Some fax machines send a little less than the specified 1.5 seconds of training test data, so the training test failed every time. I now only look for 1.25seconds of training test data.
You may even have to go as low as 1.00 sec., by the way.
Some fax machines do not correctly initialise the scrambler in their V.29 transmit modem. I have changed the software to tolerate this.
This is probably off-topic on-list (feel free to respond privately), but can you elaborate?
Some fax machines send a burst of ones before the burst of zeros that forms the training test data.
This is actually quite normal. And in the case of a Class 1 transmitter, it is virtually impossible to avoid. For example, a DTE using a Class 1 modem can send TCF by issuing the AT+FTM=145 followed by the transmission of the requisite zero-fill as soon as the CONNECT response is received. However, per T.31 spec (8.3.3), the Class 1 modem will already have transmitted a series of consecutive 1s before the 0s begin. I know of no way to avoid this.
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