| 单词 | B8ZS (Bipolar with Eight-Zeros Substitution) |
| 释义 | B8ZS (Bipolar with Eight-Zeros Substitution) 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 + – 0 – +. If the preceding mark was represented as a –3V (negative 3 volts), the substituted bit pattern is 0 0 0 – + 0 + –. Since the bit pattern is known to both the transmitting and receiving multiplexer, the receiving multiplexer can restore the original 00000000 bit pattern (see Figure B-1). AMI and B8ZS are used in T1 networks. A similar technique known as High Density Bipolar order 3 (HDB3) is used in E-1 networks. See also AMI, BPV, HDB3, and multiplexer. Eight Zeros 1 0 0 0 0 0 0 0 0 1 +3V 0 -3V Substitution with Bipolar Violation 1 0 0 0 + - 0 - + 1 +3V 0 -3V |
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