B8zs meaning

A technique used with alternate mark inversion (AMI) to support the transmission of long strings of zero bits, which are not unusual in data communications applications. When B8ZS encounters a string of eight zeros (00000000), it substitutes a specific bit pattern that intentionally violates AMI, i.e., includes an intentional bipolar violation (BPV). If the preceding mark (1 bit) was represented as a +3V (positive 3 volts), the substituted bit pattern is 0 0 0 +
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(Binary 8Zeros Substitution) An encoding method in T1 and E1 transmission that substitutes a special bit pattern for 8 consecutive zeros in order to maintain ones density. See ones density.
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