Computer Networking
RS-449/442-A/423-A is

the ratio of the number of data units in error to the total number of data units
None of these
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
a check bit appended to an array of binary digits to make the sum of the all the binary digits
a set of physical layer standards developed by EIA and intended to replace RS-232-

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Computer Networking
Bulletin board system

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

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