Apparatus for generating and checking the error correction codes of messages in a message switching system.

摘要

An error correction apparatus for insuring the integrity of the messages exchanged between data processing unit in a multi-origin/multi-target units switching system wherein the messages are exchanged thru fixed size bursts or cells. Each unit comprises an error control circuit which computes for each burst of a message (for a destination unit) an error correction code as a function of an initial error correction code at the first burst of the message or of the error correction code of the previous burst and of the data bytes of the burst. The burst error correction code is sent on a medium which is separate from the data transport medium, as a companion of the burst. Also, the error control circuit receives the burst error correction code from an origin unit and generate the burst error correction code to be compared with the received burst error correction code. If a mismatch is detected the burst found in error is flagged. <IMAGE>