System and method for power over ethernet signaling
First Claim
1. A system for securing power transfer from a network location over a network communication cable to a device, the system comprising:
- a device security module operable to communicate security information through the network communication cable by varying current draw at the device from the cable; and
a network security module operable to receive the security information from the device security module through the network communication cable by detecting the varying current draw, to verify authorization of the device to receive power, and to perform a predetermined action if the device lacks authorization to receive power.
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Accused Products
Abstract
Network communication cables that provide power, such as Ethernet cables in compliance with the Power over Ethernet standard, are secured so that unauthorized devices are restricted from receiving power. After a PoE connection is established between a powered device (PD) and power source equipment (PSE) over an Ethernet cable, the PD communicates security information to the PSE with low frequency variations in the current drawn by the PD through the Ethernet cable. The PSE terminates power to the PD if the PD fails to communicate the security information in a predetermined time period or if the security information fails to match authorized security information. Alternatively, the PSE generates an unauthorized device message for presentation at the network if the security information fails to match the authorized security information.
39 Citations
20 Claims
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1. A system for securing power transfer from a network location over a network communication cable to a device, the system comprising:
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a device security module operable to communicate security information through the network communication cable by varying current draw at the device from the cable; and
a network security module operable to receive the security information from the device security module through the network communication cable by detecting the varying current draw, to verify authorization of the device to receive power, and to perform a predetermined action if the device lacks authorization to receive power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for securing power transfer from a network location through a network communication cable to a device, the method comprising:
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connecting the device to the network communication cable;
providing power from the network location through the network communication cable to the device;
varying current drawn by the device from the network communication cable in a predetermined pattern;
detecting the predetermined pattern at the network location;
continuing power from the network location if the predetermined pattern matches a security pattern; and
terminating the power from the network location if the predetermined pattern fails to match the security pattern. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for securing power transfers through a network communication cable, the method comprising:
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detecting connection of a device to the network communication cable;
providing power to the device through the network communication cable;
monitoring the power provided to the device for a predetermined pattern; and
terminating the power provided to the device if the predetermined pattern is not detected for a predetermined time. - View Dependent Claims (17, 18, 19, 20)
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Specification