BSC6900V900R011 GO Hardware Structure and System Description

7/27/2019 BSC6900V900R011 GO Hardware Structure and System Description

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Security Level: Internal Use

www.huawei.com

2009/06

BSC6900V9R011 GO

Hardware Structure

and SystemDescription

TSD Wireless Product Service Department-GBSS

ISSUE1.0



HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

The BSC6900 is an important network

element of Huawei Single RAN solution. It

adopts the industry-leading multiple radio

access technologies, IP transmissionmode, and modular design. The BSC6900

can be flexibly configured as a BSC6900

GSM, BSC6900 UMTS, or BSC6900 GU

as required in different networks.




Know the functions and features of BSC6900

Master the hardware structure of BSC6900

Master the signal flow

Master the typical configuration of BSC6900




Reference

BSC6900 Technical Description

BSC6900 Hardware Description




Chapter 1 BSC6900 System Description

Chapter 2 BSC6900 Hardware Structure

Chapter 3 BSC6900 Signal Flow

Chapter 4 BSC6900 Typical Configuration




Location

The interfaces between the BSC6900 GSM and each NE

in the GSM network are as follows:

Abis Interface: the interface between the BTS and BSC A Interface: the interface between the BSC and MSC or MGW

Gb Interface: the Interface between the BSC and SGSN


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• Smooth evolution from BSC to RNC with software upgrade

• Reducing CAPEX by reusing hardware

• Dynamic capacity adjustment between 2G&3G

Software

upgrade

BSC6900 Product Characters－multi-

mode amalgamation

BSC

BSC

RNC

RNC

RNC

BSC

GSM&UMTS cabinet GSM&UMTS co-cabinet

RNC

RNC

BSC




BSC6900 Capacity Index

BSC6900 GSM only

Item 1MPS+1TCS 1MPS+1EPS+2TCS 1MPS+2EPS+2TCS

Number of cabinets

2 2 2

BHCA 1750 3500 5250

Traffic volume

（Erl）

6500 13000 19500

Number of TRXs 1024 2048 3072

Number of active

PDCHs（MCS-9）

4096 8192 12288

Typical configuration specifications of the BSC6900 GSM(BM/TC

separated and Abis over non-IP R11 board)












2.1 Frame and Subrack

2.2 Board Introduction

2.3 Cable Introduction




BSC900 Hardware--Cabinet

The BSC6900 uses the Huawei N68E-22 cabinet and the Huawei

N68-21-N cabinet.

The two models of cabinets have the same appearance.N68E-22 is

divided into a single-door cabinet or a double-door cabinet.




BSC900 Hardware--Cabinet

The BSC6900 GSM cabinet is classified into

main processing rack (MPS), extended

processing rack (EPS), and transcoder rack

(TC).




BSC900 Hardware--Subrack

The BSC6900 GSM subrack has a standard width of 19 inches. The height

of each subrack is 12 U. The boards are installed on the front and rear sides of the backplane, which is positioned in the center of the subrack.

A subrack provides 28 slots. The slots on the front of the subrack are

numbered from 0 to 13, and those on the rear are numbered from 14 to 27.




BSC900 Hardware--Subrack

1 Fan box 2 Mounting ear 3 Guide rail

4 Front cable

trough

5 Boards 6 Grounding

screw

7 DC power

input port

8 Port for the

monitoring signal

cable of the power

distribution box

9 Cover plate

of the DIP

switch

Front ViewRear View

Classification of BSC6900 GSM subracks

Item Index

Height of the subrack 12U

Weight of the subrack Empty: 25kg;

Full configuration≤57kg

Consumption l MPS subrack: 1000W

l EPS subrack: 1000W

l TCS subrack:1000W




DIP Switch on the Subrack The DIP switch on the subrack has eight bits numbered in ascending

order from 1 to 8

If the bit is set to ON, it indicates 0. If the bit is set to OFF, it indicates 1.




DIP Switch on the Subrack

Subrack

number

Subrack code

1 2 3 4 5 6 7 8

Subrack 0 ON ON ON ON ON ON ON OFF

Subrack 1 OFF ON ON ON ON OFF ON OFF

Subrack 2 ON OFF ON ON ON OFF ON OFF

Subrack 3 OFF OFF ON ON ON ON ON OFF

Subrack 4 ON ON OFF ON ON OFF ON OFF

Subrack 5 OFF ON OFF ON ON ON ON OFF











BSC6900 Overall Structure The overall structure of the BSC6900

Switching Subsystem;

Service Processing Subsystem;

Clock Synchronization Subsystem;

Interface Synchronization Subsystem;

OM Subsystem.

