NRZ

NRZ (non-return-to-zero) refers to a form of digital data transmission in which the binary low and high states, represented bynumerals 0 and 1, are transmitted by specific and constant DC (direct-current) voltage s.

In positive-logic NRZ, the low state is represented by the more negativeor less positive voltage , and the high state is represented by the less negative or morepositive voltage. Examples are:

Logic 0 = +0.5 volts
Logic 1 = +5.0 volts

Logic 0 = -3.0 volts
Logic 1 = 0.0 volts

In negative-logic NRZ, the low state is represented by the more positiveor less negative voltage, and the high state is represented by the less positive or morenegative voltage. Examples are:

Logic 0 = +5.0 volts
Logic 1 = +0.5 volts

Logic 0 = 0.0 volts
Logic 1 = -3.0 volts

Some people wonder why the name of this mode is preceded by"non" when one of the logic states might be represented by zero voltage.The answer becomes apparent from the comparative definition of RZ (return-to-zero).

See also bipolar signaling , unipolar signaling , and RZ .

Last updated on: Sep 21, 2005

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