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DETECTION FOR HIGH POWERED DEVICES

  • US 20060171399A1
  • Filed: 03/27/2006
  • Published: 08/03/2006
  • Est. Priority Date: 10/16/2003
  • Status: Active Grant
First Claim
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1. A local area network adapted to supply power to a plurality of types of powered devices over communication cabling, the local area network comprising:

  • a powered device comprising at least one signature impedance;

    a first powering source;

    a second powering source; and

    communication cabling comprising a plurality of twisted wire pairs arranged to connect said first and second powering source to said powered device, said communication cabling providing a first power path comprising a first set of twisted wire pairs of said communication cabling between said first powering source and said powered device and a second power path comprising a second set of twisted wire pairs of said communication cabling between said second powering source and said powered device, said first set being different from said second set, said first powering source being operable to;

    apply a plurality of voltages to said powered device via said first path so as to attempt to detect a first one of said at least one signature impedance, and in the event said first one of said at least one signature impedance is detected, to at least partially classify the power requirements of said powered device by supplying a classification voltage to said powered device via said first path and measuring the resultant current flow, said classification voltage level being higher than each of the plurality of detection voltage levels;

    said second powering source being operable to apply at least one voltage to said powered device via said second path so as to attempt to detect a second one of said at least one signature impedance at least partially contemporaneously with said supplied classification voltage of said first powering source.

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