Longitudinal redundancy check

In telecommunication, a longitudinal redundancy check (LRC) is a system of error control based on the formation of a block check[?] following preset rules.

Note 1: The block check formation rules are applied in the same manner to each character.

Note 2: A combination of longitudinal and vertical redundancy check allows the detection and correction of single bit errors. Synonym horizontal redundancy check.

Source: from Federal Standard 1037C and from MIL-STD-188