1- EnE040613040001 HUAWEI BSC6000 Hardware Structure and System Description-20061231-A-1.0

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    Dec 31 2006

    HUAWEI TECHNOLOGIES Co., Ltd.

    www.huawei.com

    HUAWEI Confidential

    Internal Use (Only)

    GSM BSSTraining Team

    ENE040613040001 HUAWEI BSC6000

    Hardware Structure and

    System Description

    ISSUE 1.0

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    This course describes the hardware structure of

    the HUAWEI BSC6000 system, board module

    functions, system operating principles, system

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

    course describes the principles of hardware

    configuration and lists some typical

    configurations.

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    Reference

    HUAWEI BSC6000 Hardware Reference

    HUAWEI BSC6000 System Description

    HUAWEI BSC6000 Architecture and Principles

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    Purpose

    After learning this course, you should understand

    the following contents:

    HUAWEI BSC6000 function and features

    HUAWEI BSC6000 hardware structure

    HUAWEI BSC6000 system principle

    HUAWEI BSC6000 typical configuration

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    Chapter 1 System Description

    Chapter 2 Hardware Structure

    Chapter 3 Working Principle

    Chapter 4 Typical Configuration

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    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

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    Features of the BSC6000 System Large capacity, high integration

    Supporting 2048TRX at the full rate; supporting 1024TRX at the half rate

    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 (including GTCS ) :

    1640W (A interface in E1 mode)

    1570W (A interface in STM-1 mode)

    2048TRX power consumption (including GTCS) :

    6920W (A interface in E1 mode)

    5620W (A interface in STM-1 mode)

    Flexible configuration

    Supporting multiple types of networking between BSCs and BTSs

    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 Edge 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

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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

    Supportinglocal 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 1 System Description

    Chapter 2 Hardware Structure

    Chapter 3 Working Principle

    Chapter 4 Typical Configuration

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    Chapter 2 Hardware Structure

    Rack and Subrack

    Board

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    Abbreviation

    Abbreviation Full Name

    GBCR GSM BSC Control Processing Rack

    GBSR GSM BSC Service Processing Rack

    GBAM GSM Back Administration Module

    GEPS GSM Extended Processing Subrack

    GMPS GSM Main Processing Subrack

    GTCS GSM TransCoder Subrack

    GIMS GSM Integrated Management System

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    Structure of Rack

    Model: The BSC6000 uses HUAWEI N68-22 rack. The rack design

    complies with the IEC60297 and IEEE standards.

    Structure

    Dimension: 600mm (width) x800mm (depth) x 2200mm (height)

    Weight: Empty rack 150kg; full configuration 350kg

    Type

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

    GBSR: GSM BSC Service Processing Rack

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    Rack GBCR

    GBCR (GSM BSC Control Processing Rack ):

    It must be configured with main 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

    LANSwitch

    KVM

    Cablingsubrack Air

    defence

    subrack

    Powerdistribution

    box

    Subrack

    Subrack

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    RackGBSR

    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.

    Dummypanel

    subrack

    Air defence

    subrack

    Power

    distributionbox

    Airdefencesubrack

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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

    Front of subrack Rear of subrack

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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.

    GXPUM Slot 02

    GTNU Slot 45

    GSCU Slot 67

    GGCU Slot 1213

    GEIUB Slot 1827

    GEIUT Slot 1617

    GEIUP Slot 1415

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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.

    GXPUM slot 02

    GTNU slot 45

    GSCU slot 67

    GEIUB slot 1827

    GEIUT slot 1617

    GEIUP slot 1415

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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.

    GTNU slot 45

    GSCU slot 67

    GEIUB slot 913

    GEIUT slot 1417

    GEIUA slot 1827

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    SubrackGTCS

    When the BSC6000 uses STM-1 transmissions on the A interface, a GTCS provides a maximum

    of 7,680 speech channels.

