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
a check bit appended to an array of binary digits to make the sum of the all the binary digits
None of these
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-

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Computer Networking
RS-232-G

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

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