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:
Jun. 10, 2008
Filed:
Apr. 27, 2004
Applicants:
David E. Dodds, Saskatoon, CA;
Bernardo Celaya, Saskatoon, CA;
Terence Monteith, Saskatoon, CA;
Inventors:
Assignee:
Telecommunications Research Laboratory, Edmonton, Alberta, CA;
Primary Examiner:
Int. Cl.
CPC ...
H04J 1/16 (2006.01); H04J 3/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A technique for estimating distances and the nature of irregularities and faults on a telephone subscriber line is disclosed. Reflected test signals are measured as a function of frequency. The measurements are compensated for variable propagation velocity and variable line attenuation and then weighted before transformation with the Fourier transform. The amplitude and phase of peaks in the spectral domain identify the distances to the irregularities and the magnitude and phase angle of the reflection coefficients.