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Binary 8 Zero Suppress (B8ZS)

Binary 8 Zero Suppress (B8ZS) is an improved line encoding scheme used in North American telecommunications systems and is an improvement on Alternate Mark Inversion (AMI) encoding, freeing another 11kbps of bandwidth over a DS0 compared to AMI.

T1 circuits are plesiosynchronous, meaning "almost synchronous". T1's use a clocking signal which is modulated (altered from a known pattern) to encode data into the signal. The far end receiver of a T1 derives the clocking from the signal itself, so clocking information has to be encoded into the signal using a pattern of "marks" from the transmitting side.

          |======+=============================================|
          | DATA | 0 1 0 1 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 1 |
          |------+---------------------------------------------|
          | B8ZS | 0 + 0 - + 0 0 0 + - 0 - + - 0 0 + 0 0 0 0 - |
          |======+=============================================|
             '+' = Positive Voltage Pulse
             '-' = Negative Voltage Pulse
             '0' = No Voltage Pulse

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