Computer Networking
Bulletin board system

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

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Computer Networking
RS-232-G

requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
is an interface between two data circuit terminating equipment as examplified by a local and remote modem
None of these
specifies only the mechanical characteristics of an interface by providing a 25-pin connector
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment

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