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Crossbar switch
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In electronics and telecommunications, a crossbar switch is a collection of switches arranged in a matrix configuration. A crossbar switch has multiple input and output lines that form a crossed patte
Crossbar telephone exchange of 1903 for four subscribers (vertical bars), having four cross-bar talking circuits (horizontal bars), and one bar to connect the operator (T). The lowest cross-bar connects idle stations to ground to enable the signaling indicators (F). The switch is operated manually with metal pins that create a connection between the horizontally and vertically arranged bars.
Crossbar telephone exchange of 1903 for four subscribers (vertical bars), having four cross-bar talking circuits (horizontal bars), and one bar to con
Western Electric 100-point six-wire Type B crossbar switch
Western Electric 100-point six-wire Type B crossbar switch
Late-model Western Electric crossbar switch
Late-model Western Electric crossbar switch
Back of Type C
Back of Type C
Rotary system
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The rotary machine switching system, or most commonly known as the rotary system, was a type of automatic telephone exchange manufactured and used primarily in Europe from the 1910s. The system was de
Crossbar switch
…the same switching topology in solid-state electronics. The crossbar switch is one of the principal telephone exchange architectures, together with a rotary switch, memory switch, and a crossover switch. A crossbar switch is an assembly of individual switches between a set of inputs and a set of outputs. The…
Western Electric friction drive Line Finder (No. 7001 type)
Western Electric friction drive Line Finder (No. 7001 type)
An example of a Western Electric 7A Rotary (Bird-cage) Line Finder assembly. The horizontal shaft is driven by a gear and when the Line Finder's elect
An example of a Western Electric 7A Rotary (Bird-cage) Line Finder assembly. The horizontal shaft is driven by a gear and when the Line Finder's electromagnet is energized, a flexible disc at the base of the Line Finder's brush carriage is engaged through friction to the horizontal shaft's driving disc, causing the brush carriage to rotate.