Power management mechanism in system for supplying power over communication link
First Claim
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1. A power supply system comprising:
- multiple power supply ports for providing power to respective powered devices via multiple communication links, a power-in-use bus shared by the multiple power supply ports, the power-in-use bus being configured for receiving a power-in-use signal representing total amount of power being used by the powered devices, and multiple port control circuits associated with the multiple power supply ports and responsive to the power-in-use signal for controlling supply of power to the respective powered devices.
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Abstract
System and methodology for managing power supplied to powered devices over communication links, such as Ethernet links. A power supply system has multiple power supply ports for providing power to respective powered devices via multiple communication links. A power-in-use bus shared by the multiple power supply ports is configured for receiving a power-in-use signal representing total amount of power being used by the powered devices. Multiple port control circuits associated with the power supply ports are responsive to the power-in-use signal for controlling supply of power to the respective powered devices.
51 Citations
23 Claims
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1. A power supply system comprising:
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multiple power supply ports for providing power to respective powered devices via multiple communication links, a power-in-use bus shared by the multiple power supply ports, the power-in-use bus being configured for receiving a power-in-use signal representing total amount of power being used by the powered devices, and multiple port control circuits associated with the multiple power supply ports and responsive to the power-in-use signal for controlling supply of power to the respective powered devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A Power over Ethernet (PoE) system comprising:
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multiple PoE ports for supplying power to respective powered devices, the ports being assigned with priorities corresponding to priorities of the respective powered devices, a power indication bus shared by the multiple PoE ports, the bus being configured to receive a power indication signal indicating total power associated with the powered devices, and multiple port control circuits associated with the multiple power supply ports and responsive to the power indication signal for controlling supply of power to the respective powered devices in accordance with the priorities of the powered devices. - View Dependent Claims (17, 18)
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19. A method of supplying power from multiple power supply ports to respective powered devices over communication links, comprising the steps of:
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detecting a powered device linked to a power supply port of the multiple power supply ports, determining amount of power demanded by the powered device, placing a power demand signal representing the demanded power onto a power allocation bus shared by the multiple power supply ports, determining a priority of the detected powered device, detecting on the power allocation bus, a total power allocation signal representing a total amount of power allocated to the powered devices, and if the total power allocation signal exceeds a preset power allocation threshold level, denying a request for power from the detected powered device after expiration of a time interval corresponding to the priority of the detected powered device. - View Dependent Claims (20)
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21. A method of supplying power from multiple power supply ports to respective powered devices over communication links, comprising the steps of:
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detecting on a power-in-use bus shared by the multiple power supply ports, a power-in-use signal representing a total amount of power being used by the powered devices, and if the power-in-use signal exceeds a preset power-in-use threshold level, removing power supplied to a powered device having a lowest priority among powered device currently supplied with power. - View Dependent Claims (22, 23)
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Specification