A gateway controls a portion of lighting fixtures within a lighting system in response to a first digital signal and comprises a power input port to receive AC power, a power line filter to filter electrical noise from the received AC power, a power output port to output the filtered AC power to the portion of lighting fixtures, an input signal port to receive the first digital signal, an output signal port to pass the received first digital signal to a second gateway, a local controller, a first transceiver coupled to the input signal port to receive the first digital signal, and a second transceiver coupled to the power output port to couple the second digital signal to the power output port.