Patent ID: 7312904

Claim:
A communication apparatus having a capability of communication according to the ITU-T recommendation V.17, comprising: training information storage means for storing training information when long training information is received; success in reception-of-short-training detection means for detecting success in receiving short training; high-speed data detection means for detecting highspeed data; training information setting means for setting the stored training information into a modem; reception control changing means for changing reception control in response to detection of the success in receiving the short training and detection of the high-speed data, wherein if, after a CFR signal is transmitted, the highspeed data is detected and the success in receiving the short training is also detected, said reception control changing means does not set the training information, which was stored when the long training information is received, into the modem, and wherein if, after the CFR signal is transmitted, the high-speed data is detected but the success in receiving the short training is not detected, said reception control changing means sets the training information, which was stored when the long training information is received, into the modem; and transmission means for transmitting the CFR signal according to the ITU-T recommendation V.21.