ZXC10-BSC Sub-System

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ZXC10-BSC Sub-System

2004.10.3


Lesson Objectives: General Study HIRS:High-speed Interconnection Routing Subsystem

SVBS:Selector Vocoder Bank Subsystem

PCFS:Packet Control Function Subsystem

CPS:Call Processing Subsystem

CDSUS:Channel Data Service Unit Subsystem

TS:Timing Subsystem

Subsystems of BSC


General Study• BSC working environment requirement Working temperature: 0°C ~+55°C Working humidity: 15%~93% The density of dust in the equipment room with diameters of over 5μm sh

ould be ≤3*104 granules/m3.

• Power requirement • BSC DC power • 1)Voltage amplitude: The nominal voltage value of the BSC power supplied

by the power equipment in the equipment room is -48V. The permitted variation range is -57V~-40V.

• 2)The noise level index contained in the DC power voltage should satisfy the requirement in the overall technical specifications by the former MPT.

3)DC power should provide over-voltage


BSC Mechanical Structure--Center Rack

HIRS

CDSUSCPS

TS


BSC Mechanical Structure--Vocoder Rack

SVBSor

PCFS


Mechanical Features• BSC comprises the central rack and the vocoder rack. • The central rack and the vocoder rack adopts the unified

racks and standard plug-in boxes, which provide different functions due to the use of different plug-in unis.

• External dimensions of the rack (main body) (H*W*D): 2000 mm*810 mm*600 mm

• Outline dimensions of rack (after installation of top shelf and side board) (H×W×D): 2200mm×870mm×600mm

• From top to bottom, each rack includes one distribution plug-in box, 3~5 functional plug-in boxes, one fan plug-in box, and dust-proof shelf. There are three types of functional plug-in boxes.


HIRS Subsystem is switching center and packet data exchange platform of BSC.

Functions of HIRS ： Packet data switching Timing distribution ， monitor GPS Software downloading Operation and maintenance management on the whole BSS

HIRS


HIRS Shelf StructurePSMB

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NCM

NCM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

NIM

PSMB

NCM: Network Control Module

NIM: Network Interface Module

PSMB ： Power Supply Module


Input and Output interface

Operate and maintain interface

HIRS Subsystem

RS422 interface Clock interface


NCM is the core module in HIRS shelf When NCM is in slot 11,it must connect with port 6 of NIM in slot 9 via the internal serial bus on backplane.

When NCM is in slot 12,it must connect with port 6 of NIM in slot 14 via the internal serial bus on backplane.

2 NCM working mode: active and standby

NCM


Major functions of NCM : Gateway function:data receiving of CO bus and distribution of DIS bus,routing of data frame inside/outside of the local shelf Distribution of software of respective modules and configuration information; Fault detection, isolation, report and recovery in HIRS network; GPS clock distribution; Serving as the foreground PC of BSM to communicate with the background through 10/100Mbps Ethernet

NCM Functions


NCM Panel Indicator&Interface`Indicator:

RUN:when module normal running,it quick flashALM:OFF indicates no faultACT:Active/Standby State

Interface:TEST:Network interface,for debugging but not connected in operationsRS-232:serial port, for debugging but not connected in operationsRST:Manual resetting on boardsM/S:Manual Switching active/standby mode on the foreground


Receive/send RS-422 serial data

Receive/send data through DISCO

8 ＋ 1 redundancy

Clock receiving and distributing

Reports module working states to NCM via I2C bus and accepts NCM control

NIM Functions


NCM

NCM

2 3 4 5 6 7 8 9 10 13 1514 16 17 1918 20 2111 12

0 1 2 3 4 5 6 7 9 11 12 13 14 158

０123

4567

Node address10

PortNumber

Slot No.

NIM StandbyConfiguration DirectionConfiguration Direction

Network address distribution


NCM

NCM

2 3 4 5 6 7 8 9 10 13 1514 16 17 1918 20 2111 12

NCM

NCM

2 3 4 5 6 7 8 9 10 13 1514 16 17 1918 20 2111 12

0 1 2 3 4 5 6 7 9 A B C D E F8

Node address

０12

3

45

67

Port address

Slot No.

CPM Network Address

BSSId = X ， SubNetId = 0 ， NodeId = 7 ， PortId

= 7 ；

NCM Network Address

BSSId = X ， SubNetId = 0 ， NodeId = 7 ， PortId = 6 ；

Network address distribution(Cont.)


NIM daisy chainNIM :8 working + 1 standby and changeover

NI

M

0 1 2 3 4 5 6 8 9 10 11 12 13NCM N

IM

7 backup 14 15backup


NIM Panel IndicatorNIM

RUNALMACT

RST

RUN: A green indicator, blinking when the board works normally.

ALM: A red indicator, lighting up or blinking in case of board failure.

