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

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
the ratio of the number of data units in error to the total number of data units
a set of physical layer standards developed by EIA and intended to replace RS-232-
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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Computer Networking
A WATS arrangement

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

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