Variable length burst transmission over the physical layer...

H - Electricity – 04 – L

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Details

H04L 12/56 (2006.01) H04L 1/00 (2006.01) H04L 12/28 (2006.01) H04L 29/02 (2006.01) H04Q 11/04 (2006.01) H04L 1/18 (2006.01) H04N 7/16 (2006.01)

Patent

CA 2235373

Apparatus is provided for communicating data packets in variable length bursts over a physical layer in a multilayer data communication scheme. Each burst contains information data (40, 50, 60, 64, 74, 78, 82) and overhead (30, 32, 34, 36, 38, 42, 44, 62, 66, 76, 80, 84). The overhead includes forward error control (FEC) data (42, 62, 66, 76, 80, 84). Different burst modes (Figs. 2, 3, 4, 5) are provided to enable a trade-off to be made between bandwidth efficiency and data transmission robustness. The burst modes provide different combinations of modulation (such as QPSK and 16-QAM), symbol rates, FEC coding levels and frame and preamble structure. The apparatus is particularly suitable for use in upstream communications over hybrid fiber coax cable television plants.

Cette invention concerne un appareil de transmission de paquets de données en salves de longueur variable sur la couche physique d'un système de transmission de données multicouche. Chaque salve contient des données d'information (40, 50, 60, 64, 74, 78, 82) et des données de service (30, 32, 34, 36, 38, 42, 44, 62, 66, 76, 80, 84). Ces données de service comportent des données (42, 62, 66, 76, 80, 84) servant à la correction des erreurs sans voie de retour (FEC). L'invention concerne différents modes de transmission par salves (FIG.2, 3, 4, 5) qui permettent de parvenir à un compromis entre indice d'occupation spectrale et fiabilité de la transmission des données. Les modes de transmission par salves assurent différentes combinaisons de modulation (de type QPSK et 16-QAM), de débits de symboles, de niveaux de codage FEC et de structure de trame et de préambule. Ledit appareil convient particulièrement aux transmissions montantes sur des réseaux hybrides de télévisions reliées par câbles coaxiaux à fibres optiques.

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