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Common channel signalling
Signalling systems link the variety of switching systems, transmission systems and subscriber equipments in telecommunication network to enable the network to function as a whole. 3 forms of signalling are involved in a telecommunication network:
1. Subscriber loops signalling.
2. Intra exchange or register signalling
3. Interexchange or inter register signalling
If a current of 20A flows for five minutes, find the quantity of electricity transferred. Quantity of electricity, Q = It = 20 x 5 x 60 = 6000C
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