Negotiable PoE Voltage for Improved Efficiency Based on Cable and Powered Device Losses
First Claim
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1. A method comprising:
- at a powered device (PD) configured to receive a Power-over-Ethernet (PoE) voltage to power the PD over a cable from a Power Source Equipment (PSE) that is configured to output a requested one of multiple candidate PoE voltages to the cable;
determining a preferred PoE voltage among the multiple candidate PoE voltages that minimizes a total power loss due to (i) the cable, and (ii) a power loss of the PD that would result if the PD were powered through the cable;
requesting the preferred PoE voltage from the PSE;
receiving the preferred PoE voltage from the PSE; and
operating at the preferred PoE voltage.
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Abstract
A powered device (PD) receives a Power-over-Ethernet (PoE) voltage to power the PD over a cable from Power Source Equipment (PSE) configured to output a requested one of multiple candidate PoE voltages to the cable. The PD determines a preferred PoE voltage among the multiple candidate PoE voltages that minimizes a total power loss due to (i) the cable, and (ii) a power loss of the PD that would result if the PD were powered through the cable. The PD requests the preferred PoE voltage from the PSE, receives the preferred PoE voltage from the PSE, and operates at the preferred PoE voltage.
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Citations
24 Claims
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1. A method comprising:
at a powered device (PD) configured to receive a Power-over-Ethernet (PoE) voltage to power the PD over a cable from a Power Source Equipment (PSE) that is configured to output a requested one of multiple candidate PoE voltages to the cable; determining a preferred PoE voltage among the multiple candidate PoE voltages that minimizes a total power loss due to (i) the cable, and (ii) a power loss of the PD that would result if the PD were powered through the cable; requesting the preferred PoE voltage from the PSE; receiving the preferred PoE voltage from the PSE; and operating at the preferred PoE voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
a powered device (PD) configured to receive a Power-over-Ethernet (PoE) voltage to power the PD over a cable from a Power Source Equipment (PSE) that is configured to output a requested one of multiple candidate PoE voltages to the cable, wherein the PD includes a controller to; determine a preferred PoE voltage among the multiple candidate PoE voltages that minimizes a total power loss due to (i) the cable, and (ii) a power loss of the PD that would result if the PD were powered through the cable; request the preferred PoE voltage from the PSE; receive the preferred PoE voltage from the PSE; and operate at the preferred PoE voltage. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A system comprising:
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a powered device (PD) configured to receive a Power-over-Ethernet (PoE) voltage to power the PD over a cable, the PD including a PD controller; and Power Source Equipment (PSE), including; a voltage generator to generate multiple candidate PoE voltages and output a selected one of the PoE voltages to the cable to power the PD; and a PSE controller coupled to the voltage generator; wherein the PD and the PSE are configured to negotiate with each other to; determine a preferred PoE voltage among the multiple candidate PoE voltages that minimizes a total power loss due to (i) the cable, and (ii) a PD power loss that would result if the PD were powered by the PSE through the cable; and cause the PSE to provide the preferred PoE voltage to the cable to power the PD. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification