BIP - 8执行以前的同步传输信号电平1 (STS - 1)帧的偶数奇偶校验。
BIP-8 performs an even-parity check on the previous Synchronous Transport Signal level 1 (STS-1) frame.
偶数的错误，可以躲避的高错误率的链路上的奇偶校验。
Even-numbered errors can elude the parity check on links with high error rates.
有偶数不到B2奇偶校验计算的错误的机会大大减少。
There is considerably less chance of an even-numbered error that eludes the B2 parity calculation.
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