Modem control method

Details Modem control method Modem control method

H - Electricity

04

M

H04M 11/06 (2006.01) H04L 5/14 (2006.01) H04N 1/32 (2006.01) H04N 1/333 (2006.01)

Patent

CA 2245900

When carrying out pre-processing of image signal transmission using the control channel of a full-duplex modem and switching image signal transmission to the primary channel of a half-duplex modem, the answer modem stops the transmission carrier upon confirmation that all "1" signals with 40 bit or more have been received from the calling modem, restarts the reception of all "1" signals after the elapse of a certain period of time, confirms the end of all "1" signals and switches to the primary channel.

Le prétraitement de la transmission de signaux d'images est mis en oeuvre sur une voie de commande d'un modem duplex intégral. Lors du transfert des signaux d'images vers une voie primaire d'un modem semi-duplex, lorsqu'un appelé confirme que 40 bits ou plus des signaux tout à '1' ont été reçus en provenance d'un appelant, une porteuse de transmission est interrompue, et la réception des signaux tout à '1' redémarre après écoulement d'un laps de temps préétabli. Lorsque la fin des signaux tout à '1' est confirmée, on bascule la transmission des signaux d'images sur la voie primaire.

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