Means for avoiding double connections in telephone multiplex systems and the like

Claim 1

A CIRCUIT ARRANGEMENT FOR AVOIDING DOUBLE CONNECTIONS IN A SWITCHING SYSTEM, PARTICULARLY IN A TELEPHONE SYSTEM, HAVING STORERS FOR ADDRESSES INDICATING SUBSCRIBER LINES TO BE CONNECTED WITH EACH OTHER, AND HAVING AN ADDRESS REGISTER FOR SUCCESSIVELY PERIODICALLY PULSE-WISE READING INDIVIDUAL SUBSCRIBER LINES AS TO THEIR CONDITION OF OPERATION, SAID ADDRESS REGISTER SUPPLYING IN CYCLIC SEQUENCE THE ADDRESS OF A SUBSCRIBER LINE WHICH HAS JUST BEEN READ UNTIL TERMINATION OF THE SWITCHING OPERATIONS WHICH ARE TO BE CARRIED OUT FOR THE RESPECTIVE SUBCRIBER LINE, BASED UPON ITS CONDITION OF OPERATION, COMPRISING MEANS, EFFECTIVE UPON THE COMPARISON OF THE SUBSCRIBER ADDRESS JUST SUPPLIED BY THE ADDRESS REGISTER WITH ADDRESSES OF SUBSCRIBERS PARTICIPATING IN CONNECTIONS WHICH ARE RECORDED IN AN ADDRESS STORER, FOR COUNTING THE CASES OF THE OCCURRENCE OF IDENTITY OF ADDRESS AND FOR GIVING OFF A SIGNAL, IN CASE OF AT LEAST TWO OCCURRENCES OF IDENTITY OF ADDRESS, SAID SIGNAL INDICATING A DOUBLE CONNECTION, AND MEANS CONTROLLED BY SAID SIGNAL FOR GIVING-OFF A COMMAND FOR THE RELEASE OF THOSE CONNECTIONS IN WHICH THE SUBSCRIBER HAVING THE ADDRESS JUST SUPPLIED BY THE ADDRESS REGISTER IS PARTICIPATING.