Telephone traffic concentrator

Claim 1

A CROSSBAR SWITCH ELECTRONICALLY CONTROLLED CONCENTRATOR FOR CONNECTING A NUMBER OF SUBSCRIBERS'' LINES TO A CENTRAL TELEPHONE STATION VIA TRUCKS WHICH ARE FEWER IN NUMBER THAN THE NUMBER OF SUBSCRIBERS'' LINES SERVED BY SAID CONCENTRATOR COMPRISING IN COMBINATION A CODE TRANSMITTER AND A CODE RECEIVER WHICH ARE RESPECTIVELY ADAPTED FOR TRANSMITTING TO SAID CENTRAL STATION AND RECEIVING FROM SAID CENTRAL STATION SUBSCRIBERS'' LINE AND TRUNK ADDRESSES FORMED BY A NUMBER OF BINARY DIGITS EXPRESSED IN AN ERROR DETECTING CODE, AND ELECTRONIC SUBSCRIBERS'' LINE ADDRESS REGISTER AND AN ELECTRONIC TRUNK ADDRESS REGISTER BOTH FORMED BY A NUMBER OF BINARY STORAGE CIRCUIT, ADDRESS TRANSFER MEANS BETWEEN SAID REGISTERS AND SAID CODE TRANSMITTER AND RECEIVER, A SET OF FIRST RELAYS CORRESPONDING ONE BY ONE TO SAID STORAGE CIRCUITS, ADDRESS TRANSFER MEANS BETWEEN SAID SUBSCRIBERS'' LINE ADDRESS AND TRUNK ADDRESS REGISTERS AND SAID FIRST RELAYS, A TWO-STAGE CROSSBAR SWITCHING NETWORK HAVING ROW SELECT ELECTROMAGNETS AND COLUMNS HOLD ELECTROMAGNETS, SAID SUBSCRIBERS'' LINES AND TRUNKS BEING CONNECTED THROUGH SAID NETWORK BY FIRST ACTUATING IN SAID FIRST STAGE A ROW SELECT ELECTRO- P MAGNET AND A COLUMN HOLD ELECTROMAGNET CORRESPONDING TO THE ADDRESS OF THE SUBSCRIBER''S LINE TO BE CONNECTED TO A TRUNK AND SECONDLY ACTUATING IN SAID SECOND STAGE A ROW SELECT ELECTROMAGNET AND A COLUMN HOLD ELECTROMAGNET CORRESPONDING TO THE ADDRES OF THE TRUNK TO BE CONNECTED WITH A SUBSCRIBER''S LINE, A SET OF SECOND CONTROL RELAYS CONTROLLING SAID SELECT AND HOLD ELECTROMAGNETS, MEANS FOR CHECKING THE SUBSCRIBER''S LINE ADDRESS AND THE TRUNK ADDRESS TRANSFERRED IN SAID FIRST RELAYS ACCORDING TO THE ERROR DETECTING CODE, AND MEANS CONTROLLED BY SAID CHECKING MEANS FOR SELECTIVELY ENERGIZING THE SECOND CONTROL RELAYS CORRESPONDING TO A SUBSCRIBER''S LINE AND TO A TRUNK ACCORDING TO THE RESPECTIVE ADDRESSES THEREOF STORED IN SAID FIRST RELAYS.