1 
NRZNonreturn to zero. Modulation scheme in which a phase deviation is held for a period of time in order to represent a data symbol. See Chapter 10.

2 
NRZNon Return to Zero: A binary encoding scheme in which ones and zeroes are represented by opposite and alternating high and low voltages, and where there is no return to a zero (reference) voltage between encoded bits. That is, the stream has only two values: low and high.

3 
NRZAbbreviation for nonreturntozero.

4 
NRZA binary encoding scheme in which ones and zeroes are represented by opposite and alternating high and low voltages and where there is no return to a zero (reference) voltage betwe [..]

5 
NRZnonreturn to zero. NRZ signals maintain constant voltage levels with no signal transitions (no return to a zerovoltage level) during a bit interval.

6 
NRZnonreturntozero. A code in which "1s" are represented by one significant condition and "0s" are represented by another, with no neutral or rest condition, such as a zero amplitude in amplitude modulation (AM), zero phase shift in phaseshift keying (PSK), or midfrequency in frequencyshift keying (FSK).

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