PASSIVE SYSTEM USED TO MERGE TELEPHONY AND BROADBAND SIGNALSONTO ONE COAXIAL CABLE

摘要

An apparatus and a method for simultaneously transporting telephone signals and broadband signals on a single coaxial cable (204). The ring line and tip line of the telephone signals are dc coupled onto the inner (212) and outer (214) conductors of the coaxial cable, while the information wire and reference ground of the broadband signal are ac coupled onto the inner and outer conductors of the coaxial cable respectively. Low pass filters at each end of the coaxial cable pass the telephone signal in and out of telephone jacks while blocking the broadband signals. High pass filters at each end of the coaxial cable allow the broadband signals to pass in and out of coaxial connectors while blocking the telephone signals. The coaxial cable is isolat ed from earth ground to prevent shorting of the telephone electrical power to earth ground. A ground block may be added to connect the reference ground of the incoming broadband signal to earth ground. The ground block may include surge suppression to protect the information wire of the incoming broadband signal.