Coupling circuit for coupling a power line communication device to a power line network, including a first network port, a second network port, a third network port, a first modem port, a second modem port, a third modem port, a fourth modem port, a first transformer, a second transformer, a third transformer and at least two capacitors, the first transformer including a first network side winding including two terminals, a first modem side transmitter winding including two terminals, a first modem side receiver winding including two terminals and a center tap, extending from a midpoint between the two terminals of the first network side winding, the second transformer including a second network side winding including two terminals and a second modem side receiver winding including two terminals, the third transformer including a third network side winding including two terminals and a second modem side transmitter winding including two terminals.