Hitless modem pool expansion at steady state

In a communications system having a modem pool for communicating via a communications channel, the modem pool having a plurality of modems, a method for modem pool expansion comprising:

• adding a new modem into said modem pool, wherein said new modem is operative to communicate via said communications channel;
• learning crosstalk caused by transmissions from any of said plurality of modems via said communications channel to said added modem while said added modem is in a transmitting state insufficient to cause crosstalk interference to any of said plurality of modems in accordance with a predefined measure;
• deriving from said learned crosstalk an estimation of crosstalk that would be caused by said added modem to any of said plurality of modems when said added modem is in a transmitting state;
• configuring any of said plurality of modems to cancel crosstalk according to said crosstalk estimation;
• causing said added modem to enter a transmitting state sufficient to cause crosstalk interference to any of said plurality of modems in accordance with a predefined measure;
• and
• causing any of said plurality of modems to at least partially cancel crosstalk caused by said added modem in accordance with said crosstalk estimation.

A communications system having a first modem transmitting via a communications channel, and a second modem for communication via said communications channel, the system comprising:

• means for configuring said second modem for receiving communications via said communications channel;
• means for 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;
• means for 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;
• means for configuring said first modem to cancel crosstalk according to said crosstalk estimation;
• means for 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
• means for causing said first modem to at least partially cancel crosstalk caused by said second modem in accordance with said crosstalk estimation.

A communications system having a modem pool for communicating via a communications channel, the modem pool having a plurality of modems, the system comprising:

• means for adding a new modem into said modem pool wherein said new modem is operative to communicate via said communications channel;
• means for learning crosstalk caused by transmissions from any of said plurality of modems via said communications channel to said added modem while said added modem is in a transmitting state insufficient to cause crosstalk interference to any of said plurality of modems in accordance with a predefined measure;
• means for deriving from said learned crosstalk an estimation of crosstalk that would be caused by said added modem to any of said plurality of modems when said added modem is in a transmitting state;
• means for configuring any of said plurality of modems to cancel crosstalk according to said crosstalk estimation;
• means for causing said added modem to enter a transmitting state sufficient to cause crosstalk interference to any of said plurality of modems in accordance with a predefined measure;
• and
• means for causing any of said plurality of modems to at least partially cancel crosstalk caused by said added modem in accordance with said crosstalk estimation.