Dual-mode detection of powered device in power over ethernet system
First Claim
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1. A system for providing power to a Powered Device (PD), comprising:
- PD detection circuitry for detecting the PD in a first mode by providing detection current to probe the PD, and in a second mode by providing detection voltage to probe the PD, and a control circuit for determining that the PD is a valid device if the PD is detected both in the first mode and in the second mode.
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Abstract
Novel circuitry and methodology for detecting a Powered Device (PD) in a system for providing power to the PD. PD detection circuitry detects the PD in a first mode by providing detection current to probe the PD, and in a second mode by providing detection voltage to probe the PD. A control circuit determines that the PD is a valid device if the PD is detected both in the first mode and in the second mode.
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Citations
20 Claims
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1. A system for providing power to a Powered Device (PD), comprising:
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PD detection circuitry for detecting the PD in a first mode by providing detection current to probe the PD, and in a second mode by providing detection voltage to probe the PD, and a control circuit for determining that the PD is a valid device if the PD is detected both in the first mode and in the second mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Power Sourcing Equipment (PSE) in a Power over Ethernet (PoE) system, comprising:
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a PD detection source for detecting a PD in a force-current mode and a force-voltage mode, and a control circuit for validating the PD if the PD is detected in both the force-current mode and the force-voltage mode. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of detecting a PD, comprising the steps of:
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determining a prescribed parameter of the PD in a force-current mode, determining the prescribed parameter of the PD in a force-voltage mode, and validating the PD if the prescribed parameter of the PD is found to be valid in both the force-current mode and the force-voltage mode. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification