Familiarization of CDOT Switching Systems

HARDWARE ARCHITECTURE OF HARDWARE ARCHITECTURE OF CDOT MAX-CDOT MAX-XLXL SWITCHING SYSTEM AND ANALYSIS OF SWITCHING SYSTEM AND ANALYSIS OF DIAGNOSIS REPORTSDIAGNOSIS REPORTS

Syndicate names:

K.Sandeep kumar(06261A0424)L.Vickram kumar(06261A0425)S.Prabhu (06261A0446)

Internal guide: Mrs .J.Snehalatha (assnt.professor)External guide: Mr. V.V.V.Satyanarayana (SDE)

project guides:

Bharat Sanchar Nigham Ltd.Regional Telecom Training CentreGachibowliHyd.

Project pursuing:

SYSTEM ARCHITECTURE

BASE MODULEThe Base Module (BM) is the basic growth unit of the system. It interfaces subscriber lines, analog and digital trunks, CCM and PBX lines. Each Base Module can interface upto 2024 terminations. The number of Base Modules directly corresponds to the exchange size. It carries out majority of call processing functions and, in a small-exchange application, it also carries out operation and maintenance functions with the help of the Input Output Module.

ATU(TIC2) ATU(TIC1)ATU(TIC3)

ATU(TIC4)

ATU(TIC10)ATU(TIC11)

ATU(TIC12)

ATU(TIC5)

ATU(TIC9)ATU(TIC13)

ATU(TIC6)

ATU(TIC7)

ATU(TIC8)

ATU(TIC14)

ATU(TIC15)

ATU(TIC16)

BPU

TSU

Fig : SINGLE BASE MODULE

BMLM-1 LM-2

C-DOT SBM

ATU(TIC1)

ATU(TIC5)

ATU(TIC9)

ATU(TIC13)

BPU

TSU

LINE

INTERFACE

FRAMES

(LIF)

CONTROL

FRAMES

Fig : BASE MODULE

Analog to Digital conversion of all signals on analog subscriber, trunks lines and interfacing digital trunks. Switching calls between terminals connected to the same BM Communication with the AM via CM for administrative functions and also for call processing functions. Provision of special circuits for calls processing support e.g. digital tones, announcements, terminal tester, and MF/DTMF controller etc Provision for local switching & metering in case of RSU application in standalone mode.

Basic function of BM are-

CENTRAL MODULECentral Module (CM) consists of a message switch and a space switch to provide inter-module communication and perform voice and data switching between Base Modules.

It also provides clock and synchronization on a centralized basis.

CM provides connectivity to 16 BM’s if it is CM-L and 32 BM’s if it is CM-XL.

BTU 0 SSU 0

SSU 1

BTU 1

SSCU

APU

Fig : CENTRAL MODULE

Bus Terminal Unit For Bus 0

Space Switching Unit For Bus 1

Administrative Processor Unit

Space Switch Control Unit

Space Switching Unit For Bus 0

Bus Terminal Unit For Bus 1

The basic function of CM are-

Bus Termination. Space Switching. Space switching control. Administration.

ADMINISTRATIVE MODULEAdministrative Module (AM) performs system-level

resource allocation and processing function on a centralized basis.

AM performs all the memory and time intensive call processing support functions and also administration and maintenance ADMINISTRATIVE MODULE functions.

AM communicates with the Base Module via the Central Module. It supports the Input Output Module for providing man- machine interface. It also supports the Alarm Display Panel for the audio-visual indication of faults in the system.

AM performs system level resources allocation and processing function on a centralized basis.

It communicates with Base Processors via the Central Message Switch. It performs all the memory and time intensive call processing support functions.

The basic functions of AM

INPUT OUTPUT MODULE (I0M)*Input, Output Module (IOM) consists of duplicated Input Output Processor (IOP). *It is used as the front-end processor in C-DOT DSS. It handles all the input and output functions in C-DOT DSS.*The IOP is connected to AP/BP via HDLC links. *During normal operation, two IOP’s interconnected by a HDLC link, operate in a duplex configuration. *Working as front-end processor, it provides initial code down load to the subsystems, man machine interface and data storage for billing and other administrative information.*It supports printers and upto 8 serial ports for video display units which are used for man- machine communication interface.

IOP

The basic function of IOM are-

Interfaces peripheral devices like disk drives, cartridge tape drive and floppy drive.

It support printer and up to 24 serial ports for video display units that are used for man – machine communication interface.

CONCLUSIONC-DOT DSS is a universal digital switch which can be configured for different applications.

Another important feature is the provision of both centralized operation and maintenance.

All services are provided through a simple, interactive and man-machine interface.

The equipment practices provide modular packaging. Hence it is easy to maintain exchange with software rather than man interference.

Testing of various features have become easy and also modifying parameters presented in it.

Hence C-DOT switch can be maintained easily through software.

THANK YOU