Apparatus and method for measuring loop insertion loss single-endedly
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United States of America Patent
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Mar 24, 2009
Grant Date -
Nov 15, 2007
app pub date -
May 24, 2007
filing date -
Jan 18, 2005
priority date (Note) -
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Abstract
A system for determining insertion loss of a telephone line under test (LUT) predicts a length d of the LUT at each of a number of discrete frequencies. The system determines for each predicted length d a running standard deviation that is a function of the predicted length(s) d at and below the frequency where the predicted length d was determined; and determines a mean length (dm) of the LUT as a function of the lengths d of the LUT determined for each frequency at and below the pair of adjacent frequencies where the largest difference between running standard deviations occurs. The system determines a gauge of the LUT as a function of the running standard deviation the one of said pair of adjacent frequencies; and determines an insertion loss value of the LUT as a function of the gauge and the mean length dm.
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