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

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

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Computer Networking
Demodulation is a process of

converting analog to digital signals
performing data description.
multiplexing various signals into one high speed line signals
converting digital to analog signals

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