Determining the composition of subscriber loops from...

Details Determining the composition of subscriber loops from... Determining the composition of subscriber loops from...

2005-07-05

2005-07-05

Tran, Quoc (Department: 2643)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of trunk or long line

C379S001010, C379S022020, C379S024000

Reexamination Certificate

active

06914963

ABSTRACT:
Techniques for estimating distances to irregularities on a subscriber loop are described. A loop response is measured in the frequency domain. The loop response is weighted by a prolate spheroidal wave function to yield a weighted response. The weighted response is transformed to a spectral domain, and peaks in the spectral domain are identified as the distances to the irregularities.

REFERENCES:
patent: 3904839 (1975-09-01), Peoples
patent: 5526426 (1996-06-01), McLaughlin
patent: 5881130 (1999-03-01), Zhang
patent: 5917809 (1999-06-01), Ribner et al.
patent: 5949236 (1999-09-01), Franchville
patent: 6417672 (2002-07-01), Chong
patent: 6466649 (2002-10-01), Walance et al.
patent: 6487276 (2002-11-01), Rosen et al.

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