22-03-2014, 02:36 PM
BHARAT SANCHAR NIGAM LIMITED
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INTRODUCTION
“BHARAT SANCHAR NIGAM LIMITED” is abbreviated as BSNL. It is fourth largest department of Telecommunication Company in Asia and seventh in World today, which is one of the most earning revenue in India. Above more than 3 lack employees, officer and engineers working in BSNL at present.
Bharat Sanchar Nigam Ltd. was incorporated on 15th september 2000 . It took over the business of providing of telecom services and network management from the erstwhile Central Government Departments of Telecom Services (DTS) and Telecom Operations (DTO), with effect from 1st October‘ 2000 on going concern basis.It is one of the largest & leading public sector units providing comprehensive range of telecom services in India.
BSNL has installed Quality Telecom Network in the country & now focusing on improving it, expanding the network, introducing new telecom services with ICT applications in villages & winning customer's confidence. Today, it has about 43.74 million line basic telephone capacity, 8.83 million WLL capacity, 72.60 million GSM capacity, 37,885 fixed exchanges, 68,162 GSM BTSs, 12,071 CDMA Towers, 197 Satellite Stations, 6,86,644 RKm. of OFC, 50,430 RKm. of microwave network connecting 623 districts, 7330 cities/towns & 5.8 lakhs villages .
MAIN DISTRIBUTION FRAME
INTRODUCTION
The switching equipment, common to all the subscribers of the area is located in an exchange. To make possible for a subscriber to communicate with remaining subscribers, telephone of each and every subscriber must be connected to the exchange. The function of MDF is to provide a means for connecting side is terminated at OCB where the switching takes place. From OCB, through PCM connected to various sections like WLL, TAX etc. A line from the subscriber’s telephone set involves:
• Subscribers House wiring
• Overhead wires
• Cable Distribution Point
• Underground cables
• Exchange Main Distribution Frame
From the subscriber’s house wiring, the line is brought on overhead wires to a point called distribution point (DP). From the DP, the pairs are extended to the pillar & again these are extended to the exchange through underground distribution cables, secondary cables and primary cables. At the exchange are brought through underground cables to cable chamber. In the cable chambers, they are jointed to PVC cables for terminating at MDF. This frame incorporates protecting devices and provides for a flexible arrangement for connecting subscriber’s lines to exchange equipments.