Method for controlling modem

H - Electricity – 04 – M

Patent

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Details

H04M 11/06 (2006.01) H04L 1/00 (2006.01) H04L 5/14 (2006.01) H04N 1/32 (2006.01) H04N 1/333 (2006.01)

Patent

CA 2246497

When a MODEM controller detects that the receiving level of probing signals or tone signals having a specific frequency in the phase 2 of a precommunication procedure is lower than a prescribed value, the controller lowers the transmission speed of a control channel to a lower speed of 1,200 bps. When the controller lowers the transmission speed, the controller sets the transmission speed to 1,200 bps by using a prescribed bit in an MPh signal in a communication control procedure and, at the same time, executes communication at the lowered transmission speed by setting such a condition that the communication with the communication equipment on the remote side at a different transmission speed is not permitted by using another bit of the MPh signal and informing the communication equipment on the remote side of the set condition.

Lorsqu'une unité de commande de Modem détecte que le niveau de réception de signaux de signaux d'essai ou de signaux sonores ayant une fréquence spécifique dans la phase 2 d'une procédure de communication est inférieur à une valeur prédéterminée, il réduit la vitesse de transmission d'un canal de commande à une vitesse inférieure de 1 200 bps. Lorsque l'unité de commande réduit la vitesse de transmission, elle l'ajuste à 1 200 bps en utilisant un bit prédéterminé d'un signal MPh dans une procédure de commande de communication et, exécute simultanément la communication à la vitesse de transmission réduite de sorte que la communication avec l'équipement de communication du côté éloigné à une vitesse de transmission différente ne soit pas possible au moyen d'un autre bit du signal MPh et en informant l'équipement de communication du côté éloigné.

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