DINESH PPT

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bsnl ppt from dinesh

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SUMMER TRAINING ON PRESENTED BY DINESH KUMAR MEENA E.C.E. 4 TH YEAR 9413738316

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Bharat Sanchar Nigam Limited(BSNL) is a Govt. of India Enterprises. BSNL provides telecom services all over the India. Technological developments in the field of telecommunication in India have been taking place at much faster as per the global trend. Particularly during last three years. There has been a major transformation in the switching technology. INTRODUCTION

Development of Electronic exchange:

At the beginning of electronic exchange vacuum tubes and gas tubes were used as switching devices. By the development of semiconductor devices , diodes,transistors,FET,CMOS are used as a switching devices. Development of Electronic exchange

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First Generation - In control circuits of switch room integrated circuits are used in ICs which are different type of logic gates,counter,flip-flop,timers, multiplexers etc. Second Generation - In this signals are stored in PROMs and signals for call processing and for supervision are obtained in the output of the memory. In such exchange gates multiplexers, flipflop,counters timers and RAM are used. Third Generation - In the third generation stored program control switching(SPC switching) is used. Different generation of Electronic exchange

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It is a large iron frame, divided into two parts. 1) Exchange side : exchange side is connect with the switch room. 2) Line side : line side is connect ed with the subscribers. m.d.f(main distribution frame)

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The MDF is connected with the switch room with the help of cables have different colour codes. The colour codes consist of: 1)Main colour: Blue, Orange, Green,Brown, Grey 2)Assistant colour: White, Red,Yellow,Black

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This is one of the important section of the exchange which control the whole exchange runs. The power can be provided using one of the following methods. Direct mains supply which is converted into dc with the help of rectifiers. Power generator Battery POWER SECTION

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These batteries are require less installation charge and space. The efficiency of these batteries is about 98%. Power cables are used for distribution of supply. These batteries once installed can be used for about 6 years. Value regulated acid battery( vrla )

Components of vrla:

Positive plate: lead cadmium Negative plate Electrolyte: Sulphuric acid in paste form Safety valve Terminal: copper terminal Components of vrla

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PCM Room consist of PCM transmitter and PCM receiver. Block diagram of transmitter Block diagram of receiver Pcm room Low pass filter sampler Quantizer Encoder Regenerative repeater Decoder Reconstruction filter Destination

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At present, Switching system is based on the principle of stored program control(SPC). Program related to call processing divided in different stages of system & are stored in its RAM/ROM. Processer used in control unit’s handle or process the call is to establish a connection b/w incoming and outgoing edges of a switch. Switch room

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OCB-283( organed control Board). This can do several functions related to communication. Ex. General telephony, data communication In 1993 there was entry of first of OCB-283 in exchange of india . Introduction to ocb

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WLL means to serve the subscribers' at home and offices without using wires. Wireless based local communication network. Provides voice and non voice services. Services in rural and urban areas. Wireless in local loop system

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BASIC SERVICES: voice,fax,low speed data SUPPLIMENTRY SERVICES: Call forwarding Call waiting and call barring Automatic call back Conference calling SERVICE QUALITY: Voice quality Network availability Services of wll

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The term broadband refers to a telecommunication signal of greater bandwidth. IT IS USED To provide high speed internet connectivity(up to 8 Mbps) To provide VPN services to the broadband customers To provide video and audio conferencing To provide both prepaid and postpaid broadband services Broadband services

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GPRS is a data service for GSM, European standard digital cellular service. It is a packet-switched mobile data service. It is a wireless packed based network. GPRS further enhancing GSM network to carry data, is also an important component in the GSM evolution entitled GSM+high-speed mobile data usage is enabled with GPRS Introduction to gprs

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GPRS is ideal for sending and receiving the data via the mobile station. This enables the user to send information via E-mail and also have access to mobile internet services. It is used for virtual market application It is used for E- commerce The services gprs provides

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