Interactive video distribution systems – Video distribution system with upstream communication – Transmission network
Reexamination Certificate
2005-04-12
2005-04-12
Grant, Chris (Department: 2611)
Interactive video distribution systems
Video distribution system with upstream communication
Transmission network
C725S126000, C725S127000, C725S129000
Reexamination Certificate
active
06880170
ABSTRACT:
The present invention encompasses a method and apparatus for ingress detection and attenuation. When a determination is made that the level of ingress in a return frequency band has exceeded a predetermined threshold, the return path is attenuated or disconnected at a communications gateway device located at or substantially near the subscriber location. By disconnecting the return path or attenuating the return path signal at or near the subscriber location, ingress is reduced and locations which are the cause of severe ingress are effectively isolated. This allows for a high degree of reliability to be maintained on the return path, and insures that critical services like cable telephony can be provided.
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Blum William H.
Eldering Charles
Kauffman Marc W.
Sherlock Peter
Strater Jay
General Instrument Corporation
Grant Chris
Koba Wendy W.
Marley Robert P.
Rockett Esteban A.
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