Method and apparatus for single end loop testing for DSL provisioning and maintenance
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United States of America Patent
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Dec 2, 2008
Grant Date -
Jul 28, 2005
app pub date -
Jan 14, 2005
filing date -
Jan 14, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for single end loop testing for DSL provisioning and maintenance provides testing of the DSL loop using digital techniques including frequency compensation, matched filtering and median filtering, to remove strong background and enhance desired signal for peak detection. The SELT system allows DSL providers to extract loop information from reflective measurements at the central office (CO) so as to determine loop capability of supporting different DSL services. The method and apparatus acquires the desired signal (the far-end echo) which is submerged in the correlated background noise (the near-end echo) by providing a process for detecting loop length and termination types with high accuracy for loops up to 12 kft for 24 AWG and up to 9 kft for 26 AWG by exploiting several digital signal processing techniques including frequency.
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