Collision detection using code rule violations of the...

H - Electricity – 04 – L

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H04L 12/26 (2006.01) H03M 5/12 (2006.01) H04B 17/00 (2006.01) H04L 12/413 (2006.01) H04L 25/49 (2006.01) H04L 29/02 (2006.01)

Patent

CA 2067354

A collision detection method and apparatus (10) is disclosed for detecting code rule violations in Manchester encoded data packets. The signals .delta.0 - S2n - S2n-1, $(25,n, .delta.2 = S2n+1 - S2n-1, .sigma.0 = S2n + S2n-1 are determined at time nT where S2n-1 and S2n are the Manchester code bit pair representative of the nth bit in a data stream having a bit period T. Processing of these signals permits the detection of most collisions since the Manchester coding rules are violated more than half the time in the signal formed by the colliding packets. To ensure 100 collision detection, a preamble using an intentional violation of the Manchester code in the pattern 10 11 01 10 is advantageously used in each data packet and a collision is signalled upon detection of two or more coding violations.

On a mis au point un procédé et un appareil de détection de collisions, destiné à détecter les infractions aux règles du code dans des paquets de données codées selon le code Manchester. Les signaux delta0 = S2n - S2n-1, delta1 = S2n+1 - S2n, delta2 = S2n+1 - S2n -1, sigma0 = S2n + S2n -1, sont déterminés au temps nT où S2n -1 et S2n constitue la paire binaire du code Manchester, représentative du énième bit dans un flux de données ayant une période binaire T. Le traitement de ces signaux permet la détection de la plupart des collisions, puisque les règles de codage Manchester sont trangressées pendant plus de la moitié du temps dans le signal formé par les paquets venant en collision. Afin d'assurer une détection de collisions à 100 %, un préambule utilisant une infraction intentionnelle au code Manchester dans la configuration 10 11 01 10 est avantageusement utilisé dans chaque paquet de données, et une collision est signalée lors de la détection de deux infractions de codage ou plus.

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