Part2 System Architecture of MSC/VLR

The structure of MSC/VLR System The structure of MPM The structure of background Agenda

Overall system architecture MSC/VLR/SSP SC/VMHLR/AUC OMC-S Network management Charging centre NO.7 signal network BSS PLMN PSTN ISDN PSPDN PLMN PSTN ISDN PSPDN TCP/IP Q3X.25/DDN A 1.The structure of MSC/VLR System

Overall system architecture 1.The structure of MSC/VLR System

Center Switch Module (CSM) —Switching Network Module (SNM) —Message Switching Module(MSM) MSC/VLR Processing Module (MPM) Operation and Maintenance Module (OMM) Modularized System Structure 1.The structure of MSC/VLR System

MPM forms an independent exchange It provides the capacity of 60,000 subscribers. Flexible networking mode MPM No.7 OMM HLR BSC PSTN 1.The structure of MSC/VLR System

MPM MPM carry MPM 48*8M MPM It provides the capacity of 120,000 subscribers Flexible networking mode OMM Fiber 1.The structure of MSC/VLR System

CSM CSM carry MPM ( MPM is not more than 10) MPM 48*8M It provides the capacity of 600,000 subscribers. Flexible networking mode OMM …… 48*8M 1.The structure of MSC/VLR System

The function of CSM (1 ） SNM （ Switching Network Module ）： mainly realize the voice switching. The active/standby MP of SNM are connected with NT Server through Ethernet.This connection is created for the communication between OMM and foreground modules. （ 2 ） MSM （ Message Switching Module ）： mainly realize the message switching between modules. MPM are connected with SNM through FBI. The message from MPM will be sent to MSM through the semi-permanent connection between MSM and SNM. Then the MP of MSM will realize the message switching according to the route message 。 1.The structure of MSC/VLR System

The function of MPM MPM realizes the function of MSC/VLR ： main function of MSC ： (1)provide the interface of voice trunk and signaling link to BSS. (2)provide the interface to PSTN 、 PLMN etc. (3)support the message switching with VLR. (4)mobility management. (5)supplementary service (6)short message and IN service 1.The structure of MSC/VLR System

The structure of MSC/VLR System The structure of MPM The structure of background Agenda

MPM module rack Rack---Layer---Slot

MPM module rack

MPM rack board array diagram

T Network Unit 8Mb/s 16*8Mb/s MP0 2 Mb/s DT DTEC 8Mb/s ASIG COMM MP1 Digital Trunk Unit Analog signaling Unit Fiber Bus Interface Unit Control Unit FBI Switching Network Unit MPM Logical Structure Diagram

MPM is composed of the following units: Control unit Switching network unit Synchronous clock unit Digital trunk unit Analog signaling unit Fiber bus interface unit MPM Logical Structure Diagram

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

Control Unit a pair of active and standby module processor(MP) shared memory board(SMEM) communication board(COMM) monitoring board(MON) peripheral environment parameter detection(PEPD)

Control Unit

standby active working active standby MP working mode: active/standby Control Unit

2-level control mode in the MPM MP MONI Function units PEPD COMM Some boards Detect the environments Control Unit DT DTEC ASIG POWER,DSNI,FBI, SYCK SP temperature, humidity, smog, infrared

MP MPPP DDSN 256Kb/s Control Unit

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

Switching Network Unit 1)Realize the voice channel connection of the intra-module subscribers 2)Realize inter-module voice channel connections by connecting with the central switching network module. 3) Message communication between MP and the external units via a semi-permanent connection POWCPOWC FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI SYCKSYCK SYCKSYCK CKICKI DDSNDDSN DDSNDDSN DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI DSNIDSNI POWCPOWC

DDSN ( 16K×16K ) DDSN ( 16K×16K ) ……… Switching capacity ： 16K X 16K TS HW rate ： 8Mb/s (128TS) Total 128 8M HW DDSN

Switching network unit DDSN Work mode:active /standby DDSN unit can handle time slot switching of the voice channel. And control message channel Consists: 2 DDSN boards

Classification: MP level (DSNI-C) Interface between MP and T network. SP level (DSNI-S) Interface between SP and T network. DSNI (Digital Switching Network Interface) MP — COMM — DSNI-C — DDSN SP — DSNI-S — DDSN

Through DSNI-C to connect with COMM Boards Through DSNI-S to connect with Function Unit Self-looping testing Connect with ASIG Through FBI to connect with other modules DDSN HW Distribution

DSN DS NI 16*8M 8M HW*16 lines DDSN T-NET 16*8M DS NI 8M HW*16 lines 16*8M DS NI 4*8M COMM 2MHW HW Distribution

