Patent ID: 7319280

Claim:
A coupling system for interfacing a high-frequency power line communications (PLC)-enabled communication device and a low-frequency PLC-enabled communications device with a low-voltage power network, the system comprising: a first coupling device that includes a high-frequency transformer having a first primary side and a first secondary side, wherein the first primary side is electrically coupled to the high-frequency communications device, and the first secondary side is capacitively coupled to a first power line of the power line network via a first capacitor; a second coupling device that includes a low-frequency transformer having a second primary side and a second secondary side, wherein the second primary side is electrically coupled to the low-frequency communication device, and the second secondary side is capacitively coupled to the first power line of the power line network via a second capacitor; wherein the second coupling device is adapted to appreciably abate at least one of distortion and attenuation of high-frequency signals passing through the first coupling device.