Methods and filter for isolating upstream ingress noise in a bi-

Details Methods and filter for isolating upstream ingress noise in a bi- Methods and filter for isolating upstream ingress noise in a bi-

1996-05-09

1998-04-07

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling function

G02B 634

Patent

active

057374619

ABSTRACT:
An upstream ingress filter (300) for isolating upstream ingress noise on a bi-directional cable system having an upstream band and a downstream band for carrying upstream signals and downstream signals, respectively. The upstream ingress filter (300) includes a DC switching element (310) for changing the DC voltage on the cable system at said cable access unit and a switchable notch filter (340) that switches ON and OFF in response to the DC switching element. The notch filter isolates upstream ingress noise by attenuating upstream signals in the upstream band when the upstream ingress filter is ON. Both the DC switching element (310) and the notch filter (340) are connected in parallel to the cable (301).

REFERENCES:
patent: 5109286 (1992-04-01), West, Jr. et al.
patent: 5243647 (1993-09-01), Parikh et al.
patent: 5528582 (1996-06-01), Bodeep et al.
patent: 5590173 (1996-12-01), Beasley
patent: 5604528 (1997-02-01), Edwards et al.

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