. The Bell System technical journal . inating and terminating equipments and with improvedfeatures over the coordinate system which it resembled in many circuits, second trials and trouble indicators which hadproven highly successful in the decoder type panel system were importantfeatures of No. 1 crossbar. Automatic alternate routing and the abilityto operate with non-consecutive PBX assignments were major newfeatures introduced in this system for the first time. The subsequently developed No. 5 crossbar system included a numberof improvements, the chief of which from a
. The Bell System technical journal . inating and terminating equipments and with improvedfeatures over the coordinate system which it resembled in many circuits, second trials and trouble indicators which hadproven highly successful in the decoder type panel system were importantfeatures of No. 1 crossbar. Automatic alternate routing and the abilityto operate with non-consecutive PBX assignments were major newfeatures introduced in this system for the first time. The subsequently developed No. 5 crossbar system included a numberof improvements, the chief of which from a common-control standpointwas the use of common markers for originating and terminating businessand the use of the call back feature in setting up the connection. In thissystem the common equipment records the calling line identification aswell as the called number, and after setting up to the called line oroutgoing trunk, breaks down the connection to the common equipment ORIGINATING EQUIPMENT I TERMINATING EQUIPMENT CALLEDTELEPHONE. DISTRICTJUNCTOR rv PRI SECLINE LINK FRAME(used FOR BOTH originating and terminating calls)
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
