Non-intrusive cable connection monitoring for use in HFC networks
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United States of America Patent
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Jun 14, 2005
Grant Date -
Sep 16, 2004
app pub date -
Mar 14, 2003
filing date -
Mar 14, 2003
priority date (Note) -
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Abstract
A method and an apparatus are employed for individually monitoring the connectivity status of cables connected at a cable modem termination system (CMTS), where the cables conduct upstream and downstream RF communication signals. The monitoring is self-contained within the CMTS. The monitoring is achieved by producing a reference signal having a frequency outside the frequency range of the RF communication signals. The reference signal is injected onto the RF communication signal. The power level of the reference signal is detected within the CMTS, whereby the power level correlates with an expected cable load impedance. A DC control voltage based on the detected power level of the reference signal is generated, which allows a controller to determine the connectivity statuses of the connected cables.
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