Presented ByKeshav katiyar

E.C. 4th yr.

1147431049

Topic

“Study Of Infrastructure

and Working in

Telecommunication

Industry”

SHRI SIDDHI VINAYK

INSTITUTE OF TECHNOLOGY

BAREILLY

Bharat Sanchar Nigam Limited (abbreviated BSNL) is an

Indian state-owned telecommunications company .

headquartered in New Delhi.

It has 24 telecom circles, 2 metro districts, 6 project circles, 4

maintenance regions, 5 telecom factories, 3 training

institutions and 4 specialized telecom units.

SERVICES PROVIDED BY BSNL

C-DOT DSS MAX-XL

Cellular Mobile Telephone Services

3G

Internet

WiMax

WLL-CDMA Telephone Services

Universal Telecom Services

Intelligent Network (IN)

VVoIP

All telephone subscribers areserved by automatic exchanges.

Today’s automatic exchanges usesa pair of computers.

One, running the program thatprovides services.

Second, monitoring the operation of the first, ready to take over in a few seconds in the event of equipment failure.

Various exchanges present in BSNL are:

C-DOT OCB EWSD

ABOUT THE EXCHANGE

MDF

Power plant

Switching Room

MAIN DISTRIBUTION FRAME(MDf)

Local cable contact at MDF .

All types of cables out to the door contact connection at MDF .

The primary function of MDF is to remove fault. It is also known as Fault Remove Section.

As we know that, the power is the main source or any organization.

The main source of this exchange is AC supply.

The main part of power room are:-

1. Batteries

2. UPS (Uninterrupted Power Supply)

3. Charging - Discharging Unit

4. Inverter and Converter Unit

C-DOT DSS MAX is a universal digital

switch which can be configured for

different applications as local, transit,

or integrated local and transit switch.

High traffic/load handling capacity

upto 8,00,000 BHCA with termination

capacity of 40,000 Lines as Local

Exchange or 15,000 trunks as Trunk

Automatic Exchange.

C-DOT DSS MAX-XL

Base Module

Central Module

Administrative Module

Input Output

Module

BASIC BUILDING MODULES

BASE MODULE(BM)

BM-XL is the basic growth unit of C-DOT DSS. It

Interface the external world to the switch.

C-DOT MAX-L & C-DOT MAX-XL can contain

maximum 16 & 32 BM respectively.

BM consists of 4 TU(Terminal Unit), 1 BPU(Base

Processor Unit) and 1 TSU(Time Switch Unit).

BM also Define the TEN number of subscriber. For

example subscriber have directory no. 222999

shows the TEN no. as 1-1-1-5-4. then the first digit

shows BM no. 2nd shows line module no. 3rd shows

frame no. 4th shows card no. & 5th shows slot no.

The basic functions of a Base Module are –

Analog to digital conversion of all signals on

analog lines and trunks

Interface to digital trunks

Switching the calls between terminals

connected to the same Base Module

Communication with the Administrative

Module via the Central Module for

administrative and maintenance functions

Provision of special circuits for call

processing support e.g. tones,

announcements, MF/DTMF

senders/receivers

GLOBAL SYSTEM FOR

MOBILE COMMUNICATION

(GSM)Global system for mobile communication (GSM) is a

globally accepted standard for digital cellular

communication.

GSM is the name of a standardization group established in

1982 to create a common European mobile telephone

standard GSM is a cellular network which means that mobile phones

connect to it by searching for cells in the immediate vicinity.

GSM operates in the 900 MHz frequency band.

Mobile Station (MS)

Base Station (BS)

Mobile services Switching Center (MSC)

Databases

Operation and Maintenance Center

(OMC)

Worldwide Interoperability for Microwave

Access.

Is a certification mark for products that pass

conformity and interoperability tests for the

IEEE 802.16

provides wireless data over long distances

in a variety of ways, from point-to-point links

to full mobile cellular type access .

Speed

– Faster than broadband service.

Wireless

– Not having to lay cables reduces cost .

– Easier to extend to suburban and rural

areas.

Broad coverage

– Much wider coverage than WiFi

hotspots.