Patent ID: 7613235

Claim:
In a communications system having a first modem transmitting via a communications channel, a method for adding a second modem for communication via said communications channel, the method comprising: configuring said second modem for receiving communications via said communications channel; learning crosstalk caused by transmissions from said first modem via said communications channel to said second modem while said second modem is in a transmitting state insufficient to cause crosstalk interference to said first modem in accordance with a predefined measure; deriving from said learned crosstalk an estimation of crosstalk that would be caused by said second modem to said first modem when said second modem is in a transmitting state; configuring said first modem to cancel crosstalk according to said crosstalk estimation; causing said second modem to enter a transmitting state sufficient to cause crosstalk interference to said first modem in accordance with a predefined measure; and causing said first modem to at least partially cancel crosstalk caused by said second modem in accordance with said crosstalk estimation.