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Bottom of FormLibraryUploadDownloadof 37BsnlRatings: (0)|Views: 32|Likes: 0Published by prince395See more 1Practical Training Report AtBSNL, JODHPUR CONTENTS INTRODUCTION TO BSNL SDH SYNCHRONOUS DIGITL HERARCHY OCB ORGAN CONTOL BOARD MDF MAIN DISTRIBUTION FRAME PCM PULSE CODE MODULATION PROCESS ABBREVIATIONS

2BSNLBHARAT 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 1980s 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 31stmarch 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. DOT provides the following facilities : Telegraph services 3Telephone services such as Local calls, Trunk calls, Overseas calls etc. Wireless services including mobile wireless services for police, defense, metrological departments, etc Renting of Broadcast & TV channels Telecom Bureau Services Data Services FAX Services Telecom factories to manufacture telephone switching boards and accessories at Bhilai, Mumbai, Calcutta and Jabalpur. I.T.I. Bangalore for the manufacturing for the carriers, VFT, Coaxial and microwave equipment. I.T.I. Gonda for the manufacturing of E-10B electronic exchange equipment. Hindustan Cables LTD. Hyderabad & Rupnarainpur for manufacturing underground cables. Hindustan teleprinters LTD Chennai for manufacturing teleprinters. Local telecom network at the metropolitan cities of Mumbai and Delhi are under the MTNL(Mahanagar Telephone Nigam Limited). Its Corporate office is at Delhi. Hence Telecommunication sector has changed our life style today entirely and today it seems that world has become very small. SDH (SYNCHRONOUS DIGITAL HERARCHY) INTRODUCTION : It is an international standard networking principle and a multiplexing method. The name of hierarchy has been taken from the multiplexing method which is Activity (1)FiltersAdd to collectionReviewAdd NoteLike1 hundred readsMore From This UserInternet Markeing2prince395

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