Power line communication method and apparatus

System, for transmitting and receiving signals over residential electrical cables comprising at least one active wire, one neutral wire and one ground wire, said system comprising:

• at least two power line modems, each one of said at least two power line modems coupling a respective electrical device with a respective electrical socket, each said respective electrical socket being coupled with said residential electrical cables,
• each one of said at least two power line modems comprising:
• a processor;
• a plurality of transmitters, coupled with said processor, for transmitting said signals;
• and
• at least one receiver, coupled with said processor, for receiving said signals,
• wherein said processor determines a frequency carrier wave for said signals when said signals are transmitted;
• wherein at least one of said plurality of transmitters and said at least one receiver comprising a coupling circuit for coupling said one of said at least two power line modems to said residential electrical cables, said coupling circuit comprising:
• a first transformer, comprising:
• a first network side winding;
• a first modem side winding;
• and
• a center tap,
• each of said first network side winding and said first modem side winding respectively comprising two terminals, a first terminal of said first network side winding being coupled with said at least one active wire and a second terminal of said first network side winding being coupled with said at least one neutral wire, said center tap extending from a midpoint between said two terminals of said first network side winding;
• a second transformer, comprising:
• a second network side winding;
• and
• a second modem side winding,
• each of said second network side winding and said second modem side winding respectively comprising two terminals, a first terminal of said second network side winding being coupled with said center tap and a second terminal of said second network side winding being coupled with said at least one ground wire;
• wherein at least one receive wire pair is formed from at least two of said at least one active wire, said at least one neutral wire, said at least one ground wire and said midpoint;
• wherein at least one transmit wire pair is formed from at least two of said at least one active wire, said at least one neutral wire, said at least one ground wire and said midpoint;
• wherein said processor enables said at least one receiver to be coupled with said at least one receive wire pair and said plurality of transmitters to be coupled with said at least one transmit wire pair;
• wherein each one of said plurality of transmitters defines a respective carrier wave set over said at least one transmit wire pair, and
• wherein said processor provides said signals to a respective one of said plurality of transmitters according to said respective carrier wave set said frequency carrier wave of said signals is in.