Line circuit for telecommunications exchange using TDM

Details Line circuit for telecommunications exchange using TDM Line circuit for telecommunications exchange using TDM

1974-10-21

1976-12-14

Claffy, Kathleen

H04J 302

Patent

active

039977382

ABSTRACT:
Disclosed is a line circuit providing the normal line circuit functions and key system control functions within an exchange using time division switching. The line circuit may be used interchangeably for key telephones or non-key telephones. In the former case, the circuit provides the well-known key telephone features for multiple line access at each station of a plurality of stations. Each line circuit provides electronic signalling controls, such as lamp flash indicating a call awaiting an answer, lamp wink indicating a line is on a hold condition, and the fully lit line busy indication, together with audible controls for a called line, and also provides an inverted flash signal at the line circuit for trouble or problem situations.

REFERENCES:
patent: 3244815 (1966-05-01), Anderson et al.
patent: 3385935 (1968-05-01), Anderson et al.
patent: 3420961 (1969-01-01), Averill, Jr.
patent: 3453396 (1969-07-01), Lacey et al.
patent: 3715516 (1973-02-01), Ebrahimi
patent: 3787631 (1974-01-01), Lewis
patent: 3789152 (1974-01-01), Medill et al.
patent: 3914559 (1975-10-01), Knollman

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