Switching arrangement for telecommunication switching systems

Details Switching arrangement for telecommunication switching systems Switching arrangement for telecommunication switching systems

1976-03-22

1977-09-20

Robinson, Thomas A.

H04M 322

Patent

active

040499227

ABSTRACT:
A telecommunication switching arrangement is described wherein those switching elements that are idle are marked at a given test point with a free or idle potential, and those which are currently in use, or busy, are marked by an absence of the foregoing potential. The condition indicated at the test point is sensed by test switches on a preceding switching element which, using a test and seizing circuit, attempts to seize the switching element in question. When a switching element is busy, it is guarded by a potential differing from the idle potential. In the course of a connection release and while an inhibited test and seizure circuit is opened, seizure attempts on the opening seizure circuit are prevented. A current monitoring device recognizes a decrease in current flow as a release and opens the seizing circuit until the switching element in question is completely released.

REFERENCES:
patent: 3601560 (1971-08-01), Garrett et al.

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