System and method for communication using an AC signal from a powered device
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United States of America Patent
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Oct 12, 2010
Grant Date -
Apr 24, 2008
app pub date -
Oct 18, 2006
filing date -
Oct 18, 2006
priority date (Note) -
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Abstract
A system and method for communicating information using Layer 1 from a powered device to power source equipment via Ethernet. In one embodiment, Layer 1 information such as power management, classification, temperature, and disconnect information is transmitted from a powered device to power source equipment using an AC signal that has a cycle defining a first time period during which the AC signal is turned on and a second time period during which the AC signal is turned off. A type of information being sent by the powered device can be determined based on characteristic on/off times of the AC signal cycle.
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