longitudinal redundancy check

In telecommunication, a longitudinal redundancy check (LRC) or horizontal redundancy check is a form of redundancy check based on the formation of a block check following preset rules.

The block check formation rules are applied in the same manner to each character.
A combination of longitudinal and vertical redundancy check allows the detection and correction of single bit errors.

Source: from Federal Standard 1037C and from MIL-STD-188 A longitudinal redundancy check character, which is used to verify that data has been received without error, may be computed from any sequence of characters by the following algorithm:

                  Set LRC = 0         While there is another character in the string         do             Set c equal to the next character             Set LRC equal to LRC XOR c         end do

LRC XOR c specifies that corresponding bits of LRC and c should be exclusive-ored and the resultant bit values should become the values of the corresponding bit of the result.

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