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    Chapter 2 Hardware Structure

    Rack and Subrack

    Board

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    AbbreviationAbbreviation Full name

    GGCU GSM General Clock Unit

    GSCU GSM Switching and Control Unit

    GTNU GSM TDM Switching Unit

    GXPUC GSM Extended Processing Unit for Cellbroadcast service

    GXPUM GSM Extended Processing Unit for Main service

    GDPUC GSM Data Processing Unit for CS service

    GEIUA GSM E1/T1 Interface Unit for A

    GEIUB GSM E1/T1 Interface Unit for Abis

    GEIUP GSM E1/T1 Interface Unit for Pb

    GEIUT GSM E1/T1 Interface Unit for Ater

    GOIUA GSM Optic Interface Unit for A

    GOIUB GSM Optic Interface Unit for Abis

    GOIUP GSM Optic Interface Unit for Pb

    GOIUT GSM Optic Interface Unit for Ater

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    BoardGGCU

    GGCU

    PARC

    RUNALMACT

    ATN-IN

    8

    9

    COM0

    COM1

    0

    1

    2

    3

    4

    5

    6

    7

    CL

    KOUT

    TESTIN

    TESTOUT

    CLKLIN1

    CLKLIN0

    Port FunctionMatching

    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

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    BoardGSCU

    Port Function Matching

    EHT08 10M/100M/1000M Ethernet ports, used to connect subracks RJ45

    ETH9 Connecting to the DEBUG port, used as a service path RJ45

    EHT1011 10M/100M/1000M Ethernet ports, used to connect subracks RJ45

    DEBUG Connecting with the ETH9 port 10/100/1000BASE-T9, usedas a service path

    RJ45

    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.The

    GSCU 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

    COM

    TESTOUT

    CLKIN

    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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    BoardGTNU

    Port Function

    Matching

    connector

    TDM05 TDM high-speed serial port, used to connect the GTNUsbetween subracks

    DB14

    GTNU

    PARC

    RUN

    ALM

    ACT

    TN

    M5

    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

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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 assignmentBTS common service management

    Voice call control

    Packet service control

    HandoverPower control

    Port FunctionMatching

    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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    BoardGXPUC

    GXPU

    PARC

    RUN

    ALM

    ACT

    10/100/1000BASE-T

    ACTLINK

    0

    1

    2

    3

    Port FunctionMatching

    connector

    10/100/1000BASE-T03GE/FE Ethernet port,

    reserved

    RJ45

    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)

    B d GEIU / GOIU

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    BoardGEIU / 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

    DIPswitch

    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 815 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

    S5 18 Used to set the protection grounding of thetransmitting end of E1/T1 links 1623

    ON OFF

    S6 18 Used to set the protection grounding of thetransmitting end of E1/T1 links 2431

    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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    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

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    BoardGBAM Module Port

    Display port

    RJ45 NICRJ45 NIC port RJ45 Serial port

    RJ45 NIC10M/100M adaptiveEthernet port

    Port for the mouse

    and keyboard

    DC input power socketGroundingscrew

    Power button

    CD-ROM

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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 cable

    Port for keyboard

    cablePort for mouse cable

    Fan Box

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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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    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

    S

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    Summary

    Summary This chapter describes the following contents:Structure of the BSC6000rack

    SubrackStructures and functions of boards

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    Chapter 1 System Description

    Chapter 2 Hardware Structure

    Chapter 3 System Principle

    Chapter 4 Typical Configuration

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    Chapter 3 System Principle

    Module Function

    System Signal Flow

    Software Loading

    Alarm Channel

    S t L i l St t

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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

    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

    Service Control Subsystem Interface and Signaling Processing Subsystem

    Clock Subsystem

    TDM Switching Subsystem

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    TDM Switching Subsystem

    Logical Unit Physical entity

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

    TDM switching unit GTNU

    TDM processing bearer unit 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 Access Bearer Unit

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    TDM Access Bearer Unit

    The TDM access bearer unit provides TDM bearers for the services on the A, Abis, Ater, and Pb

    interface. The hardware of it consists of GEIUB, GEIUP, GEIUT, and GEIUA. Each board has thesame hardware structure that contains backplane and subboard. Through loading software, the

    functions of A, Abis, Ater, and Pb interface can be enabled.

