coupling in accordance with one embodiment of the present invention is illustrated the self contained plc is packaged in a weatherproof housing 102 to militate against harsh weather and environment conditions the pv power line 14 passes through sealed openings in the container a data signal coupler 104 couples and de couples data signals transported by the pv power line 14 one embodiment of the present invention uses a magnetic toroid shaped inductor windings 108 are placed around the inductor 104 to facilitate flux linkage of the data signal the number of windings and the winding orientation is selected to maximize flux linkage the permeability of the magnetic core is chosen for maximum coupling with the high frequency data signal the permeability characteristics must also prevent low frequency 50 60 hz power line signal saturation of the toroid core to allow the data signal to couple and de couple the toroid has direct electrical connection to the signal conditioning electronics used for transmitting and receiving the data signal transmit and receive circuitry 110 carries data signal to signal conditioning electronic components as depicted in fig6 the transmit circuitry 112 and the receive circuitry 114 are in parallel another embodiment of the present invention employs two data signal.