| 单词 | BPV (BiPolar Violation) |
| 释义 | BPV (BiPolar Violation) A violation of the line coding convention required by alternate mark inver- sion (AMI) in T-carrier networks or high density bipolar order 3 (HDB3) in E-carrier networks. AMI reverses the polarity of alternate marks, or 1 bits, expressing the first as a positive voltage of +3V, the second as a negative voltage of –3V, the third as +3V, and so on. Most deviations from this pattern indicate an error in transmission. If bipolar with eight-zeros substitution (B8ZS) is employed in conjunction with AMI, specific intentional bipolar violations can be used to indicate the legitimate transmission includes a long string (8 or more) of zero (0) bits. Since the violating bit patterns contain pulses, they prevent the receiver from losing track of the count of bit intervals that should represent 0s, which are sent in AMI as 0V on the line. B8ZS patterns must be known and configured into both the transmitting and receiving multiplexers so that the receiving multiplexer can restore the original 00000000 bit pattern. HDB3 is similar to AMI, but imposes a limit of three successive 0 bits. See also AMI, bipolar, HDB3, and voltage. |
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