GO-Mode




Switching Subsystem Functions

Provides intra-subrack Medium Access Control (MAC) switching

Provides intra-subrack Time Division Multiplexing (TDM) switching

Distributes clock signals to the service processing boards

Provides inter-subrack switching

Provides switching channels for traffic data

Provides OM channels

Hardware Involved

TDM switching－ TNUa board

MAC switching－ SCUa board




Board——TNUa

Port FunctionMatching

connector

TDM0～5TDM high-speed serial port, used to connect

the TNUaS between subracks

DB14

GTNU

PARC

RUN

ALM

ACT

T N M

5

T N M 4

T N M 0

T N

M 1

T N M 2

T N M 3

The TNUa is the TDM switching unit in the BSC6900.

The active and standby TNUa are inserted in slot 4 and slot 5.

The TNUa board performs the TDM switching function, which

is the TDM switching center of the system.

The TNUa has the following functions:

Providing 128 K×128 K TDM switching

Allocating TDM network resources, establishing, and releasing

radio links




Board——SCUa

Port Function Matching

EHT0～9 10M/100M/1000M Ethernet ports, used to connect subracks RJ45

EHT10～11 10M/100M/1000M Ethernet ports, used to connect GBAM (Only themain subrack is connected with the GBAM)

RJ45

COM Debugging port 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 SCUa is the switching control unit in the BSC6900.

The active and standby SCUa are inserted in slot 6 and 7.

The SCUa board provides maintenance management of the

subrack and GE switching platform for the subrack.

The SCUa 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 GCUa

SCUa

PARC

RUN

ALM

ACT

C O M

TESTOUT

C L

K I N

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




Service Processing Subsystem Functions

User data transfer

Radio channel ciphering and deciphering

System admission control

Data integrity protection

Mobility management

Cell broadcast service control

Data volume reporting

Radio access management

CS service processing

PS service processing

Radio resource management and control

System information and user message tracing




Service Processing Subsystem

Hardware Involved

XPUa/b board, SPUa/b board, DPU/c/d board

Board Specification

XPU/SPU is the signaling processing unit

SPU board can process GSM/UMTS signaling panel, XPU board can process

GSM signaling panel

SPU board Works for BSC6900 GU mode

XPU board Works for BSC6900 GSM only mode

Services Process Unit DPUc/d/




Board Introduction-XPU/SPU

Loaded with different software, the XPUa board is functionally

divided into main control XPUa board and non-main control

XPUa board.

XPUa

PARC

RUN

ALM

ACT

1 0 / 1 0 0 / 1 0 0 0 B A S E -

T

ACTLINK

0

1

2

3

The 0 subsystem of main control XPU/SPU

board is MPU, used to manage the user panel

and signaling plane resources within the

subrack and process the signaling.

The subsystem of non-main control XPU/SPU

board is CPU, used to process the signaling.

Main control

XPUa

Non-Main

control XPUa




Board Introduction——DPUc

Function

DPUc process CS services and perform the voice coding and

decoding function. It works as subrack system pool mode.

Provides the speech format conversion and data forwarding

functions when configured in BM subrack.

Provides the voice enhancement function

DPUd board works for GSM services.

DPUa

PARC

RUN

ALM

ACT




Board introduction——DPUd

Function

The DPUd is the Data Processing Unit for PS services. It can be

installed in slots 8 –11 in MPS and 8-27 in EPS，it processes the

packet services for the BSC.

Each DPUd supports 1024 activated PDCHs at the same time,

and all the PDCHs support MSC-9 coding. Packet links processing function.

PS fault self-detection.

DPUd board works for GSM services.

