Error control aspects of high speed networks

Error control problems arising in the broadband ISDN environment are analyzed. The first problem relates to end-to-end integrity. The second problem is related to synchronization. The third problem is the performance of the cell-based cyclic redundancy check (CRC) in the presence of a self-synchronous scrambler to avoid attacks by malicious users. However, the scrambler creates error multiplication whereby a single error on the physical link is translated into two errors in the cell exactly 43 bits apart. In this context, it is proved that the cell-based CRC is capable of correcting correlated double errors produced by the self-asynchronous scrambler. The last problem studied is parallel implementation of CRC coders and decoders