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INTRODUCTION TO B.S.N.L

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INTRODUCTION TO B.S.N.L

It is characterized as BHARAT SANCHAR NIGAM LIMITED.

B.S.N.L is the largest public sector undertaking of India in telecom.

Its 99.9% exchanges are digital.

Its yearly turnover is about rs. 22,000 crore.

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SERVICES OFFERED BY

B.S.N.LBasic telephone service. Internet

ISDN

Intelligent network

I-net

GSM cellular mobile

WIRLESS in local loop.

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EWSD SYSTEM DISCRIPTION

SYSTEM FEATURES:-

1.It can support maximum 2,50,000 subscriber or 60,000 incoming ,outgoing

or both way trunks.

2.It can carry 25,000 Erlanger traffic and can withstand 1.4 million

BHCA(busy hour call attempt).

3.It can work as isdn & intelligent network .

SYSTEM ARCHITECTURE:-

the main units of EWSD system are as under:-

1.Digital line unit(DLU)

2.Line/trunk group(LTG)

3.Switching network(SN)

4.Coordination processor

5.Common channel signaling network control(CCNC)

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Abbreviated dialing

Automatic wake up call

Call transfer

Call waiting

Hot line

Call conference

Detailed billing

Calling line identification

SPECIAL FACILITIES IN EWSD

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Switch room

Power plant and battery room

MDF room

Input and output processor room

Operation and maintenance room

A.c room

Engine alternator room

POSTVALETS OF

TELEPHONE EXCHANGE

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Principal of carrier telephony

Coaxial and microwave system

Transmission units

INTRODUCTION TO

TRANSMISSION SYSTEM

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MULTIPLEXING TECHNIQUES:-

1 Frequency division multiplexing

2 Time division multiplexing

PULSECODE MODULATION:-

basic requirements of PCM system:-

1. Filtering

2. Sampling

3. Quantization

4. encoding

5. Line-coding

THEORY OF PULSE CODE

MODULATION

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BIBLIOGRAPHY Manual

provided by B.S.N.L,Udaipur(Raj)

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