Return To Zero Coding Transmission
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Data transmission may also be “coded” in different formats. In an optical network a pulse of light will represented by a 1 (one) bit and no light will present a digital zero bit. The NRZ [Non-Return to Zero] or always ON format will transmit a sequence of 1s (ones) by continuing to transmit a light pulse and will only stop in order to send a 0 (zero) bit. NRZI [Inverted] is encoded - 1 bit is encoded as a transition while a 0 bit doesn’t change signal levels.
The RZ [Return-to-Zero] or always zero format is the oppose transmitting no light or digital 0 (zero) bit even between successive 1 (one) bits. RZ is less affected by dispersion as would be used in a long line undersea network.
[tags]RZ, NRZ, NRZI, digital zero, coding transmission[/tags]