Arrangements for automatically identifying calling numbers and class of service of calling lines

Claim 1

IN A TELEPHONE EXCHANGE, AN ARRANGEMENT FOR AUTOMATICALLY IDENTIFYING CALLING NUMBERS PERTAINING TO LINES CONNECTED TO THE EXCHANGE, SAID ARRANGEMENT COMPRISING IN COMBINATION: (A) INPUT CONDUCTORS EACH INDIVIDUAL TO A LINE CONNECTED TO THE EXCHANGE, (B) THOUSANDS-DIGIT AND HUNDREDS-DIGIT AND TENS-DIGIT AND UNITS-DIGIT DECIMALD OUTPUT CONDUCTORS, (C) TWO GROUPS OF CONDUCTORS COMPRISING A GROUP OF THOUSANDS-HUNDREDS CONDUCTORS AND A GROUP OF TENSUNITS CONDUCTORS AND CONSTITUTING ONE CROSS-POINT FOR AND CORRESPONDING TO EACH OF A PLURALITY OF FOUR-DIGIT DECIMAL NUMBERS CONSTITUTING THE NUMBERS THE ARRANGEMENT IS CAPABLE OF IDENTIFYING, (D) FOR AN INDIVIDUAL TO EACH OF SAID CROSS-POINTS, A CROSS-CROSS CIRCUIT COMPRISING A PAIR OF COUPLING GASFILLED DIODES AND AT LEAST TWO COUPLING RESISTORS AND SERVING TO COUPLE AN INPUT CONDUCTOR, INDIVIDUAL TO A LINE TO WHICH THE PARTICULAR FOUR-DIGIT DECIMAL NUMBER CORRESPONDING TO THE CROSS-POINT PERTAINS, TO THE PARTICULAR THOUSANDS-HUNDREDS CONDUCTOR AND TENSUNITS CONDUCTOR FORMING THE CROSS-POINT, THE COUPLING OF SAID INPUT CONDUCTOR TO ONE OF THESE TWO CONDUCTORS FORMING THE CROSS-POINT BEING BY WAY OF ONE DIODE OF THE PAIR OF COUPLING GAS FILLED DIODES IN SERIES WITH AT LEAST ONE COUPLING RESISTOR AND THE COUPLING OF SAID INPUT CONDUCTOR TO THE OTHER OF THESE TWO CONDUCTORS FORMING THE CROSS-POINT BEING BY WAY OF THE OTHER DIODE OF THE PAIR IN SERIES WITH AT LEAST ONE COUPLING RESISTOR, (E) FOR AN INDIVIDUAL TO EACH THOUSANDS-HUNDREDS CONDUCTOR, TO ISOLATING RECTIFIERS OVER RESPECTIVE ONES OF WHICH THE CONDUCTOR IS COUPLED TO A CORRESPONDING THOUSANDS-DIGIT DECIMAL OUTPUT CONDUCTOR AND TO A CORRESPONDING HUNDREDS-DIGIT DECIMAL OUTPUT CONDUCTOR, AND, FOR AND INDIVIDUAL TO EACH TENS-UNITS CONDUCTORS, TWO ISOLATING RECTIFIERS OVER RESPECTIVE ONES OF WHICH THE CONDUCTOR IS COUPLED TO A CORRESPONDING TENS-DIGIT DECIMAL OUTPUT CONDUCTOR AND TO A CORRESPONDING UNITS-DIGIT DECIMAL OUTPUT CONDUCTOR, ALL SUCH ISOLATING RECTIFIERS OF THE ARRANGEMENT BEING CONNECTED IN SUCH SENSE THAT AN ELECTRICAL MARKETING CONDITION APPLIED, FOR EFFECTING IDENTIFICATION OF THE CALLING NUMBER IN RESPECT OF A CALL, TO THE PARTICULAR INPUT CONDUCTOR RELEVANT TO THE CALL, BY CAUSING EACH COUPLING GAS-FILLED DIODE OF THE APPROPRIATE CROSS-POINT CIRCUIT TO CONDUCT IN SERIES WITH AT LEAST ONE COUPLING RESISTOR OF THIS CROSS-POINT CIRCUIT, PRODUCES CURRENT FLOW IN THE LOW-RESISTANCE DIRECTION THROUGH EACH OF THE FOUR SAID ISOLATING RECTIFIERS PERTAINING TO THE PARTICULAR THOUSANDS-HUNDREDS CONDUCTOR AND TENS-UNITS CONDUCTOR FORMING THE CROSS-POINT CONCERNED, CAUSING AN OUTPUT ELECTRICAL MARKETING CONDITION TO APPEAR UPON EACH OF THE RELEVANT FOUR DECIMAL OUTPUT CONDUCTORS, AND