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Home Television Bidirectional-CATV-system-having-losses-for-equalizing-upstream-communication-gain

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Details
Inventors: Stoneback, Dean A.; Beck, William F.; Huang, Zheng F.;
Assignee: General Instrument Corporation (Horsham, PA)
Primary Examiner: Faile; Andrew I.
Assistant Examiner: Miller; John W.
Attorney, Agent or Firm: Volpe and Koenig, P.C.

A gain variance and ingress reduction system reduces the overall ingress of interferers for an entire CATV system return transmission path and allows a reduction in subscriber terminal return transmitter power. The system places a calculated loss at each subscriber tap location. By placing these losses at each subscriber location, the headend receives a more consistent return transmission path gain thereby reducing the terminal return transmitter power range requirement. In addition, the losses reduce return transmission path ingress.

DETAILED DESCRIPTION The CATV system of the present invention reduces the overall ingress of the entire CATV system return path and allows a reduction in terminal return transmitter power.
The gain variance and ingress reduction system places a calculated loss at each subscriber tap location.
By placing these losses at each subscriber location, the headend receives a more consistent return path gain thereby reducing the terminal return transmitter power range requirement.
In addition, the losses reduce return path ingress.
Accordingly, it is an object of the present invention to provide a system for reducing gain variances and interference ingress manifest on CATV return signal transmissions.
It is a further object of the invention to provide a method of interference reduction whereby a loss is placed at each subscriber tap location.
It is a further object of the invention to provide a method of interference reduction whereby the loss can be a flat loss or a passive equalizer.
Other objects and advantages of the system and method will become apparent to those skilled in the art after reading the detailed description of the preferred embodiment.



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