Patent ID: 7002931

Claim:
An apparatus for concurrently transmitting an outgoing differential signal on a twisted pair in response to an input signal and for amplifying an incoming differential signal arriving on the twisted pair to produce an output signal, the apparatus comprising: first, second, third and fourth nodes (N 1 –N 4 ); a first resistor (R 1 ) coupling the first node to the third node; a second resistor (R 2 ) coupling the second node to the fourth node; first means ( 75 ) for inductively coupling the first and second nodes to the twisted pair; second means for responding to the input signal by supplying a first current (I 1 ) to the first node and by supplying a second current (I 2 ) to the second node; third means ( 88 A) responding to the first and second currents by providing first compensation current (I 6 –I 8 ) into the third node of magnitude influenced by both the first and second currents; and fourth means ( 88 B) for responding to the first and second currents by providing second compensation current (I 12 –I 13 ) into the fourth node, of magnitude influenced by both the first and second currents.