ACT: A green indicator, lighting up when the board is in master mode.

RST: Reset button.


SVBS--Selector/Vocoder Band Subsystem SVBS is the core part for enabling voice services and supporting SS7 signaling MTP1 and MTP2.

Judge and implement soft handoff: select a path in several soft handoff path by the quality for code type conversion

Code type conversion function: It enables the conversion between 64K PCM codes and variable rate of QCELP codes;

Enables echo cancellation for PCM data on the forward link

Power control

Signaling handle


SVBS Shelf StructurePSMB

SVM

SVM

SVM

SVM

SVM

SVM

SVM

SVM

SVICM

SVICM

SVM

SVM

SVM

SVM

SVM

SVM

SVM

SVM

PSMB

SVICM: Selector Vocoder Interface Control Module

SVM: Selector Vocoder Module

PSMB ： Power Supply Module


Input and Output interface

4*E1 interfaces connected with MSC

SVBS Subsystem

Connected with NIM via RS422 port


SVICM FunctionsS-HIRS:Communicate with HIRS Network

Distribute forward traffic and signaling （ SVMSVICM NIM ）Distribute reverse traffic and signaling (SVMSVICM NIM ）Distribute signaling interior SVBS （ SVMSVICM ）

Receive and Distribute Clock and TOD messageManage and control SVMSignaling handlingCode type conversion between MSC and BSS via DTI


NIM

SVICMU

gateway

SVCSVM

1SVM

7SVM

8

CODISC_BUS

SVBS

DTI

MSC

时钟

I2C

Clockdistribution

RS422

4*E1

4*HW

Structure of SVICM


SVICM Panel IndicatorRUN: Running indicator (green), blinking during operation; ALARM: Alarm indicator (red), lighting up when a software error occurs; DT0: 1st E1 connection indicator, lighting up to indicate that the E1 link is connects; DT1: 2nd E1 connection indicator, lighting up to indicate that the E1 link is connects; DT2: 3rd E1 connection indicator, lighting up to indicate that the E1 link is connects; DT3: 4th E1 connection indicator, lighting up to indicate that the E1 link is connects; RST: Reset button.

RUN

ALM

DT0

DT1

DT2

DT3

RST

TEST

RS232


transcoding between PCM and QCELP

reverse outer-loop power control

soft handoff

handle layer 3 of Abis interface and layer 2 of IS-95 signaling

assign the timeslot

SVM － Selector & Vocoder Module


A SVM contain 1 SVP and 15 SVEs. SVICM receive traffic data from the RS-422 port of NIM then forward to S

VM,SVP forward to SVE,SVE transcoding to PCM and send through HW,in other direction,SVE transcoding PCM to QCELP or EVRC,then send to SVP,then to SVICM,and then NIM.

Structure of SVM

HW interface

SVE1 SVE2

SVE15

Data Interface

maintenance bus

clock interface

SVP


SVM Panel Indicator

RUN: Running indicator (green), blinking during working normally;

ALARM: Alarm indicator (red), lighting up when a software error occurs;

RESET: Reset button.

SVM

ALM

RS232

RST

TEST

RUN


PCFS-Packet Control Function Subsystem Each BSC can support 10 PCFS subsystems.Each PCFS subsystem comprises 1 PCFIM board and 8 PCF boards.Each PCFS subsystem is connected with the PDSN via PCFIM board, and provides a 10M/100M self-adaptive physical Ethernet interface through the PCFIM board.Each PCFS subsystem can carry 4000 PPP connections (Dormant+Active), and 240 activated PPP connections (total number of active ones).


PCFS FunctionsTo Select a service path with best quality among multiple soft handover paths for data GRE encapsulation.

Enables adaptation between GRE data packets and RLP data packets;.

To establish, configure and maintain A8 and A10 links via A9 and A11 interfaces.

To establish PPP link between MS and PDSN to enable packet data service transmission.


PCFS Shelf Structure

PCF

PCFIM

PSMB

PSMB

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCF

PCFIM

PCF

PCF

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


Input and Output Interface

PCFS provides a 10M/100M fast Ethernet interface to be connected with PDSN.PCFS provides a RS422-port to be connected with HIRS switching network.


CPS is a joint point of BSS system’s resource management and call signaling protocol processing.

CPS comprises two modules:CPM and PAM.

CPS-Call Processing Subsystem


CPS BoardPSMB

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CPM

CPM

PAM

GPSTM

TCM

GPSTM

PSMB


Handle the signaling of Abis interface

Radio resource maintenance,management and distribution

Trunk resource management

provides A signaling interface. It fulfills A interface startup and re-startup, A interface protective switching, activation of failing data link, control of link labels, and delivery of A messages.

