Communication method and apparatus using data compression

H - Electricity – 04 – B

Patent

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Details

H04B 7/005 (2006.01) H04B 7/185 (2006.01)

Patent

CA 2224711

A communications link for data communication via satellite includes interface apparatus (12) comprising a satellite link interface (20) for connection to a satellite link and a PSTN interface (22) for connection to a PSTN (14). The interface apparatus (12) supports different data compression modes in the communications link. Mode A allows data compression over the PSTN (14) but not over the satellite link. Mode B allows data compression over the PSTN (14) and over the satellite link, but enables decompression and recompression of data flowing in each direction through the interface apparatus (12). Mode C allows compressed data to pass transparently between the PSTN (14) and the satellite link, while the interface apparatus performs error correction on the satellite link and on the PSTN (14).

En télécommunication, la liaison assurant la transmission de données par satellite décrite comprend un dispositif d'interface (12) qui comporte une interface de liaison satellite (20), assurant la connexion à une liaison satellite, et une interface de réseau téléphonique public commuté (22), assurant la connexion à un RTPC (14). L'interface (12) fonctionne selon différents modes de compression de données utilisés pour la liaison. Le mode A permet la compression des données passant par le RTPC (14), mais pas de celles passant par la liaison satellite. Le mode B permet la compression des données passant par le RTPC (14) et par la liaison satellite, mais permet la décompression et la recompression des données traversant l'interface (12) dans les deux directions. Le mode C permet aux données compressées de passer de manière transparente entre le RTPC (14) et la liaison satellite, tandis que l'interface effectue la correction des erreurs au niveau de la liaison satellite et du RTPC (14).

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