Apparatus and method for multi-point detection in power-over-Ethernet detection mode
First Claim
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1. A method, in a power-over-Ethernet power source equipment (PSE) device, for multi-point detection of a powered device (PD), comprising:
- sequentially applying a plurality of currents or voltages to a link port of the PSE device;
obtaining a plurality of current samples or voltage samples that correspond to respective currents or voltages applied to the link port;
calculating a link port settling voltage for the PD by calculating a difference between a second voltage sample in the plurality of voltage samples and a first voltage sample in the pluralitv of voltage samples;
calculating a signature resistance for the PD by calculating a difference between a third voltape sample in the plurality of voltage samples and the second voltage sample; and
determining, based on the signature resistance and the link port settling voltage, whether the PD is a valid PD.
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Abstract
An apparatus and method for multi-point detection in a power source equipment (PSE) device is provided. During multi-point detection, a series of at least four currents is sequentially applied to a link port of the PSE device. Each current is applied during a different measurement interval. A voltage measurement sample is obtained for each of the measurement intervals. A difference in voltage between alternating voltage samples is determined and used by a detection module to determine whether a valid power device is coupled to the link port of the PSE.
94 Citations
24 Claims
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1. A method, in a power-over-Ethernet power source equipment (PSE) device, for multi-point detection of a powered device (PD), comprising:
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sequentially applying a plurality of currents or voltages to a link port of the PSE device; obtaining a plurality of current samples or voltage samples that correspond to respective currents or voltages applied to the link port; calculating a link port settling voltage for the PD by calculating a difference between a second voltage sample in the plurality of voltage samples and a first voltage sample in the pluralitv of voltage samples; calculating a signature resistance for the PD by calculating a difference between a third voltape sample in the plurality of voltage samples and the second voltage sample; and determining, based on the signature resistance and the link port settling voltage, whether the PD is a valid PD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power source equipment (PSE) device for multi-point detection of a powered device (PD), comprising:
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a current or voltage source configured to sequentially apply a plurality of currents or voltages to a link port of the PSE device; a measurement system configured to measure a plurality of current samples or voltage samples that correspond to respective currents or voltages applied to the link port; and a detection module configured to; calculate a link port settling for the PD by calculating a difference between a second voltage sample in the plurality of voltage samples and a first voltage sample in the plurality of voltage samples, calculate a signature resistance for the PD by calculating a difference between a third voltage sample in the plurality of voltage samples and the second voltage sample, and determine, based on the signature resistance and the link port settling voltage, whether the PD is a valid PD. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus, comprising:
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a current or voltage source configured to sequentially apply a plurality of currents or voltages to a link port of the apparatus; a measurement system configured to measure a first voltage sample, corresponding to a first measurement point, a second voltage sample, corresponding to a second measurement point, and a third voltage sample, corresponding to a third measurement point, from the link port; and a detection module configured to; calculate a signature resistance for a device by calculating a difference between the third voltage sample and the second voltage sample, calculate a link port is settling voltage for the device by calculating a difference between the second voltage sample and the first voltage sample, and determine, based on the signature resistance and the link port settling voltage, whether the device is a valid powered device (PD). - View Dependent Claims (24)
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Specification