Patent ID: 8155143

Claim:
A data transmission system, comprising: a first data bridge receiving data from a first data port, further including a first data coupler to provide a first data path to a selected one of an AC mains circuit at a first data port coupler AC mains port, a twisted-pair cable at a first data port coupler twisted-pair port and a coaxial cable at a first data port coupler coaxial cable port; a second data path having a transmission line characteristic different from said selected one of said AC mains circuit, said twisted-pair cable and said coaxial cable; and a second data coupler comprising a three-port data coupler including a second data coupler AC mains port, a second data coupler twisted-pair port, and a second data coupler coaxial cable port having a first of said three data ports connected to said selected one of said AC mains circuit said twisted-pair cable and said coaxial cable and a second of said three ports connected to said second data path.