Computer Networking
Which of the following refers to the terms "residual error rate"?

The probability that one or more errors will be undetected when an error detection scheme is used
the probability that one or more errors will be detected when an error detection mechanism is used
signal to noise ratio divided by the ratio of energy per bit to noise per hertz
None of these
the number of bit errors per twenty four hours of continuous operation on an asynchronous line

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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
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
specifies only the mechanical characteristics of an interface by providing a 25-pin connector

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