In this paper, we study bit interleaved parity (BIP) code performance based on the features of BIP code. We find the closed form by applying the binomial theorem to solve the undetected error probability when even parity is used for detecting transmission errors in SDH networks. We estimate BIP code performance and calculate the theoretical and detected values of block error rate according to the formulae recommended by ITU-T and amended by us. From a group of curves related to them, we study the numerical results. Our method provides a new choice for performance analysis of error blocks in SDH network, that is simpler than previous methods.
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