DPUa

PARC

RUN

ALM

ACT




Subsystems Five: Interface Board System

Board

Type

Physical

Board

Board specification Scene

EIUa Transmits, receives, encodes, and decodes 32 E1s/T1s. GSM Only

OIUa Provides one STM-1 port for TDM transmission GSM Only、GU

Old

Boards

FG2a Provides eight channels over FE ports or two channels over

GE electrical ports

GSM Only、GU

GOUa Provides two channels over GE optical ports GSM Only、GU

PEUa Provides 32 channels of E1s/T1s for HDLC transmission

Extracts line clock signals

GSM Only、GU

Multi-

kernel

Boards

FG2c Provides 12 channels over FE ports or four channels over

GE electrical ports GSM Only、GU

GOUc Provides four channels over GE optical ports GSM Only、GU

POUc Provides four channels over channelized optical STM-1/OC-3 ports based on IP protocol

GSM Only、GU




Board Introdction-FG2c

The FG2c board supports IP over Ethernet transmission.

The FG2c board performs the following functions: Provides 12 channels over FE ports or four channels over GE

electrical ports

Provides the link aggregation function at the MAC layer

Provides the routing-based backup and load sharing

Supports the transmission of data over all its Ethernet ports on the

basis of the synchronized clock signals

Supports the Abis、 A、Gb、Iu、Iub interfaces

Port Function Connector type

10/100BASE-T 10M/100M Ethernet ports, used to transmit 10/100M

signals

RJ45

10/100/1000BASE-T 10M/100M/1000M Ethernet ports, used to transmit

10/100/1000M signals

RJ45

2M0、2M1 Port for 2 MHz clock signal outputs male connector




Board Introduction-GOUc

As an optical interface board, the GOUc board supports IP

over Ethernet transmission.

The GOUc board performs the following functions:

Provides four channels over GE optical ports

Provides the routing-based backup and load sharing


Supports the Abis, A, and Gb,Iu, Iub interfaces

Port Function Connector

Type

RX Optical port, used to transmit and receive optical signals. TX

refers to the transmitting optical port, and RX refers to the

receiving optical port.

LC/PC

TX

2M0、2M1 Port for 2 MHz clock signal outputs SMB male

connector




Board Introduction-POUc

As an interface board, the POUc board supports IP over

channelized STM-1/OC-3 transmission. The POUc board performs the following functions:

Provides four channels over channelized optical STM-1/OC-3 ports based

on IP protocol

Supports the PPP function


Provides the Automatic Protection Switching (APS) function between the

active and standby POUc boards

Supports the A, Abis, Gb, Ater,Pb, Iu, Iub interfaces


RX Optical port, used to transmit and receive optical signals. TX refers to the

transmitting optical port, and RX refers to the receiving optical port.

LC/PC

TX

2M0

2M1

Output ports for clock signals. These ports are used to transmit the 2 MHz line

clock signals to the GCUa/GCGa board. The clock signals are extracted from

upper-level devices and serve as the clock sources of the BSC6900 system.

SMB male

connector




Subsystems Four: Clock Subsystem Clock Source

Bits clock

Line clock

GPS

Reference Clock for the MPS or EPS

The reference clocks are provided by the GCUa. The reference clocks generate

8kHz clock signals through the GCUa.

MPS: The clock signals are sent to the SCUa in the MPSa subrack through the

backplane. Then, the clock signals are sent to other boards in the same subrack.

EPS: The clock signals are sent to the SCUa board in the EPSa subrack through

the clock cable. Then, the signals are sent to other boards through the backplane.

Reference Clock for the TCS Each TCS extracts line clock from the A interface. The line clock is processed

through A interface panel and then generates 8 KHz clock signals.

The clock signals are sent to the SCUa in the subrack through the backplane. Then

the clock signals are sent to other boards in the same subrack.




Board——GCUa

GGCU

PARC

RUN ALM ACT

8

9

COM0

COM1

0

1

2

3

4

5

6

7

C L K O U T

T E S T I N

T E S T O U T

C L K L I N 1

C L K L I N 0

The GCUa is the general clock unit in the BSC6900. The active and

standby GCUa are configured in slots 12 and 13 in the MPS. The

GGCU board provides synchronous timing signals for the system

The GCUa has the following functions:

Generating and keeping synchronous clock signals

Keeping the consistency of synchronization information output from the active

and standby GCUa


ATN-IN Reserved SMA male connector

CLKOUT0~9

Ports for transmitting synchronization clock signals. The ten

ports are used to transmit the 8 kHz clock signals to the

CLKIN port on the panel of the SCUa board.

