Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of trunk or long line
Reexamination Certificate
2005-01-18
2005-01-18
Barnie, Rexford (Department: 2643)
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of trunk or long line
C379S001030, C379S027010, C379S417000
Reexamination Certificate
active
06845149
ABSTRACT:
A system and method of communicating between a central office and a plurality of subscriber sites. Subscriber sites are separated into frequency groups. Each group spans a distance along the cable such that no more than a predetermined amount of attenuation is required to equalize the signal power of signals sent from a site in the group. Frequency groups closer to the central office are assigned higher frequency bands than frequency groups farther away from the central office. The central office includes a plurality of filters, each of which has a passband for passing the frequency band of a group and a stop band that substantially attenuates the frequencies of the other groups. The frequency group nearest the central office has no filter. The passband of a filter may also provide any needed attenuation to assure that signals arriving at the central office have approximately the same power levels.
REFERENCES:
patent: 5668802 (1997-09-01), Chalmers et al.
patent: 6229855 (2001-05-01), Takatori et al.
patent: 6697487 (2004-02-01), Getchell
Barnie Rexford
Fischer Felix L.
UTStarcom Inc.
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