Non-return-to-zero
In
telecommunication
, a
non-return-to-zero (NRZ)
line code
is a
binary
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). NRZ is used in the
RS-232
serial protocol. For a given
data signaling rate
,
i.e.,
bit rate
, the NRZ code requires only half the
bandwidth
required by the
Manchester code
.
Contrast with:
return-to-zero
. Source: from
Federal Standard 1037C
in support of
MIL-STD-188
.
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