Patent Number: 6,295,313

Title: Method for controlling modem

Abstract: When the present modem control apparatus detects that the receive level ofa probing signal in phase 2 of the pre-communication procedure or a tonesignal with a specific frequency in phase 2 of the pre-communicationprocedure is lower than a prescribed value, it sets the transmission rateof the control channel to a low rate of 1200 bps. In this case, the modemcontrol apparatus sets the transmission rate to 1200 bps through aprescribed bit of the MPh signal in the communication control procedureand performs the setting that will not permit communications with theanswer modem at different transmission rates, through the secondprescribed bit of said MPh signal, and notifies those settings to theanswer modem, thus carrying out communications at a lower transmissionrate.

Inventors: Noma; Nobuhiko (Yokohama, JP), Araki; Mitsuhiro (Kawasaki, JP)


International Classification:

Expiration Date: 09/25/2013