Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of data transmission
Reexamination Certificate
2006-09-05
2006-09-05
Tsang, Fan (Department: 2646)
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of data transmission
C379S377000, C379S027010, C379S027030, C379S027080
Reexamination Certificate
active
07103147
ABSTRACT:
Embodiments of the invention provide methods and apparatuses to determine the characteristics of a local loop using the multi-tone line-probing signals of a standard voice-based modem. For one embodiment, the multi-tone, line-probing signals of a voice-band modem are transmitted over a local loop and received at a standard voice band modem. Discrete Fourier transform values are determined for each of two or more frequencies of the plurality of frequencies of the multi-tone signals. A set of discrete Fourier transform values corresponding to a set of high frequencies is summed to obtain a first value and a set of discrete Fourier transform values corresponding to a set of low frequencies is summed to obtain a second value. A power ratio is determined by dividing the first value by the second value. The power ratio is then used to determine a characteristic of the local loop.
REFERENCES:
patent: 6549587 (2003-04-01), Li
patent: 6570912 (2003-05-01), Mirfakhraei
patent: 6671312 (2003-12-01), Lanier et al.
patent: 2002/0034220 (2002-03-01), Duxbury
Krishna Vedavalli G.
Krishnan Mandayam G.
Qiu Sigang
Smith Wesley H.
Tawade Prashant Pratap
Blakely , Sokoloff, Taylor & Zafman LLP
Intel Corporation
Singh Ramnandan
Tsang Fan
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