Pre-detection of powered devices
First Claim
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:
- operating power sourcing equipment to provide via its output port a pre-detection output voltage;
obtaining an indication of said pre-detection output voltage;
comparing said indication of said pre-detection output voltage with a pre-determined value; and
in the event that said indication of said pre-detection output voltage is less than said pre-determined value;
initiating a probing routine for a valid powered device detection signature.
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Accused Products
Abstract
A method and apparatus for preventing harmful transients resulting from a probing routine for a valid powered device detection signature in a network, the method comprising: operating power sourcing equipment to provide via its output port a pre-detection output voltage; obtaining an indication of the pre-detection output voltage; comparing the indication of the pre-detection output voltage with a pre-determined value; and in the event that the indication of the pre-detection output voltage is less than the pre-determined value; initiating a probing routine for a valid powered device detection signature. The higher voltage of the probing routine is thus not present at the output port in the absence of pre-detection of a potentially valid powered device detection signature.
94 Citations
36 Claims
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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:
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operating power sourcing equipment to provide via its output port a pre-detection output voltage;
obtaining an indication of said pre-detection output voltage;
comparing said indication of said pre-detection output voltage with a pre-determined value; and
in the event that said indication of said pre-detection output voltage is less than said pre-determined value;
initiating a probing routine for a valid powered device detection signature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Power sourcing equipment for detecting and powering a valid powered device in an Ethernet network, the power sourcing equipment comprising:
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one of a voltage source and a current source;
an output port; and
control circuitry;
said control circuitry being operable to;
provide from said one of a voltage source and a current source via said output port a pre-detection output voltage;
obtain an indication of said pre-detection output voltage;
compare said obtained indication of said pre-detection output voltage with a pre-determined value; and
in the event that said obtained indication of said pre-detection output voltage is less than said pre-determined value;
initiate a probing routine for a valid powered device detection signature. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for preventing harmful transients while enabling detection of a valid powered device detection signature in a network, the method comprising:
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operating power sourcing equipment to provide via its output port a first output voltage;
obtaining an indication of said first output voltage;
comparing said obtained indication of said first output voltage with a pre-determined value; and
in the event that said obtained indication of said first output voltage is less than said pre-determined value;
operating said power sourcing equipment to provide via its output port a second output voltage thereby probing for a valid powered device detection signature.
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31. A method for detecting a valid powered device detection signature in a network, the method comprising:
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operating power sourcing equipment to provide via its output port a first voltage;
measuring said first voltage at said output port;
comparing said measured first voltage with a pre-determined value; and
in the event that said measured first voltage is less than said pre-determined value;
operating said power sourcing equipment to provide via its output port at least two additional voltages;
measuring said at least two additional voltages at said output port; and
determining a valid powered device detection signature utilizing said measured first voltage and said measured two additional voltages. - View Dependent Claims (32)
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33. A method for preventing harmful transients while enabling detection of a valid powered device detection signature in a network, the method comprising:
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operating power sourcing equipment to provide via its output port two first output voltages;
obtaining an indication of each of said two first output voltages;
determining a difference between said obtained indication of said two first output voltages;
comparing said determined difference with a pre-determined value; and
in the event that said determined difference is less than said pre-determined value;
operating said power sourcing equipment to provide via its output port a second output voltage thereby probing for a valid powered device detection signature. - View Dependent Claims (34, 35)
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36. A system for detecting and powering a valid powered device in an Ethernet network comprising:
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a powered device; and
power sourcing equipment coupled by communication cabling to said powered device, said power sourcing equipment being operable to;
provide via its output port a pre-detection voltage;
obtain an indication of said pre-detection voltage at said output port;
compare said obtained indication of said pre-detection voltage at said output port with a pre-determined value; and
in the event that said obtained indication is less than said pre-determined value;
initiate a probing routine for a valid powered device detection signature.
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Specification