Subscriber connection circuit comprising feed resistors which ca

Details Subscriber connection circuit comprising feed resistors which ca Subscriber connection circuit comprising feed resistors which ca

Filed on

1983-02-09

Date issued

1985-12-31

Examiner

Rubinson, Gene Z.

Other Related Categories

179 18HB, 179 84R, H04Q 300, H04M 322

Type

Patent

Status

active

Patent number

045623082

Description

ABSTRACT:
A subscriber connection circuit comprises heat resistors which can be bridged in a low-ohmic manner and an indication circuit which effects different indication functions. Four different operating states are possible, characterized by the nature of the feed, the switching threshold for the indication circuit, and the actuation of a filter element for the indication circuit, two of which operating modes represent the ringing phase and the ringing interval. During the ringing interval, the nature of the feed and the threshold voltage are identical to those in the conversation operating state, but in contrast thereto the filter element is actuated.

REFERENCES:
patent: 4301334 (1981-11-01), Lechner
patent: 4320260 (1982-03-01), Lechner
patent: 4336424 (1982-06-01), Lechner
patent: 4396805 (1983-08-01), Wagner
patent: 4443669 (1984-04-01), Kopetzky
patent: 4446338 (1984-05-01), Rosch

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