A communication system includes a first transmission channel with a first end and a second end. The first and second ends are coupled to first and second transformers. First and second end transceivers transmit and receive signals via the first and second transformers. A first signal is supplied at the...http://www.google.fr/patents/US8050645?utm_source=gb-gplus-shareBrevet US8050645 - Active resistive summer for a transformer hybrid
