Methods, systems, and computer program products for managing power allocation to a device powered over a network communications cable based on a cable characteristic
First Claim
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1. A method for managing power allocation to a device powered over a communications cable, the method comprising:
- (a) connecting a powered device to power source equipment via a communications cable;
(b) determining anticipated power consumption of the powered device;
(c) determining at least one characteristic of the cable, wherein determining at least one characteristic of the cable includes determining a length of the cable based on length read from an equalizer cable length register associated with an equalizer implemented in a physical layer chip of a network interface in the power source equipment; and
(d) allocating an amount of power at the power source equipment to the powered device based on the anticipated power consumption and the cable characteristic.
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Abstract
Methods, systems, and computer program products for managing power allocation to a device powered over a communications cable based on a cable characteristic are disclosed. In one example, a method of managing power allocation to a device powered over a communications cable can include providing a power source for connecting to a powered device via a communications cable. An anticipated power loss of the device is determined. A characteristic of the cable is determined. Power allocated to the device is then set based on the anticipated power consumption and the characteristic.
82 Citations
36 Claims
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1. A method for managing power allocation to a device powered over a communications cable, the method comprising:
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(a) connecting a powered device to power source equipment via a communications cable; (b) determining anticipated power consumption of the powered device; (c) determining at least one characteristic of the cable, wherein determining at least one characteristic of the cable includes determining a length of the cable based on length read from an equalizer cable length register associated with an equalizer implemented in a physical layer chip of a network interface in the power source equipment; and (d) allocating an amount of power at the power source equipment to the powered device based on the anticipated power consumption and the cable characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 35)
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15. A system for managing power allocation to a device powered over a communications cable, the system comprising:
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a. a network interface for connecting to a powered device via a communications cable; b. a power source for providing power to the powered device via the network interface and the communications cable; c. a power management application located in power source equipment (PSE) for determining an anticipated power consumption of the powered device and at least one characteristic associated with the cable and for allocating an amount of power to the powered device based on the anticipated power consumption and the characteristic; and (d) a memory located in the PSE and storing a table, wherein the table stores pre-calculated power dissipation values for different cable lengths and resistances and wherein the power management application is adapted to determine the amount of power to be allocated by accessing one of the pre-calculated power dissipation values in the table. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A computer program product comprising computer executable instructions embodied in a computer readable medium for performing steps comprising:
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a. determining anticipated power consumption of a powered device for connecting to power source equipment via a communications cable and receiving power from the power source equipment via the communications cable; b. determining a characteristic of the cable, wherein determining at least one characteristic of the cable includes determining a length of the cable based on length read from an equalizer cable length register associated with an equalizer implemented in a physical layer chip of a network interface in the power source equipment; and c. based on the power consumption and the characteristic, allocating an amount of power at power source equipment for powering the powered device. - View Dependent Claims (31, 32, 33, 34, 36)
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Specification