Apparatus and method for multi-point detection in power-over-Ethernet detection mode
AssigneeBroadcom Corporation
InventorsAgnes Woo, Anil Tammineedi, Ichiro Fujimori, David Chin, John Perzow
Life of this patent
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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.
Claims24
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.
A power source equipment (PSE) device for multi-point detection of a powered device (PD), comprising:
- 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.
An apparatus, comprising:
- 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).
Dependencies are inferred from the claim text.