    Trunk Cable

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    Trunk Cable

    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

    Port: DB44 connector

    Trunk Cable

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    Trunk Cable

    Connecting the 75 Y-shaped coaxial cable

    TDM Switching Unit

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    g

    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 througha backplane TDM pathConnection between a board and the standby GTNUthrough a backplane TDM path

    TDM Switching Unit

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    TDM Switching Unit

    Porton

    the

    panel

    Porton

    th

    ebackplane

    6 24

    LVDS LVDS

    Inter-Subrack TDM Switching: The TDM switching units interconnect with each other through

    GTNU crossover cables.

    GTNU0

    GTNU0 GTNU1

    GTNU1

    GTNU0 GTNU1

    Interconnection

    LVDS serial(bearing on

    the HWcable

    TDM switching module128K x 128K

    The GTNU to each slot: 4K;24x4k=96kSix ports provided by the GTNU: 6x4k=24k8k redundancy: 128k-96k-24k=8k

    GTNU

    Inter-Subrack Interconnections of GTNU

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    Crossover Cables The right figure shows the

    interconnections of GTNU crossover

    cables when four service subracks are

    configured.

    1

    0

    GTNU GTNU

    GTNU GTNU

    2

    GTNU GTNU

    3

    GTNU GTNU

    GTNU Crossover Ethernet Cable

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    Pin12

    W1 W3

    W2 W4

    1

    B

    B

    X4

    X3X1

    X2

    A

    A

    Pin14

    Pin1 Pin14

    3

    TDM Processing Bearer Unit

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    TDM Processing Bearer Unit

    The TDM processing bearer unit performs TDM bearers for the GDPUC services.

    The TDM switching module on the GDPUC provides 16 K 16 K timeslot switching. It can switch

    timeslots between the backplane and the Digital Signal Processing (DSP) module.

    GE Switching Subsystem

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    GE Switching Subsystem

    The Gigabit Ethernet (GE) switching subsystem performs GE switching of signaling and O&M

    interface.

    The hardware of the subsystem consists of the following entities:

    Backplane

    GSCU board

    GE interface units of the boards in the subsystem

    The GSCU performs operation and maintenance of its subrack and provides GE switching for the

    other boards in the same subrack.

    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.

    GSCUActive

    Slot 1 Slot 2 Slot 26

    Connection between a board and the active GSCU through abackplane GE path

    Connection between a board and the standby GSCUthrough a backplane GE path

    GSCU

    Standby

    HiG interconnection

    GE Switching Unit

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    main

    subrack

    Extension

    subrack

    Extension

    subrack

    Four inter-subrack 1Gnetworkcables

    GSCU0

    GSCU0 GSCU1

    GSCU1

    GSCU0GSCU1

    HiG interconnection30G bandwidth

    Inter-subrack GE switching: start interconnection through crossover networks

    Porton

    the

    panel

    Porton

    the

    backplane

    12

    12 48

    48

    GE GE

    GSCU1

    GSCU0

    GE switchingmodule

    Inter-subrack60G

    HiG interconnection 30Gbandwidth

    GSCUs to slots: 48GThe GSCU provides 12 ports for inter-subrackinterconnection: 12 x 1GTotal: 48G+12x1G=60G

    GE Switching Unit

    GE Switching Interconnection Scheme

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    LMT

    M2000/NM centerLanSwitch

    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 (extensionsubrack)

    1

    2

    3

    GE TRUNK2

    GE Switching Interconnection Scheme

    To ease the cabling

    To realize inter-subrack interconnection

    through the GE0/GE1 ports

    To realize interconnection between the GSCU

    and GBAM through the GE10/GE11 ports

    CBC

    Structure of Inter-Subrack Interconnection

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    A interface

    Pb interface Abis interface

    Ater interface

    The subracks in the BSC6000V100R001 compose an interconnection switchingnetwork through cascades.

