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Q. Name all the switching schemes used in a digital exchange. How call processing occur?
Ans:
The basic types of switching systems used are:
1. Stronger Switching System
2. Cross bar Switching.
3. Electronic Switching System.a
Basic Call Procedure: Figure demonstrates a simplification diagram explaining how two telephone sets (subscribers) are interconnected by a central office dial switch. Every subscriber is connected to switch through a local loop. Switch is most likely some sort of an electronic switching system (ESS machine). Local loop are terminated at the calling and called stations in telephone sets and at central office ends to switching machines.
When calling party's telephone set goes off hook (which means lifting the handset off the cradle), switch hook in the telephone set is released, completing a dc path between tip and ring of the loop through the microphone . ESS machine senses a dc current in loop and identifies this as an off-hook condition.
Q. What is the need of MODEM in data communication? Need of Modem: Modems are used to interface computers, computer networks in addition to other terminal equipment to teleco
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