OCB/TAX TELECOM EQUIPMENT
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03-01-2011, 01:21 PM
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SHREE GANPATI INSTITUTE OF TECNOLOGY
Bharat Sanchar Nigam Ltd. formed in October, 2000, is World's 7th largest Telecommunications Company providing comprehensive range of telecom services in India: Wire line, CDMA mobile, GSM Mobile, Internet, Broadband, Carrier service,MPLS-VPN, VSAT services, IN Services etc. Within a span of five years it has become one of the largest public sector unit in India.
BSNL has installed Quality Telecom Network in the country and now focusing on improving it, expanding the network, introducing new telecom services with ICT applications in villages and wining customer's confidence. Today, it has about 47.3 million line basic telephone capacity, 4 million WLL capacity, 20.1 Million GSM Capacity, more than 37382 fixed exchanges, 18000 BTS, 287 Satellite Stations, 480196 R km of OFC Cable, 63730 Rkm of Microwave Network connecting 602 Districts, 7330
cities/towns and 5.5 Lakes villages. Scaling new heights of success,
The present turnover of BSNL is more than Rs.351,820 million (US $ 8 billion) with net profit to the tune of Rs.99,390 million (US $ 2.26 billion) for last financial year. The infrastructure asset on telephone alone is worth about Rs.630,000 million (US $ 14.37 billion).
The foundation of telecom network in India was laid by British sometime in 19th century & history of B.S.N.L. is linked with beginning of telecom in India was operated as a
government of India wing.
Earlier it was the part of post & telegraph department (P&T). in 1975 the department of telecom (D.O.T.) was separated from P&T. subsequently in
1990 the telecom sector was opened up by government for private investment therefore it became necessary to separates the government’s policy wing from operations wings. The government of India corporatized the operations wing of D.O.T. on October 01, 2000 and named it as Bharat Sanchar Nigam Limited (B.S.N.L.)
B.S.N.L. Present & Future:-
Since corporation in October 2000, B.S.N.L. has been actively providing connections in both urban and rural areas and the efficiency of the company has drastically improved from the days when one had to wait for years to get a phone connection to now when one can get a connection in even hours.
BSNL plans to expand its customer base from present 47 million lines to 125 million lines by December 2007 and infrastructure investment plan to the tune of Rs. 733 crores (US$ 16.67 million) in the next three years. The turnover, nationwide coverage, reaches,
BSNL the No. 1 Telecom Company of India. Comprehensive
Main Distribution Frame
M.D.F. is a media between switching network and subscriber’s line. It distributes wires in different areas and this wire connects switching room and subscriber’s line.
M.D.F. has different parts as:-
1. V.F. (Vertical frame)
2. N.E. (number of equipments)
5. Wire and Cable.
OCB-283- System Description
All new technology switching system are based on stored programmed control concept. The all-processing programs are distributed over different control organs of the system and are stored in ROM/RAM of the units. Data required to handle the calls are also managed in the RAMs of different control units. Processor in the control units by using the programmed and data stored in unit ROM/RAM process and handle calls. Handling or processing a call ultimately establishes a connection in a switch between I/C and O/G ends. Depending on the system the name and architecture of control unit’s switch may change but basic criterion for switching remains or less the same.
OVERVIEW OF OCB 283 DIGITAL ELECTRONIC SYSTEMS: -
OCB 283 is digital switching system which supports a variety of communication needs like basic telephony, ISDN, interface to mobile communication, data communication etc. This system has been developed by CITALCATEL of France and therefore has many similarities to its predecessor E-10B (also known as OCB 181 in France).
The first OCB 283 exchanges of R11 version were commissioned in Brest and Beijing(China) in 1991. The first OCB-283 exchange came to India in 1993. Subsequently, the system has been upgraded and current version R-20 was fully validated in January 1994. The exchanges, which are being supplied. The basic architecture remaining same, facilities both to subscribers and administration are supported by later versions.
Salient Features of the system: -
i. It supports both analogue and digital subscribers
ii. It provides telephony, I.S.D.N., Data communication, cellular radio
and other valuable services.
iii. The system has Automatic Recovery feature. When a serious fault occurs in control unit, it gives message to SMM(O&M unit). The SMM unit puts this unit out of service, loads the software of this unit in a back up unit and brings it into the service. Diagnostic programmed are run on the faulty unit and printed on the terminal.
iv. Every system in OCB-283 works in duplex. One system remains in working condition and other remains in standby mode.
v. The charge accounts of the subscriber are automatically save on the disk once in a day. This avoids the loss of revenue in case of total power supply failure.
vi. This system requires very less space . there is no fix rack and suite configuration in the system. It provides great flexibility.