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BSNL
INTRODUCTION“BHARAT SANCHAR NIGAM LIMITED” is abbreviated as BSNL. It is fourth largest departement of TeleCommunication Company in Asia and seventh in world today. Which is one of the most earning revenue in India. Above more than 3 laces employees, officer and engineers working in BSNL at present. Previously electro mechanically exchanges for use in India namely Strowger type exchange, cross bar exchange were there. These manual telephone exchanges suffered from some disadvantages. To overcome these an automatic exchange was introduced in this system. In 1980’s PITHROTHA LTD. Introduced “ C-DOT ” exchange in India. These exchanges replaced by electro mechanical exchange. These exchange which has wide range of capacity replaced electro mechanical exchange, C-DOT-128, C-DOT-256, C-DOT-512, C-DOT- 1024(SBM) exchange, C-DOT-2048(MBM) exchange and so on. Besides C-DOT exchange ILT exchange, E-10B exchange also proved of mild stone in Telecommunication Sector to replace electromechanical exchanges, which were most sophisticated and modern latest techniques electronics exchanges. There after it was OCB-283 exchange which proved very important exchange in this series to replace electro mechanical exchanges. Now it is “WLL” & “GSM” mobiles which is also proved a mild stone in Telecommunication sector. It was 31st march 2002 when BSNL started these GSM mobile and today it has provided almost 35 lacks mobiles in all over country. WLL system which is also a mobile with limited mobility in city & can have Tele communication facility in that area almost. While GSM can cover all cities of the country.
