Return-to-zero (RZ) describes a line code used in telecommunicationssignals in which the signal drops (returns) to zero between each pulse. This takes place even if a number of consecutive zeros or ones occur in the signal. The signal is self-clocking. This means that a separate clock does not need to be sent alongside the signal, but suffers from using twice the bandwidth to achieve the same data-rate as compared to non-return-to-zero format.
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A digitalcode having two information states, e.g. , "0" and "1" or "mark" and "space", in which code the signal returns to a rest state during a portion of the bit period. (188 )
<communications> A class of encoding methods for physical circuits in which the carrier (current, voltage) returns to zero after each transmitted bit, i.e. the data is carried in pulse width or polarity, not in the level of the signal. Contrast NRZ. (1995-11-11)
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