1981-08-13
1984-04-17
Pellinen, A. D.
179 18FA, H04M 322
Patent
active
044436696
ABSTRACT:
A subscriber connection circuit comprising an improvement for analyzing the reliability of operating states of a subscriber connection circuit without involving a substantial increase in cost over those used in known telecommunication systems which employ a central analyzing device for a plurality of subscriber connection lines. In the invention, the dialing state is monitored and loop interruptions due to dialing and clearance and of loop closure resulting from a call are monitored with subscriber individual analyzing devices which are each connected through separate voltage dividers R1 to R4 and R6 to R12 and by means of a plurality of feed resistors RS1 through RS7 and which are actuated depending upon the nature of the monitoring which is to be accomplished wherein the monitoring of the dialing state and of the loop interruption is accomplished using the same analyzing device and wherein switchover means from one type of monitoring to the other can be made by changing the divider ratio in the associated voltage dividers and their connection points to specific feed resistors. The voltage dividers and the feed resistors form a single structural unit that can be easily mounted at the subscriber connection point.
REFERENCES:
patent: 4132864 (1979-01-01), Feng
patent: 4320260 (1982-03-01), Lechner
Dwyer James L.
Pellinen A. D.
Siemens Aktiengesellschaft
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