Non-return-to-zero
In
telecommunication, a
non-return-to-zero (NRZ) is 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
phase-shift keying (PSK), or mid-
frequency in
frequency-shift keying (FSK).
For a given data signaling rate, i.e., bit rate, the NRZ code requires only one-half the bandwidth required by the Manchester code.
Contrast with Manchester code, return-to-zero.
Source: from Federal Standard 1037C in support of MIL-STD-188