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System and method for continual cable thermal monitoring using cable resistance considerations in power over ethernet

  • US 7,814,346 B2
  • Filed: 03/12/2007
  • Issued: 10/12/2010
  • Est. Priority Date: 03/12/2007
  • Status: Active Grant
First Claim
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1. A power over Ethernet method, comprising:

  • establishing a current threshold for a delivery of power over an Ethernet cable to a powered device, said current threshold being identified based on an initial static power classification of said powered device;

    periodically receiving operating voltage data from said powered device;

    estimating a resistance of an Ethernet cable that couples said powered device to a power source equipment port using one of said received operating voltage data;

    determining whether a difference between said estimated resistance and a prior estimated resistance is greater than a determination threshold;

    reducing said current threshold for said power source equipment port if it is determined that said difference is greater than said determination threshold; and

    increasing a current threshold for said power source equipment port if it is determined that said difference is not substantial, wherein said increased current threshold enables said powered device to receive a dynamically adjusted amount of power greater than said initial static power classification.

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