    GTCS

    Main GTCS

    GTCS

    GTCSTC

    GEPS

    GMPS

    GEPS

    GEPSBM

    GSCU star interconnection

    GTNU full interconnection

    Service Processing Subsystem

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    g y

    The hardware entity of the service processing subsystem is the GDPUC board. It performs the

    following functions:

    Transcoding

    Rate adaptation

    Service Control Subsystem

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    y

    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

    CPU13: 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

    Interface and Signaling Processing Subsystem

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    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

    AterA

    Clock Subsystem

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    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:

    Local free-run clock

    Clock Subsystem

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    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 GGCUIn the subrack 0

    Service

    board

    Service

    board

    Service

    board

    Service

    board

    Service

    board

    Service

    board

    GMPSGEPS

    Time synchronization

    primary reference

    Transmission synchronization

    reference source

    Backplanetransmission

    Distribution cabletransmission

    Backplane

    transmission

    Backplane

    transmission

    Backplane

    transmission

    GEPS

    y

    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.

    Any of component including GGCU, Y-shaped cable, and GSCU is faulty, the system clock still can

    work normally.

    The Y-shaped cable can ensure the switchover of the GGCU, which does not affect the GSCU to

    receive clock.

    GMPS

    GGCUGGCU

    GEPS

    GSCU GSCU

    GEPS

    GSCU GSCU

    Y-shapedcable

    Clock Cable

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    11

    2

    1

    8

    1

    8

    1

    8

    W2

    W3

    X2

    X3

    W1

    X1

    Configuration for the Clock in the GGCU

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    Configuration for the clock in the GGCU:

    If there is no BITS, extract the synchronization reference clock from the interface board ofmain subrack, so that the synchronization reference clock can be sent to the GGCU

    through the backplane. Other distribution cables are not required. In this case, the GGCU

    chooses the clock reference of backplane.

    If BITS is available, the GGCU should be equipped with distribution cables. If other

    synchronization reference clocks are required, the GGCU chooses line clock and BITS

    clock as the clock reference. It uses the BITS first.

    Clock Subsystem Control

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    To realize O&M for the GGCU, transmitthe operation and maintenance information of O&M

    terminal (LMT) to the GBAM server, and then send it to the GSCU board of the GMPS.

    GBAMGSCU

    GGCU

    LMT

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    Chapter 3 System Principle

    Module Function

    System Signal Stream

    Software Loading

    Alarm Path

    Signal Flow of Basic Voice Service

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    Voice service:

    The voice signal is sent to the GEIUB of service subrack through the Abis interface (16/8Kbit/s

    sub-timeslot).

    The GEIUB demultiplexes the voice signal into 64 kbit/s timeslots and sends them to the GEIUT

    through the GTNU in the same subrack. The GEIUT multiplexes the 64 kbit/s timeslots into 16

    kbit/s timeslots and sends them to the GTCS through the Ater interface.

    The GEIUT in the GTCS demultiplexes the received 16 kbit/s timeslots into 64 kbit/s timeslots and

    sends them to the GDPUC through the GTNU in the GTCS. The GDPUC performs voice

    transcoding and rate adaptation on the timeslots and then sends them back to the GTNU. TheGTNU switches the timeslots to the GEIUA, which sends the timeslots to the MSC through the A

    interface.

    G

    T

    N

    U

    G

    E

    I

    U

    T

    G

    T

    N

    U

    G

    E

    I

    U

    T

    G

    E

    I

    U

    A

    MSC

    E1/T1 cable

    TDM switching

    on the backplane

    GTCSGMPS/GEPS A interface

    Front board

    Rear board

    G

    D

    P

    U

    C

    G

    E

    I

    U

    B

    BTS

    Abisinterface

    PS Service Signal Flow

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    PS service:

    The PS data signal is sent to the GEIUB board in the GMPS/GEPS through the Abis

    interface. The call uses one to four 16 kbit/s timeslots on the Abis interface according to

    CS14 or MCS19.

    The GEIUB demultiplexes the timeslots into 64 kbit/s timeslots and sends them to the GTNU,

    which switches the 64 kbit/s timeslots to the GEIUP.

    The GEIUP multiplexes the timeslots into 16 kbit/s timeslots and sends them to the PCU

    through the Pb interface. Then, the timeslots are sent to SGSN through the Gb interface.

