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

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

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