Modem wake-up in support of cross-talk cancellation in a...

Details Modem wake-up in support of cross-talk cancellation in a... Modem wake-up in support of cross-talk cancellation in a...

2007-03-06

2007-03-06

Tran, Khai (Department: 2637)

Pulse or digital communications

Transceivers

Modems

C375S285000, C370S201000, C379S417000

Reexamination Certificate

active

09721759

ABSTRACT:
In a communications system having a first modem pool for communicating with a second modem pool, each modem pool including a plurality of modems and having at least one NEXT cancellation filter, a method for modem wake-up including the steps of, during a first time period, a) activating at least one of the modems in the first modem pool, b) deactivating at least one of the modems in the second modem pool, for at least one target modem in the first modem pool c) activating the first modem pool NEXT canceller filter, d) measuring the NEXT transfer function for the target modem and at least one other disturber modem in the first modem pool, and, during a second time period, e) activating at least one of the modems in the second modem pool, f) deactivating at least one of the modems in the first modem pool, for at least one target modem in the second modem pool g) activating the second modem pool NEXT canceller filter, and h) measuring the NEXT transfer function for the target modem and at least one other disturber modem in the second modem pool.

REFERENCES:
patent: 5825753 (1998-10-01), Betts et al.
patent: 5887032 (1999-03-01), Cioffi
patent: 5970088 (1999-10-01), Chen
patent: 6160790 (2000-12-01), Bremer
patent: 6201796 (2001-03-01), Agazzi et al.
patent: 6633894 (2003-10-01), Cole
patent: 6687288 (2004-02-01), Shteiman
U.S. Appl. No. 09/510,550, filed Feb. 22, 2000, Barlev et a.

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