A method and apparatus for data transfer over existing or newly installed residential or commercial power lines is comprised of a transmitter and receiver unidirectionally communicating by phase cutting a portion of the received carrier voltage supply so as to receive a digital signal of low bandwidth. The resulting communication method is known as phase cut carrier, or PCC. The phase cut carrier communication method is shown to be able to addressably communicate lighting level commands for various types of lighting. In other embodiments, the phase cut carrier method may be used to control the powered status of addressably or nonaddressably controlled equipment.
STATEMENT REGARDING FEDERAL FUNDING
 This invention was made with U.S. Government support under Contract Number DE-AC03-76SF00098 between the U.S. Department of Energy and The Regents of the University of California for the management and operation of the Lawrence Berkeley National Laboratory. The U.S. Government has certain rights in this invention.