Cable modem
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United States of America Patent
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Feb 5, 2013
Grant Date -
Mar 31, 2011
app pub date -
Mar 9, 2010
filing date -
Sep 30, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A cable modem includes a subscriber line interface circuit (SLIC) that is connected to a telephone. The cable modem can send a signal to the telephone through the SLIC, and detect signal reflection of the telephone in the SLIC. The cable modem measures frequencies of the signal reflection and the output of the telephone. The cable modem also compares the measured frequencies with corresponding thresholds and self-determines to be qualified or unqualified, based upon the comparisons.
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