METHODS AND APPARATUS PROVIDING ADVANCED CLASSIFICATION FOR POWER OVER ETHERNET
First Claim
1. A method for classifying power sourcing equipment coupled to a powered device, the powered device configured to receive inline power from the power sourcing equipment in a wired network having at least two pairs of conductors coupling the powered device and the power sourcing equipment, the method comprising:
- detecting a cycle on the at least two pairs of conductors of the powered device, the cycle having a detection phase, a classification phase, and a signature phase following the classification phase;
a classification phase voltage being detected on the conductors during the classification phase, and wherein a current is drawn from the conductors while the classification voltage is detected;
a signature phase voltage being detected on the conductors during the signature phase, and wherein a magnitude of the signature phase voltage has an upper bound below a lower bound of a magnitude of the classification voltage; and
identifying a type of the power sourcing equipment based on the signature phase voltage.
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Abstract
A system conducts a plurality of cycles on the powered device. Each cycle has a detection phase and a classification phase. A classification voltage is applied to the conductors during each cycle. The system measures a current in the conductors while the classification voltage is applied. The system determines a final class responsive to a plurality of measured currents. The final class utilized to determine an amount of inline power to deliver to the powered device.
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Citations
15 Claims
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1. A method for classifying power sourcing equipment coupled to a powered device, the powered device configured to receive inline power from the power sourcing equipment in a wired network having at least two pairs of conductors coupling the powered device and the power sourcing equipment, the method comprising:
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detecting a cycle on the at least two pairs of conductors of the powered device, the cycle having a detection phase, a classification phase, and a signature phase following the classification phase;
a classification phase voltage being detected on the conductors during the classification phase, and wherein a current is drawn from the conductors while the classification voltage is detected;
a signature phase voltage being detected on the conductors during the signature phase, and wherein a magnitude of the signature phase voltage has an upper bound below a lower bound of a magnitude of the classification voltage; andidentifying a type of the power sourcing equipment based on the signature phase voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A powered device adapted to operate in conjunction with coupled power sourcing equipment so that the powered device can receive inline power from the power sourcing equipment in a wired network having at least two pairs of conductors coupling the powered device and the power sourcing equipment, the powered device comprising:
circuitry responsive to a cycle on the at least two pairs of conductors, the cycle having a detection phase, a classification phase, and a signature phase following the classification phase, wherein the cycle is generated by the power sourcing equipment, and the circuitry configured to; present a current over the conductors to the power sourcing equipment responsive to a classification voltage applied during the classification phase of the cycle, detect a signature phase voltage on the conductors during the signature phase, wherein a magnitude of the signature phase voltage has an upper bound below a lower bound of a magnitude of the classification voltage, and identify a type of the power sourcing equipment based on the signature phase voltage. - View Dependent Claims (7, 8, 9, 10)
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11. A system comprising:
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a power sourcing equipment; a powered device; a wired network having at least two pairs of conductors coupling the powered device and the power sourcing equipment; and a memory on the powered device, the memory is encoded with a power source equipment classifying application that when executed on a processor configures the processor to perform an operation for classifying the power source equipment, the operation including; detecting a cycle on the at least two pairs of conductors coupled to the powered device, the cycle having a detection phase, a classification phase, and a signature phase following the classification phase;
a classification voltage being detected on the conductors during the classification phase, and wherein a current is drawn from the conductors while the classification voltage is detected;
a signature phase voltage detected on the conductors during the signature phase, and wherein a magnitude of the signature phase voltage has an upper bound below a lower bound of a magnitude of the classification voltage; andidentifying a type of the power sourcing equipment based on the signature phase voltage. - View Dependent Claims (12, 13, 14, 15)
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Specification