    G

    T

    N

    U

    G

    E

    I

    U

    P

    SGSN

    E1/T1 cable

    Backplane TDM switching

    GMPS/GEPS Pb

    interface

    Gbinterface

    Front board

    Rear board

    G

    E

    I

    U

    B

    BTS

    Abisinterface

    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

    SC

    U

    G

    EI

    U

    T

    G

    TN

    U

    G

    EI

    U

    T

    G

    EI

    U

    A

    MSC

    The signals are processed through the MTP2, andthen sent to the GXPUM in the mode of internal

    signaling flow

    GTCSGMPS/GEPS Ater

    interfaceAinterface

    E1/T1 cable

    GE switching on the backplane

    TDM switching on the backplaneFront board

    Rear board

    Signaling Signal Flow on the Abis Interface

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    G

    X

    P

    U

    M

    G

    SC

    U

    G

    E

    I

    U

    B

    BTS

    E1/T1 cable

    GE switching on the backplane

    TDM switching on the backplane

    The signals are processed through the LAPD,

    and then sent to the GXPUM in the mode of

    internal signaling flow

    GMPS/GEPS Abisinterface

    Front board

    Rear board

    Signaling Signal Flow on the Ater Interface

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    G

    X

    PU

    M

    G

    SC

    U

    G

    E

    IU

    T

    G

    S

    C

    U

    G

    E

    IU

    T

    The signals are processed through theMTP2, and then sent to the GXPUM in themode of the internal signaling flow

    GTCSGMPS/GEPS Aterinterface

    The signals are processed through the

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

    E1/T1 cable

    GE switching on the backplane

    TDM switching on the backplaneFront board

    Rear board

    Signaling Signal Flow on the Pb Interface

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    G

    X

    PU

    M

    G

    S

    CU

    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

    GE switching on the backplane

    TDM switching on the backplaneFront board

    Rear board

    System Signal Flow

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    Voice service

    BTSGEIUBGTNUGEIUTGEIUT GTNUGDPUCGTNUGEIUAMSC

    PS service:BTSGEIUBGTNU GEIUPPCU

    SS7 on the A Interface

    MSCGEIUAGTNUGEIUTGEIUTGSCUGXPUM

    Signal signaling flow on the Abis interface

    BTSGEIUBGSCUGXPUM

    Signal signaling flow on the Pb interface

    PCUGEIUPGSCUGXPUMGSCUGEIUB

    SS7 on the Ater interface

    GSCUGEIUTGEIUTGSCUGXPUM

    Board in The GMPS/GEPS

    Board in the GTCS

    O&M FlowHDLC link

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    Service

    boardGS

    C

    U

    G

    E

    I

    U

    T

    Main GTCSRemote

    G

    S

    C

    U

    G

    E

    I

    U

    T

    E1/T1 cable

    GE switching onthe backplane

    Network cable

    GMPS

    Ater

    interface

    G

    S

    CU

    L

    M

    T

    G

    B

    A

    M

    Service

    board

    Service

    board

    GEPS Main GTCSLocal

    G

    S

    CU

    Service

    board

    O&M Flow

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    O&M path of the GMPS

    LMTGBAMGSCUboards of the GMPSO&M path of the GEPS

    LMTGBAMGSCUinter-subrack interconnection cableGSCUboards of the GEPSO&M path of the GTCS

    LMTGBAMGSCUGXPUMGSCUGEIUTHDLCGEIUTGSCUboards of theGTCS

    O&M path of the BTS

    LMT

    GBAM

    GSCU

    GXPUM

    GSCU

    GEIUB

    BTS

    Board in The GMPS/GEPS

    Board in the GTCS

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    Chapter 3 System Principle

    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 process of loading has the following two phases:

    BOOTP phase: A board obtains its IP address, software loading control mode, and program

    software by sending a Bootstrap Protocol (BOOTP) request.

    LOAD phase: A board obtains its data files and other files.

