bsnl seminar on industrial training

7/30/2019 Bsnl seminar on industrial training

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AT BHARAT SANCHAR NIGAM LIMITED


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Provides affable environment.

To familiarize with various communicating technology.

Time Management with various Modules.

Team Management with members.

Building up practical skills.

Imparting leadership quality.


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4th largest telecommunication company inasia and 7th largest in the world.

Provides GSM and basic telephony service andfirst company in India providing 3G.

More than 3 laces of employees, officers andengineers are working at present.


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-> WLL (wireless in locked loop)

-> GSM (global system for mobile communication)

-> CDMA (code division multiple access)

-> MTNL ( mahanagar telephone nigam limited)


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What is WLL?

-Communication system that connects us to PSTN.

- Use Radio Frequency Signals.

- Useful for Subscribers located in pockets.


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Provides 2 types of services

(1)Fixed WLL

(2) WLL with portability

Features of WLL

i) Dynamic STD/ISD locking.

ii) Call Waiting / Call transfer.

iii) Call Forwarding.

iv) STD / ISD call details.


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- Provided using a telephone instrument.

- FWT will be wall mounted.

-Short cable connected from outdoor

aerial to wall set.

- Wall set powered by an a.c. supply.


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-Provides portability feature to WLL subscriber.

- This can be done by a portable hand Set whichcan be carried in the pocket.


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History- Torleiv Maseng is regarded as the father of the GSM

Technology.

- 1989, GSM responsibility was transferred to the

European Telecommunications Standards Institute (ETSI)- first GSM network was launched in 1991 by Radiolinja in

Finland with joint technical infrastructure maintenance

from Ericsson.
http://en.wikipedia.org/wiki/European_Telecommunications_Standards_Institutehttp://en.wikipedia.org/wiki/Radiolinjahttp://en.wikipedia.org/wiki/Finlandhttp://en.wikipedia.org/wiki/Ericssonhttp://en.wikipedia.org/wiki/Ericssonhttp://en.wikipedia.org/wiki/Finlandhttp://en.wikipedia.org/wiki/Radiolinjahttp://en.wikipedia.org/wiki/European_Telecommunications_Standards_Institute


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2G GSM networks operate in the 900 MHz or

1800 MHz bands

GSM-900 uses 890

915 MHz to send informationfrom the mobile station to thebase station (uplink)

935960 MHz for the other direction (downlink),

providing 125 RF channels (channel numbers 0to 124) spaced at 200 kHz. Duplex spacing of 45

MHz is used
http://en.wikipedia.org/wiki/2Ghttp://en.wikipedia.org/wiki/Mobile_stationhttp://en.wikipedia.org/wiki/Base_Station_Subsystemhttp://en.wikipedia.org/wiki/Base_Station_Subsystemhttp://en.wikipedia.org/wiki/Mobile_stationhttp://en.wikipedia.org/wiki/2Ghttp://en.wikipedia.org/wiki/2G


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MS refers to the physical

phone itself.

uniquely identified by the

International Mobile

Equipment Identity (IMEI)

number.

Sim is small smart card that

is inserted into the phone andcarries information specific to

the subscriber


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carry out radio communications

between the network and the MS

handles speech encoding,encryption, multiplexing (TDMA),

and modulation/demodulation

between 1 and 16 Transceivers(TRX)


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allocation of radio channels

frequency administration

power and signal measurements

from the MS,

handovers from one BTS toanother


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call routing, call setup, and basic

switching functions

iner-BSC handoffs as well as

coordinates with other MSC's for

inter-MSC handoffs.


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gateway between two

networks

switch to the Public Switched

Telephone Network (PSTN).


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HLR maintains subscriber-

specific information such as the

MSISDN, IMSI, current

locationof the MS, roaming

restrictions,

VLR is a database thatcontains

a subset of the information

located on the HLR


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EIR is a database that keeps

tracks of handsets on the network

using the IMEI

handles the authentication and

encryption tasks for the network


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All PSTN applications Integrated access node

CSNMM - ADSL + Voice

Backward compatible with

CSNMA

CSE Support for V5.2 for access nodes

Trunk Automatic Exchange (TAX)

International Gateway

Signaling transfer point (STP)

IN SSP

Mobile applications GSM /GPR


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bsnl seminar on industrial training

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