longitudinal parity

<storage, communications>

An extra byte (or word) appended to a block of data in order to reveal corruption of the data. Bit n of this byte indicates whether there was an even or odd number of "1" bits in bit position n of the bytes in the block. The parity byte is computed by XORing the data bytes in the block. Longitudinal parity allows single bit errors to be detected.

Last updated: 1996-03-01

Nearby terms:

LolliLOMlongitudinal parityLongitudinal Redundancy CheckLOOK

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Longitudinal Redundancy Check

<storage, communications>

(LRC, Block Redundancy Check) An error checking method that generates a longitudinal parity byte from a specified string or block of bytes on a longitudinal track.

The longitudinal parity byte is created by placing individual bytes of a string in a two-dimensional array and performing a Vertical Redundancy Check vertically and horizontally on the array, creating an extra byte. This is an improvement over the VRC because it will catch two errors in the individual characters of the string, beyond the odd errors.

Last updated: 2004-01-26

Nearby terms:

longitudinal parityLongitudinal Redundancy CheckLOOKLook Ahead Left-to-right parse, Rightmost-derivation

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