    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 (Remote GTCS)

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    GEPS GTCS

    GTCSGMPS

    E

    I

    U

    T

    GBAM

    GSCU

    EIUT

    G

    S

    C

    U

    G

    SCU

    GSCU

    GMPS

    Main Remote GTCS

    extension GTCS

    GEPS

    GE on the backplane

    HDLC

    Inter-subrack Cable

    Service

    board

    Service

    boardServiceboard

    Servi

    ceboard

    Software Loading Path (GTCS at Local)

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    GBAM

    GSCU

    GMPS

    Main GTCS

    extension GTCS

    GEPS

    GE on the backplane

    Inter-subrack Cable

    GMPS

    Service

    board

    GEPS GTCS

    GS

    CU

    GS

    CU

    Service

    board

    Service

    board

    GTCS

    G

    S

    C

    U

    Service

    board

    Loading Software to the GSCU Board

    Th f th ft l di f th GSCU i f ll

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    The process of the software loading for the GSCU 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

    After the software of the GSCU is loaded the loading of the software for the other boards in the

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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 physicaladdress 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

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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

    The GSCU in the main GTCS on the MSC side is a second-level loading control center. The

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    The GSCU in the main GTCS on the MSC side 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 (see the next page)

    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.

    Loading the GSCU Software in the Remote GTCS After the local GEIUT board starts up, it sets up a HDLC link to the remote GEIUT.The process of

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    te t e oca G U boa d sta ts up, t sets up a C to t e e ote G U e p ocess o

    loading the GSCU software in a GTCS is as follows:

    1. After the local GEIUT starts up, it sets up a Ater O&M link to the remote GEIUT.2. The remote GEIUT sends a BOOTP request to the GSCU in the same subrack.The GSCU

    cannot process the request before its startup.

    3. The remote GEIUT sends a BOOTP request on the Ater O&M link.

    4. The local GEIUT receives the BOOTP request on the Ater O&M link and broadcasts the

    request on the GE ports over the local subrack.

    5. The GSCU in the GMPS receives the BOOTP request, responds with a message, processes

    the request, and then loads the software to the remote GEIUT on the Ater O&M link.

    6. The remote GSCU after power-on sends a BOOTP request to the GSCU in the GMPS

    through the HDLC link.

    7. The transmission of the BOOTP request varies:

    If the Ater O&M link is normal, the BOOTP request is sent to the GSCU in the GMPS.

    On receiving the request, the GSCU loads the software to the remote GSCU.

    If the Ater O&M link is broken, the BOOTP request cannot be sent to the GSCU in theGMPS. The GSCU in the main GTCS at the remote end starts up from its flash memory

    and acts as a remote loading control center. When the Ater O&M link goes back to the

    normal state, the remote loading control center stops processing the BOOTP requests

    from the other boards in the remote GTCS.

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    Chapter 3 System Principle

    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 togenerate visual and audio indications.

    The user performs alarm box management, such as terminating alarm sounds and disabling

    alarm indicators.

    Alarmmanagement

    module

    GBAM Alarm box

    Convert

    LMT

    Report of Alarm from Local Subrack

    The report process of alarm from local subrack:

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    p p

    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.

    The alarm box is driven through the Convert module of LMT, and then outputs the alarm.

    GMPS

    GSCUGBAM

    LMTConvert

    Alarm box

    GEPS

    GSCU

    Serviceboard

    Serviceboard

    Report of Alarm from Remote Subrack

    The report process of alarm from remote subrack is shown as follows:

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    The service board of remote subrack generates alarm.

    The alarm is shielded and filtered on the service board.

    The alarm is transferred to the local GEIUT through the GE switching, and then sent to the

    GEIUT of main subrack through the SS7 of the Ater interface.

    The local GEIUT reports the alarm to the GBAM through GE switching.

    The GBAM reports the alarm to LMT/EMS and records alarm log.

    The alarm box is driven through the Convert module of LMT, and then outputs the alarm.

    GMPS

    GEIUT GSCU

    GBAMLMT

    Convert

    Alarm box

    GTCS

    GEIUT

    Service

    board

    Report of Alarm from BTS

    Report process of alarm from BTS

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    The BTS generates alarm that is shielded and filtered in the BTS.

    The alarm is sent to the local EIUB through the OML. After processed through the LAPD

    protocol on the EIUB, the alarm is sent to the GBAM through GE switching.

    The GBAM reports the alarm to LMT/EMS and records alarm log.

