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Providing power over ethernet cables

  • US 7,921,314 B2
  • Filed: 10/05/2009
  • Issued: 04/05/2011
  • Est. Priority Date: 05/13/2004
  • Status: Expired due to Term
First Claim
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1. A method comprising, by one or more computing devices:

  • determining whether a powered device receiving power from a power delivery system requires less power than it is receiving from the power delivery system, the powered device receiving power from the power delivery system on all four wire pairs of an Ethernet cable coupling the powered device to the power delivery system;

    if the powered device requires less power, causing power to be provided to the powered device on fewer than all the wire pairs;

    determining, based on power information from the powered device communicated using a network discovery protocol, whether a power requirement of the powered device exceeds a predetermined threshold; and

    if the power requirement exceeds the predetermined threshold, causing power to be provided to the powered device on all the wire pairs.

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