Distinguishing network interface card from short circuit condition in power over ethernet system
First Claim
1. A system for providing power to a powered device (PD) in a Power over Ethernet (PoE) system, comprising:
- a PD probing circuit for determining a response signal produced in response to a detection signal supplied to a device being probed, and a control circuit responsive to a detection value determined based on the response signal, the control circuit being configured for determining that a short circuit condition is detected if the detection value is in a first predetermined range, and determining that a Network Interface Card is detected if the detection value is in a second predetermined range outside of the first predetermined range.
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Accused Products
Abstract
Novel system and methodology for distinguishing a Network Interface Card (NIC) from a short circuit condition in a Power over Ethernet (PoE) system. A system for providing power to a powered device (PD) includes a PD probing circuit that generates a detection signal supplied to a device being probed and determines a response signal produced in response to the detection signal, and a control circuit that determines a detection value based on the response signal. The control circuit detects a short circuit if the detection value is in a first predetermined range, and detects a NIC if the detection value is in a second predetermined range outside of the first predetermined range.
37 Citations
19 Claims
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1. A system for providing power to a powered device (PD) in a Power over Ethernet (PoE) system, comprising:
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a PD probing circuit for determining a response signal produced in response to a detection signal supplied to a device being probed, and a control circuit responsive to a detection value determined based on the response signal, the control circuit being configured for determining that a short circuit condition is detected if the detection value is in a first predetermined range, and determining that a Network Interface Card is detected if the detection value is in a second predetermined range outside of the first predetermined range. - 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 probing circuit for determining a first response voltage produced in response to a first detection current supplied to a device being probed, and a detection circuit responsive to the probing circuit to determine a detection resistance value indicating a resistance of the device being probed, the detection circuit is configured for determining that a short circuit condition is detected if the detection resistance value is in a first predetermined range, and determining that a Network Interface Card is detected if the resistance detection value is in a second predetermined range outside of the first predetermined range. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of detecting a powered device (PD) in a Power over Ethernet (PoE) system, comprising the steps of:
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producing a first detection signal supplied to a device being probed to determine a first response signal, and producing a second detection signal larger than the first detection signal if the first response signal is less than a threshold value. - View Dependent Claims (16, 17, 18, 19)
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Specification