    The alarm box is driven through the Convert module of LMT, and then outputs the alarm.

    GMPS

    GEIUB GSCUGBAM

    LMTConvert

    Alarm 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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    Chapter 1 System Description

    Chapter 2 Hardware Structure

    Chapter 3 System Principle

    Chapter 4 Typical Configuration

    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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    /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.

    Configuration Principles

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

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    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.

    Configuration Principles

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

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    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:

    SC f

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    The BSCsupports 256TRX full

    rate/128TRX 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

    N+1 redundancy.

    The EUIP is configured optionally

    according to actual services.

    The GXPUC is configured

    optionally according to the actual

    services.

    Typical Configuration

    Capacity of this configuration:

    Th BSC t 512TRX f ll

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    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

    The capacity of this

    configuration The BSC

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    configuration: The BSC

    supports 1024TRX fullrate/512TRX half rate.

    The EIUB is configured according

    to the number of BTS and the

    number of carrier.

    Based on service capacity, the

    GDPUC is configured through

    N+1 redundancy

    The EIUP 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.

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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

    Dec 31 2006 Internal Use (Only)

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    HUAWEI TECHNOLOGIES Co., Ltd.

    www.huawei.com

    HUAWEI Confidential

    GSM BSSTraining Team

    Thank You

    www.huawei.com

    Switch of Voice Signal

    The basic voice signal flow should be switched nine times. If every call connection performs nine-switch,

    it costs long time and affects connection speed.

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    g p

    The nine-switch is categorized into three types: Switch on the GDPUC

    The switch is set up when the board is initialized, which need not to be modified.

    Switch on the GEIUx

    The switch is set up according to data configuration after the board is initialized. That is to say, the

    switch should be set up after the board receives data configuration. The switch can be modified if

    the data configured is changed. Switch on the GTNU

    The switch is set up in every call connection course.

    G

    EI

    UB

    G

    EI

    UT

    GTNU

    G

    EI

    UT

    G

    EI

    UA

    GTNU

    G

    DP

    UC

    DSP

    Pick-Up of Voice Signal

    During accessing MS, when a MSC receives an assignment request, the BSC distributes a TCH

    channel to the carrier that bears the MS and detects the CIC of this call distributed by the MSC

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    channel to the carrier that bears the MS and detects the CIC of this call distributed by the MSC.

    Set up a path of the TC subrack. Distribute an idle DSP in the TC subrack where the CIC is. In

    addition, distribute an idle Ater interface timeslot (16K). Then build the switch between the CIC

    and the DSP and the switch between the DSP and the Ater.

    The connections of E1 cables between the BM subrack and the TC subrack through the Ater

    interface are determined by the data configuration. When Ater interface timeslot is distributed

    in the TC subrack, the Ater interface timeslot in the corresponding BM subrack is confirmed.

    Then, set up the switch between the Ater and the Abis, which may cross the BM subrack.

    Signal Flow of Cross-Subrack Call

    Cross-subrack call: The switchof voice signal between two BM subracks is called cross-subrack

    call.

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    G

    E

    I

    U

    T

    G

    E

    I

    U

    B

    G

    E

    I

    U

    T

    G

    X

    P

    U

    M

    G

    E

    I

    U

    T

    G

    E

    I

    U

    A

    G

    D

    P

    U

    C

    Description of user plane cross-subrack call: For a call, the subrack that bears the Abisinterface is determined by the carrier that accesses users; the subrack that bears the A interface

    and the subrack that bears corresponding Ater interface are distributed by the MSC. Thus, the

    switch cannot be performed in a same subrack.

    VoiceSignal Flow

    Signaling Signal Flow

    Signal Flow of Cross-Subrack Call

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

    The user plane cross-subrack and control plane cross-subrack are independent.

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    G

    E

    I

    U

    B

    G

    E

    I

    U

    T

    G

    X

    P

    U

    M

    G

    E

    I

    U

    T

    G

    E

    I

    U

    A

    G

    D

    P

    U

    C

    G

    E

    I

    U

    T

    G

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    P

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    M

    p p p

    VoiceSignal Flow

    Signaling Signal Flow