Computer Networking
The synchronous modems are more costly than the asynchronous modems because

they produce large volume of data
None of these
they operate with a larger bandwidth
they contain clock recovery circuits
they transmit the data with stop and start bits.

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Computer Networking
A WATS arrangement

is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is always 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 never less expensive than flat-rate service

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