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In telecommunication, a longitudinal redundancy check , or horizontal redundancy check, is a form of redundancy check that is applied independently to each of a parallel group of bit streams. The data must be divided into transmission blocks, to which the additional check data is added.
The term usually applies to a single parity bit per bit stream, calculated independently of all the other bit streams , although it could also be used to refer to a larger Hamming code.
This "extra" LRC word at the end of a block of data is very similar to checksum and cyclic redundancy check.
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