Computer Networking
A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

32 Kbps
64 Kbps
None of these
128 Kbps.
8 Kbps

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Computer Networking
Synchronous protocols

transmit characters one at a time
allow faster transmission than asynchronous protocols do
are generally used by personal computers
None of these
are more reliable

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