Data access arrangement

Details Data access arrangement Data access arrangement

1995-06-30

1998-02-10

Zele, Krista M.

Telephonic communications

Subscriber line or transmission line interface

379387, 379412, 370359, H04M 900

Patent

active

057177520

ABSTRACT:
A digital access arrangement, coupled between a data terminal equipment having a transmit line and a receive line and tip and ring lines of a network, having a circuit that provides polarity check, hook/switch control, and data modulation functionality. The circuit includes a controller and six controllable switches, each having a conducting state and a blocking state.

REFERENCES:
patent: 4056719 (1977-11-01), Waaben
patent: 4456991 (1984-06-01), Chea, Jr. et al.
patent: 4700380 (1987-10-01), Ahuja
patent: 4815126 (1989-03-01), Goode et al.
patent: 5384837 (1995-01-01), Fox
patent: 5548229 (1996-08-01), Segawa et al.
patent: 5555293 (1996-09-01), Krause
patent: 5604785 (1997-02-01), Pryor et al.

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