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8/8/2019 Arun and Apurv
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Arun Sharma
Apurv Agarwal
ECE , VII SEM
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INTRODUCTIONINTRODUCTION
y It is oldest & largest land line provider in India and4th largest cellular service provider.
y It has status ofMINI RATNA.
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PRODUCTS AND SERVICES (Cont.)
Cellular ServiceBasic Telephone Services
Internet
ISDN
IntelligentNetworkWireless In Local Loop
3rd Generation (3G)
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DIVISION OF BSNL EXCHANGEDIVISION OF BSNL EXCHANGEy M.D.F.(MAINDISTRIBUTION FRAME)
y SWITCHING ROOM
y TRANSMISSION ROOMy OFC
y EXPLOITATION ROOM
y POWERSECTION
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MDF (Main Distribution Frame)MDF (Main Distribution Frame) It acts as a termination for subscriber and exchange pairs.
InMDF these pairs are connected by Jumpers.
Afault of telephone number is removed inMDF.
Fault is corrected by a live tester.
MDF basically has two sides: Line & Exchange.
Line side:
1 vertical has 10 tag blocks. Each tag has 10 rows and each row has 10 lines i.e. each tag has 100
lines.
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Exchange side:
Each tag block has 128 tags.
Each block is divided in 4 segments. i.e. 0, 1, 2 & 3.
Types of Faults:
Loop fault
Earth fault
Cable fault
Disconnect fault Protective devices used in MDF:
Fuses
G.D. Tube.
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TELEPHONE NO. CODING
0034/011 ~25675038
011
STD
0034
ISD
256
AREA CODE
75
EXCHANGECODE
038
SUSCRIBERNO
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OPTICAL FIBRE
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Condition For Optical Fiber
Communication:-
Angle of incidence should begreaterthancriticalangle, in
orderto propagatethelightthrough the medium.
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TELEPHONE WORKING
PSTN
T L PH N HAVING TW WI S. N F TH WI HAVING 0VOLT AND OTH WI
HAVING -15V D .
alling subscriber
Called subscriber
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ACTUAL
TELEPHONIC COMMUNICATION
CALLING NUMB
LOCAL XCHANG
OF CALLING NO.TAX XCHANG
OF CALLING NO.S CITY
VSNL S VICEPROVIDEROF THAT CITY
LOCAL OFC
LOCAL EXCHANGEOF CALLED NO.
TAXEXCHANGESERVICEPROVIDER
OF CALLED NO.S CITY
CALLED NUMBER
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Exploitation Room
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Exploitation Room (Cont.)Also known as Operational and Maintenance
Room (OMR).
All the operations are done through systemsoftware by operating different commands over
there.
Computers present in the room are havingSoftware's likeDOT-SOFT etc.
These Computers have all the records, facilities ofsubscriber.
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CONNECTIONSOF LOCAL
EXCHANGESy All the subscribers of same local area are
connected to single exchange called localexchange.
Local
Exchange LocalExchange
LocalExchange
local loop
Long distance
network
trunkcircuitsubscriber
line
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