Powered device interface circuit
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United States of America Patent
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Dec 5, 2006
Issued Date -
N/A
app pub date -
Oct 12, 2004
filing date -
Oct 16, 2003
priority date (Note) -
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Abstract
A method for communicating multi-bit data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising: exhibiting a signature indicative of a device to be powered over communication cabling; sensing a voltage level indicative of remote powering over communication cabling; prior to connecting power to operational circuitry, transmitting first multi-bit information; subsequently to the transmitting first multi-bit information, connecting power received over the communication cabling to the operational circuitry; receiving information from the operational circuitry; subsequent to receiving the information disconnecting the received power from the operational circuitry; subsequent to the disconnecting, transmitting second multi-bit information associated with the operational circuitry, the second multi-bit information comprising at least one bit being a function of the received information; and re-connecting power received over the communication cabling to the operational circuitry.
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