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Pre-detection of powered devices

  • US 7,849,343 B2
  • Filed: 06/07/2004
  • Issued: 12/07/2010
  • Est. Priority Date: 06/10/2003
  • Status: Active Grant
First Claim
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1. A method for preventing harmful transients resulting from a probing routine for a valid powered device detection signature in a network, the method comprising:

  • providing a pre-detection voltage to the output port of a power sourcing equipment via an impedance, said provided pre-detection voltage restricted so that voltage at the output port in the absence of a load across the output port is less than a predetermined threshold at which damaging transients can occur, said predetermined threshold less than or equal to 5 volts;

    obtaining an indication of voltage at the output port of the power sourcing equipment responsive to said provided pre-detection voltage;

    comparing said obtained indication of voltage at the output port of the power sourcing equipment responsive to said provided pre-detection voltage with a pre-determined value; and

    initiating, only in the event that said obtained indication of voltage at the output port of the power sourcing equipment responsive to said provided pre-detection voltage is less than said pre-determined value, a probing routine for a valid powered device detection signature.

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