RJ45

COM0,COM1 Reserved RJ45

TESTOUT Reserved SMB male connector

TESTIN Input port for testing external clock signals SMB male connector

CLKIN0-1Synchronization clock input port, used to receive the 2.048

MHz clock signals or 2.048 Mbit/s code stream signals

SMB male connector




M2000

S

C

U

a

S

C

U

a

LANSWITCH

OM

U

a

OM

U

a

SC

U

a

SC

U

a

WEB LMTExternal

network

MPS

Internal

network

EPS

Internet cable

Serial cable

Subsystems Five: O&M Subsystem

B d I d i OMU




Board Introduction—— OMU The OMUa board works as a bridge for the communication

between the WebLMT and the other boards in the BSC6900.

Function

Performing the configuration management, performance

management, fault management, security management, and loading

management functions for the system

To control the communication between the LMT/M2000 and the SCUaboard of the BSC6900

(1) Captive screw (2) Shielding finger (3) Ejector lever (4) LED (RUN)

(5) LED (ALM) (6) LED (ACT) (7) Button (RESET) (8) Button

(SHUTDOWN)

(9) USB port (10) Ethernet port (ETH0) (11) Ethernet port (ETH1) (12) Ethernet port

(ETH2)

(13) COM port (14) VGA port (15) LED (HD) (16) LED(OFFLINE)

(17) Hard disk (18) Screw for fixing the hard disk











TNUa

（Active）

Board

Board

LVDS TDM path of backplane

Inter-TNUa Cable

TNUa

（Standby）

TNUa（Active） Board

Board TNUa（Standby）

TDM Switching Subsystem Intra-Subrack: Other boards in the subrack connect with TNUa

(Active/Standby) through LVDS (Low Voltage Differential Signal) high

speed serial ports of backplane.

Inter-Subrack: TDM units of every subrack fully interconnected with

each other through TNUa crossover cables.

In full intra-subrack

interconnection, 2 cables

support 8K bandwidth.

Inter Subrack Interconnections of




Inter-Subrack Interconnections of

TNUa Crossover Cables

1＃

0＃ TNUa TNUa

TNUa TNUa

2＃ TNUa TNUa




Interconnection Between SCUa Active/standby SCUa boards: HiG interconnection; 30G bandwidth.

Intra-subrack : The SCUa board provides 48G GE switching capabilitythrough backplane.

Inter-subrack : The SCUa boards are connected in star topology

through intercross cable using the GE ports on SCUa.

Switchin

g and

control

unit

Other board

Other board

Other board

Other board

Other board

Other board

Switchin

g and

control

unit

Switchin

g and

control

unit

RSS

RBS

RBS

High-speed

backplane channel Network cable




The Physical Cable Between Subracks SCUa in MPS subrack

GE0～7 interconnect with EPS, open the port by MML command.

SCUa in EPS subrack

GE0～1 interconnect with MPS




Clock Synchronization Interconnection

The connection of the GCUa of the main

subrack and the extension subrack isshown:

The active and standby GCUa output 10-way

signal channel respectively. A signal channel of

an active GCUa and that of a standby GCUa

are integrated through the Y-shaped cable. Any of component including GCUa, Y-shaped

cable, and SCUa is faulty, the system clock

still can work normally.











GSM CS Signal Flow

Abis over TDM+A over TDM




GSM CS Signal Flow Abis over IP+A over TDM




GSM CS Signal Flow

Abis over TDM+A over IP

Abis over IP+A over IP




GSM PS Signal Flow (Inner-PCU) Abis over TDM

Abis over IP




Signaling Flow on the A Interface Abis over TDM+A over TDM

the signaling processing board XPUa processes the signalingaccording to the MTP3, SCCP, and BSSAP protocols.




Signaling Flow on the Abis Interface Abis over TDM/IP/HDLC




Signaling Flow on the Gb Interface

Gb Over IP

the signaling processing board processes the signalingaccording to the NS and BSSGP protocols. Then, the signaling

is transmitted to the Gb interface board through the SCUa

board.

The Gb interface board processes the signaling according to

the IP or FR protocol. Then, the signaling is transmitted to the

SGSN over the Gb interface.




OM Signal Flow








S ifi ti f th B d




Specification of the Board

XPUa/XPUb

350TRX/XPUa 640TRX/XPUb

No. of XPUa=TRX No./350TRX No. of XPUb=TRX No./640TRX

Typical




Typical

Configuration

Parameter Description

Typical




Typical

Configuration Parameter Description



谢谢

www.huawei.com

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BSC6900V900R011 GO Hardware Structure and System Description