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

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

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Computer Networking
Bulletin board system

is a public access message system
converts digital signals to analog signals
None of these
converts analog signals to digital signals
is a modem capable of accepting commands

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