Patent ID: 8863213

Claim:
A method for using information carried by optical fiber to prevent a first narrowcast set of RF signals from being transmitted from a first segment of a conductive cable to a connected second segment of said conductive cable, while allowing a second broadcast set of RF signals to be transmitted from said first segment to said second segment, said first segment and said second segment being connected by a junction, said method comprising: obtaining a first narrowcast set of information from an HFC head, RF modulating said first narrowcast set of information, and transmitting said RF modulated first narrowcast set of information over said first segment; optically modulating said first narrowcast set of information, and transmitting said optically modulated first narrowcast set of information over said optical fiber; obtaining a second broadcast set of information from said HFC head, RF modulating said second broadcast set of information, and transmitting said RF modulated second broadcast set of information over said first segment; at said junction, obtaining said optically modulated first narrowcast set of information, and using said optically modulated first narrowcast set of information to create a reference signal to adaptively cancel said RF modulated first narrowcast set of information, thereby preventing said RF modulated first narrowcast set of information from crossing said junction, while permitting said RF modulated second broadcast set of information to cross said junction from said first segment to said second segment.