Message transmission system

Details Message transmission system Message transmission system

2005-08-02

2005-08-02

Duong, Frank (Department: 2666)

Multiplex communications

Channel assignment techniques

Details of circuit or interface for connecting user to the...

C370S485000, C370S493000

Reexamination Certificate

active

06925091

ABSTRACT:
An information transmission system for simultaneously transmitting baseband signals and broadband signals via a two-wire line between a central office and at least one subscriber. In one embodiment, a shared bidirectional splitter filter mounted on a circuit board communicates in one direction toward the subscriber over a subscriber line, and communicates in an opposite direction toward the central office. A baseband communication unit and a broadband communication unit are mounted on the circuit board, and at least one hybrid circuit is interposed between the filter and the baseband unit and broadband units. A central interface control unit is also mounted on the circuit board. The central interface control unit communicates in one direction toward the central office, and communicates in an opposite direction toward the baseband and broadband units. In another embodiment, the bidirectional filter is replaced with a plurality of unidirectional filters and a shared hybrid circuit.

REFERENCES:
patent: 5613191 (1997-03-01), Hylton et al.
patent: 5756280 (1998-05-01), Soora et al.
patent: 5982785 (1999-11-01), Woerner et al.
patent: 4444312 (1996-02-01), None
patent: WO 93/06602 (1993-04-01), None
patent: WO 97/11534 (1997-03-01), None
ANSI T1E1.4/97-016, Zipper-a duplex scheme for VDSL based on DMT, Telia Research AB, pp. 1-12, Feb. 3-7, 1997.

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