The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2009
Filed:
Dec. 21, 2001
Gin Liu, Brampton, CA;
Andrew Dempster, Norcross, GA (US);
Mike M. J. Wingrove, Kanata, CA;
Gwendolyn Kate Harris, Ottawa, CA;
Michel M. Darveau, Aylmer, CA;
Leslie Humphrey, Harlow, GB;
Mohammed Reza Pakravan, Shariaty, IR;
Gin Liu, Brampton, CA;
Andrew Dempster, Norcross, GA (US);
Mike M. J. Wingrove, Kanata, CA;
Gwendolyn Kate Harris, Ottawa, CA;
Michel M. Darveau, Aylmer, CA;
Leslie Humphrey, Harlow, GB;
Mohammed Reza Pakravan, Shariaty, IR;
Nortel Networks Limited, Montreal, Quebec, CA;
Abstract
Method and apparatus for retrieving the channel frequency response H(f), the noise N(f), measured at initialization and the signal to noise ratio SNR(f) measured at show time on a per bin basis, in the upstream or downstream direction. Initialization H(f) is used for analyzing the physical copper loop condition between tip and ring. Initialization N(f) is used for analyzing the crosstalk. Showtime SNR(f) is used for analyzing time dependent changes in crosstalk levels and line attenuation. The combination of H(f), N(f) and SNR(f) allows analysis of the line conditions for reaching the maximum data rate of a given loop, scheduling maintenance and plant update.