Power sourcing unit for power over ethernet system

Abstract

A circuit board for a power sourcing unit for a power over ethernet system. The circuit board includes a power over ethernet controller. The circuit board also includes a switch connected to the power over ethernet controller. The switch switches a polarity of an output voltage controlled by the power over ethernet controller. The circuit board can also include a microcontroller to control a state of the switch. The switch can include a first state for a first output voltage polarity, and a second state for a second output voltage polarity that is opposite to that of the first state. The switch can be a latching relay. The circuit board can include a plurality of relays, one relay for each jack of the power sourcing unit. The circuit board can also include a second switch to switch transmit and receive pairs controlled by the power over ethernet controller.

Dependencies are inferred from the claim text.