Pulse or digital communications – Cable systems and components
Reexamination Certificate
2005-10-14
2010-02-02
Payne, David C (Department: 2611)
Pulse or digital communications
Cable systems and components
C375S259000, C713S300000, C370S254000, C370S257000, C370S419000, C370S487000, C370S490000, C370S442000
Reexamination Certificate
active
07656956
ABSTRACT:
A system and method for conveying supervisory signaling and power over the same twisted wire pairs in a cable as are used to carry data communications in accordance with a predetermined communications protocol. Supervisory signals having first and second differential components are generated. The first component is coupled to both wires of one of the twisted wire pairs as a common mode signal and the second component of the supervisory signal is coupled to both wires of another twisted pair as a common mode signal. The first and second components are recovered at the remote end of the cable. Physical interfaces are AC coupled to the respective twisted pairs at both ends of the cable and positive and negative voltage rails powered by a power sourcing device are coupled to predetermined twisted pairs to convey a DC voltage over the cable which may be used to power a remote electronic device.
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Curtis Anthony P.
Kassa Zewdu
Motorola Inc.
Payne David C
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