8MHW FBI 16*8M 8M HW*16 8M HW*6 8M HW*16 DDSN T-Net 5*8M 16*8M 6*8M ASIG 8MHW 8M HW*16 16*8M FBI ASIG HW Distribution

HWS Default Distribution of DDSN

Voice Channel Message Channel The voice channel and the message channel are separated. They go through different HWs. Dual-channel Structure

DT DSNI-S DT DSNI-S T NETWORK T NETWORK FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI FBIFBI ASIGASIG ASIGASIG …… Voice Channel A B TS1 TS2

MP DT DSNI-S … DT … … … DSNI-S T Network T Network HW4-19 HW20-35 HW36-51 HW52-67 DSNI-C HW0 HW1 HW2 HW3 COMM 2M … FBIFBI FBIFBI FBIFBI FBIFBI HW COMM 2M Message Channel

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

Synchronous Clock System Function: Received the reference clock from the superior exchange(DTI) or receive from BITS, and create synchronous clock to other parts. Including: 2 SYCK boards 1 CKI board

Synchronous Clock System function ： according to the reference clock to generate the synchronous clock for MPM. SYCK(synchronization oscillator) SYCK Working mode:Active/standby

CKI SYCK D S N I (MP) 8MHz/16MHz/8KHz D S N I ( SP) FBIFBI DDSNDDSN 16MHz/8kHz 8MHz/8KHz MP COMM MON 4MHz/8KHz DTU ASIG BITS External clock signal (DTI) 8MHz/8KHz Synchronous Clock System

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

Digital Trunk Unit PCM 2Mb/s A A DT B B The digital trunk unit is the interface unit between the digital switching system.

DTI PCM0 PCM1 Provide 120 voice channels PCM2 PCM3 One DT unit only has one DTI board One DTI board has 4 PCM (sub-unit) Digital Trunk Unit

DT Slot Number: 3n,3n+1 (n= 1,2,3….8) Digital Trunk Unit POWBPOWB DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI DTIDTI POWBPOWB

ZXC10-MSC/VLR has the echo elimination function integrated in the digital trunk board. It can cancel the echo in 2.048Mb/s PCM transmission network. That is, DTEC can realize all functions of DTI, at the same time it can complete function of echo cancellation. Digital Trunk Echo-canceling Unit (DTEC)

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

ASIG only exists in MPM (Not existing in CSM). An ASIG unit has only one single board, it is located at DT layer, and can share the position with DTI. Functions such as DTMF,MFC(CAS), Tones and conference call can be achieved by uploading different software. Analog signaling unit (ASIG)

1 ASIG 120 Circuit 1 ASIG 2 sub-unit DSP1# DSP2# ASIGASIG elevationSide elevation Notes ： ASIG mostly used as TONE and DTMF function Analog signaling unit (ASIG)

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

Fiber bus interface unit The advanced fiber optics technology is used in the ZXC10 MSC/VLR system for transferring large amount of information between inter-module at high bit rate. 3 pairs of FBI is used between the MPM and the SNM for 48×8Mb/s information transmission.

运行支撑子系 统 BCTL(SNM) BNET BCTL(MSM) CSM BCN FAN 7 CSM 6

CSM is composed of ： 1 ） Switching network unit ； 2 ） MSM ； 3 ） Control unit ； 4 ） Fiber bus interface unit ； 5 ） Synchronous clock unit

CSM

The 7th layer(MSM BCTL) MSM CTL Realize Message communication between CSM MP and the MPM MP.

CSM MSM hardware structure

CSM The 6th layer (SNM BCTL Layer): SNM BCTL Layer:Realize the voice and signalling switching of the inter-module.

CSM

SNM TNET: CPSN ： 64K*64K CDSN ： 32K*32K Switching capacity ： 16K X 16K TS HW rate ： 32Mb/s (128TS) Total M HW HW47 used for inter-module communication.HW63used for intra-module communication.all the others used for connecting with MPM.

The structure of MSC/VLR System Control unit Synchronous clock unit The structure of background The structure of Mobile Process Module(MPM) Switching network unit Digital trunk unit Analog signaling unit Fiber bus interface unit Agenda

MP NT Server TCP/IP protocol NT Client.. NT Client 。。。 router DDN PSTN/PSPDN MP The structure of background network

System divide into two parts:foreground and background MP (foreground) connect with background by TCP/IP protocol. Each node connected through HUB. Structure of network Network include three kinds of nodes: $MP of foreground $Server of background $Clients of background

1. Each MP and workstations background have IP addresses respectively. 2. Each node has a node number,distributed as ： 1~128 for active/standby MP 129~139 for NT Server 170~199 for NT client 254 for alarm box The structure of background network

The End