Patent ID: 8054867

Claim:
An apparatus for transmitting data and additional information within a wire based communication system, said apparatus comprising: a wired medium adapted to carry said data and additional information; a transmitter combined with a spread spectrum receiver electrically coupled to said wired medium, adapted to transmit said data over a first frequency band of said wired medium; a receiver combined with a spread spectrum transmitter electrically coupled to said wired medium, the spread spectrum transmitter being adapted to spread said additional information over a second frequency band of said wired medium so that said second frequency band at least partially overlaps said first frequency band, and transmit to the spread spectrum receiver said spreaded additional information over said wired medium simultaneously with said data; and a line driver electrically coupled to said wired medium and adapted to transmit said data and said additional information over said wired medium; wherein said wired medium carries said data in one direction and carries said spreaded additional information in an opposite direction, and wherein said spread spectrum transmitter further comprises common mode circuitry adapted to inject said spreaded additional information into said wired medium and the common mode circuitry including: at least two termination resistors adapted to inject common mode current representing said spreaded additional information into said wired medium and a correlator adapted to despread said spreaded additional information, the correlator including: a despreading mixer electrically coupled to said common mode circuitry and adapated to despread said spreaded additional information, and integrate and dump circuitry adapted to convert said despreaded additional information to phase information and despreaded, encoded additional information.