1～8S6


1～8S5


1～8S4


1～8S3

OFFONUnused5～8

OFFONUsed to select the impedance on E1/T1 links 24–314



OFFONUsed to select the impedance on E1/T1 links 0–71S1

120Ω75ΩDescription BitDIP

switch

� 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——GDPUC

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

GDPUC 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

D P U a

P A R C

R U N

A L M

A C T


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

GDPUC TDM processing bearer unit

GTNU TDM switching unit

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

Physical entity Logical Unit

� 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.

� 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

W1

W3

W2

W4

1

B B

X4 X3X1X2

A A

Pin14

Pin1Pin14

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.

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………

Po

rt on th

e p

an

el

Po

rt on th

e b

ackp

lan

e

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


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 GXPUC board

� The GBAM server

� 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

� The GXPUC board performs the cell broadcast function; the GBAM server performs BTS O&M

management; the GSCU board in the GTCS subrack performs the TC resource pool management


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/

GEPSGTCS MSC

PCU CBC

BSC

Abis

Pb Cb

AterA

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.

Note:

The R01 does not support this clock.

� Local free-run clock


Clock Subsystem � GGCU Reference Clock Input

� To input the active-standby clock of the GGCU, you can use the signals provided by the BITS

and the 2.048MHz clock signal extracted from the upper-level clock by the interface panel in

the service subrack.

� The GGCU backplane uses the interface panel of the same subrack to extract the 8 KHz clock

signals from the upper-level clocks.

� Reference Clock for the GMPS or GEPS

� 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

rvic

e b

oa

rd

Se

rvic

e b

oa

rd

Se

rvic

e b

oa

rd

Se

rvic

e b

oa

rd

Se

rvic

e b

oa

rd

Se

rvic

e b

oa

rd

GMPSGEPS

Time synchronization primary reference

Transmission synchronization reference source

Backplane

transmission

Distribution cable

transmission

Backplane

transmission

Backplane

transmission

Backplane 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

GEPS

GSCU GSCU

GEPSGSCU GSCU

Y-shaped

cable

……

11

2

18

18 18

W2

W3

X2 X3

W1

X1



� Module Function

� System Signal Stream


� 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

Aterinterface

A interface

GDPUC

GEIUB

BTS

Abisinterface


PS Service Signal Flow

� PS service:

E1/T1 cable

Backplane TDM switching

Pb interface Gb interface

Front board

Rear board

Abis

interface

GTNU

GEIUP

SGSN

GMPS/GEPS

GEIUB

BTS PCU


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 64K

A interface


SS7 on the A Interface

GXPUM

GSCU

GEIUT

GTNU

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

interfaceA

interface

E1/T1 cable

GE switching on the backplane

TDM switching on the backplaneFront board

Rear board


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框

GTNUGEIUT GEIUA

BM框

GEIUTGSCU A接口Ater接口

BM框

GSCU GEIUT

TC框

GTNUGEIUT GEIUA

A接口

G

E

I

U

B

Abis接口

Abis接口


Signaling Flow on the Abis Interface

GXPUM

GSCU

GEIUB

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


Signaling Signal Flow on the Ater Interface

Internal Signaling Signal

GXPUM

GSCU

GEIUT

GSCU

GEIUT

The signals are processed through the

MTP2, 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 the

mode of internal signaling flow

E1/T1 cable


Front board

Rear board


Signaling Signal Flow on the Pb Interface

Pb signaling signal

GXPUM

GSCU

GEIUP

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 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

Service board

业务单板

GEPS

HDLC link

GSCU

GTCS（local）

LAN Switch

M2000

Service board



� Module Function



� 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)

G

B

A

M

G

S

C

U

GMPS

Main GTCS

extension GTCS

GEPS

GE on the backplane

Inter-subrack Cable

GMPS

Se

rvic

e b

oa

rdGEPS GTCS

G

S

C

U

G

S

C

U

Se

rvic

e b

oa

rd

Se

rvic

e b

oa

rd

GTCS

G

S

C

U

Se

rvic

e b

oa

rd


Software Loading Path (Remote GTCS)

GEPS GTCS

GTCSGMPS

E

I

U

T

G

B

A

M

G

S

C

U

EI

U

T

G

S

C

U

G

S

C

U

G

S

C

U

GMPS

Main Remote GTCS

extension GTCS

GEPS

GE on the backplane

HDLC

Inter-subrack Cable

Se

rvic

e b

oa

rd

Se

rvic

e b

oa

rdS

erv

ice

bo

ard

Se

rvic

e b

oa

rd


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.


Loading Software to the Other Boards

4. After the program files run, the board sends a LOAD request to the GSCU in the GMPS to

query the files except the program files.

5. The GSCU in the GMPS returns a file list to the board. Based on the file list, the board

responds to the GSCU with the file version information in the flash.

6. The GSCU compares the version information and responds to the board with the information

(carrying the GBAM address) about the files to be updated.

7. The board downloads the files from the software area in the GBAM and loads them.


Loading Software to the Boards in a Remote GTCS

� The GSCU in the main GTCS is a second-level loading control center. The loading of the remote

GTCSs can be independent on the Ater O&M link to some extent.

� When the Ater O&M link is broken, the GSCU in the main GTCS processes the loading

requests from the boards in the subrack.

� When the Ater O&M link is normal, the GSCU in the GMPS processes all the loading requests

from the remote GTCSs and the GSCU in the GTCS stops working as a loading control center.

� The software loading for a remote GTCS consists of:

� Loading Software to the GSCU

� Loading Software to the other boards

The process of loading software to the remote service boards is similar to that of loading

software to the local service boards. The differences are as follows:

� The files downloaded from the GBAM are first saved in the remote loading control center

before being downloaded to the other boards.

� The remote service boards download files through Ater O&M links, which work in

active/standby mode. The bandwidth of each Ater O&M link is 1�64 kbit/s to 30�64

kbit/s.



� Module Function



� 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

GSCUGBAM

LMT

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 GSCUGBAM

LMT

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 GSCUGBAM

LMT

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.

� Each GEIUB board at most supports 256 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.

� 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 GXPUCs can be inserted in slot 8 and slot 9 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.



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

� The GEIUBs/GOIUBs can be inserted in slot 18 to slot 27 of the GMPS/GEPS according to

requirements.

� The GEIUPs/GOIUPs can be inserted in slot 14 and slot 15 of the GMPS/GEPS according to

requirements.

� The GEIUTs/GOIUTs can be inserted in slot 16 and slot 17 of the GMPS/GEPS and slot 14 to

slot 17 of the GTCS according to requirements.

� The GEIUAs/GOIUAs can be inserted in slot 18 to slot 27 of the GTCS according to

requirements.


Typical Configuration

� Capacity of this configuration:

The BSC supports 512TRX full

rate/256TRX half rate ;

� The EIUB is configured according

to the number of BTS and the

number of carrier.

� 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 full

rate/1024TRX half rate.


Summary

� This chapter describes the configuration principles of the BSC6000

and lists some typical configurations in the actual deployment.

Summary Summary

Dec 31 2006

HUAWEI TECHNOLOGIES Co., Ltd.

www.huaw

ei.com

HUAWEI Confidential

Internal Use (Only)

GSM BSS Training Team

Thank You

www.huawei.com

01 G-LI 000 BSC6000 Hardware Structure and System Description-20070523-A-1.0

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Transcript of 01 G-LI 000 BSC6000 Hardware Structure and System Description-20070523-A-1.0