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-

1996-10-23

1998-04-21

Healy, Brian

Optical waveguides

With optical coupler

Plural

385 15, 385100, 385147, 359111, 359113, 359161, 455 51, 455 63, G02B 628, H04K 300, H04H 100

Patent

active

057427135

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: 5235619 (1993-08-01), Beyers, II et al.
patent: 5255086 (1993-10-01), McMullan, Jr. et al.
patent: 5528582 (1996-06-01), Bodeep et al.
patent: 5606725 (1997-02-01), Hart

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