In a particular embodiment, a circuit device is disclosed that includes a power sourcing equipment (PSE) circuit having a plurality of high-voltage line circuits adapted to communicate with a respective plurality of powered devices via network cables. The PSE circuit includes a serial interface circuit and includes a common controller coupled to the serial interface circuit and to the plurality of high-voltage line circuits. The circuit device also includes a low-voltage circuit having a programmable controller adapted to transmit control signals to the common controller via the serial interface circuit to control operation of the plurality of high-voltage line circuits.