Control over loading of BSS;produce the message of A and ABIS interface:establish the signaling link to CCM and SVICM

Manage the database of BSS,include the parameters of BSS system,ground circuit resource,traffic channel resource,calling record,performances record,handoff record and so on.

CPS Functions


Input and Output interface of CPS

CPS Subsystem

NIM 7 port

RS422

RS485

Alarm box

RS485

Connect to power modules of seven racks


Hardware feature of CPMAccording to the software function of CPM,CPM should have the Hardware features below ：CPS sub-system is a joint point of BSS system’s resource management and call signaling protocol processing,processing all the signaling,so the CPM should be powerful.

The CPM is 1+1 hot standby


CPM Panel

RUN:running indication

ALM:error status indication

ACT:green,active status indication

M/S:active/standby switch

RST:reset

TEST1:Ethernet debugging interface

RUN

ALM

ACT

M /S

RST

TEST

Run indicator

Fault indicator

Active/standby indicator

Active/standby switching key

Reset key

Ethernet debugging interface


PAM Functionsmonitor the running status of the power supply modules in the BSC-side frames and the equipment room environment signals, including temperature, humidity, smoke, and so on.report the result to the background operation and maintenance console through the NCM for processing; provides duplex RS232 and RS485 interfaces for the connection of external monitoring devices and alarm box.


CDSUS--Channel Data Service Unit Subsystem

1. Convert signal between RS-422 interface and non-channelized E1,transfer signaling and traffic data between BSC and BTS.

2. BSC-CDSU and BTS-CDSU, have the same hardware structure


CDSU PanelRUN

ALM

DT0

DT1

RST

RUN Running

ALARM Alarm

DT0 Synchronization A

DT1 Synchronization B

RST Reset Button


ASM---In CDMA system, BSC communicates with BSC via ASM board to enable inter-BSC soft handoff. The communication link is connected to BSCs via E1 link. ---According to different bandwidth provided by the communication link, ASM board is classified into ASM board providing 2*E1 trunk and ASM board providing 4*E1 trunk.


TS--Timing SubsystemAccording to the CDMA standard,BSC and BTS independently synchronization the timing signal provided by GPS.

Timing subsystem provides such timing signal:*PP2S*16chips ： 19.6608MHz*TOD message


GPSTM

HIRS1

NCM

NCM

HIRS2

NCM

NCM

SVICM

SVICM

19. 6608MHz,10MHz, PP2S,

Tod

19. 6608MHz,10MHz, PP2S,

Tod

1. 2288MHz,PP2S, Tod

1. 2288MHz,PP2S, Tod

1. 2288MHz, PP2S, Tod, Tx_cl ock,

Rx_cl ock

1. 2288MHz, PP2S,8kHz, 2MHz, 50Hz,

Tod

NIM

NIM SVM

SVM

1. 2288MHz, PP2S, Tod, Tx_cl ock,

Rx_cl ock

1. 2288MHz, PP2S,8kHz, 2MHz, 50Hz,

Tod

BSC_CDSU

CPM

GPSTM

GPSTMBP

TCM

Timing distributing of BSC


TS Box

PSMB

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CDSU

CPM

CPM

PAM

GPSTM

TCM

GPSTM

PSMB


TCM FunctionsTCM board mainly provides the following functions:

1. It receives clock signals of active and standby GPSTMs;

2. It synthesizes and distributes 10MHz signals;

3. It receives 16CHIP and PP2S signals of active and standby GPSTMs;

4. It implements phase-lock on 16CHIP signal;

5. It generates new PP2S.


TCM PanelRUN green Lights up when the TCM works normally

ALM red Lights up when the TCM works abnormally

LOCK green Lights up when the TCM is locked

CLK: an SMA socket, used for monitoring of the TCM’s 16chip timing signal

PP2S: an SMA socket, used for monitoring of the TCM’s PP2S timing signal and for BS testing


GPSTM Function

GPSTM receives 1PPS signal from GPS receiver and generates PP2S signal, 16CHIP signal, 10MHz signal and TOD signal via phase-lock for the usage of the system. In case GPSTM cannot find the satellite, it provides the hold-over function. According to the specifications, the wander of the board should not be over 7ms in 24 hours; in this system, GPSTM implements less than 5ms wander in 4 days. GPSTM also implements active/standby automatic switching. It can detect and report board working states.

GPSTM TCM

16CH IP PP2S

Clock

Clock

10MHz or 12MHz10MHzFDM

GPSTM


GPSTM

Run indicator

Active/standby indicator

Indication of searching for satellite

RST

Fault indicator

Reset key

Power switch

16CHIP output

Indication of IPPS phase exceeding 800ns

CONTROL

GPSAIM

RUN

ACTIVE

1PPSAIM

AIM

CLK

PWR

RS232


The End

ZXC10-BSC Sub-System

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