Texas Instruments Incorporated
POWER-OVER-ETHERNET (PoE) CONTROL SYSTEM

Abstract:

A method that may be used for power-over-Ethernet includes generating and sending a first pulse of a voltage signal during a classification phase, receiving a current that is responsive to the first pulse, and determining a nominal power of a powered device (PD) from the current. The method also includes generating and sending a quantity of pulses of the voltage signal subsequent to the first pulse during the classification phase, the quantity of pulses including a command to operate the PD at less than the nominal power level during an operational phase subsequent to the classification phase.