Computer Networking
A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. If Delta modulation is selected, then how many bits per second are actually sent?

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

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Computer Networking
A WATS arrangement

is never less expensive than flat-rate service
None of these
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short

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