Number One Crossbar Switching System
The Number One Crossbar Switching System (1XB), was the primary technology for urban telephone exchanges served by the Bell System in the mid-20th century. Its switch fabric used the electromechanical crossbar switch to implement the topology of the panel switching system of the 1920s. The first No. 1 Crossbar was installed in the PResident-2 central office at Troy Avenue in Brooklyn, New York which became operational in February 1938.
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1XB1XB switch1xb switch4-1-1Class-4 telephone switchClass-5 telephone switchCrossbar switchDirect distance dialingDirector telephone systemJunctorList of telephone switchesMarker (telecommunications)Number Five Crossbar Switching SystemPanel switchPush-button telephoneSenderSwitching Control Center SystemVerizon New York
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Number One Crossbar Switching System
The Number One Crossbar Switching System (1XB), was the primary technology for urban telephone exchanges served by the Bell System in the mid-20th century. Its switch fabric used the electromechanical crossbar switch to implement the topology of the panel switching system of the 1920s. The first No. 1 Crossbar was installed in the PResident-2 central office at Troy Avenue in Brooklyn, New York which became operational in February 1938.
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The Number One Crossbar Switch ...... operational in February 1938.
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The Number One Crossbar Switch ...... operational in February 1938.
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Number One Crossbar Switching System
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