Computer Networking
Demodulation is a process of

converting digital to analog signals
converting analog to digital signals
performing data description.
multiplexing various signals into one high speed line signals

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Computer Networking
A WATS arrangement

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received
None of these

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