Dynamic upstream attenuation for ingress noise reduction

Details Dynamic upstream attenuation for ingress noise reduction Dynamic upstream attenuation for ingress noise reduction

2006-02-28

2010-06-22

Dao, Minh D (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S067130, C455S522000, C455S014000, C455S523000, C725S124000

Reexamination Certificate

active

07742777

ABSTRACT:
A dynamic arrangement for reducing the presence of ingress noise in the upstream signal path of a two-way cable system utilizes a variable attenuation element and amplifier disposed along the upstream signal path. The amplifier includes a bypass switch so that the amplifier may be switched in to or out of the upstream path. A signal processor associated with the communications gateway functions to calculate the upstream loss present at the gateway and control the operation of the attenuation element, amplifier and bypass switch accordingly. Upstream attenuation is selected to be as large as possible, yet still allow in-building cable devices to communicate with their associated head end (HE) receiver equipment, after accounting for maximum transmit limitations.

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