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The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics, it is also known as a step-by-step (SXS) switch.
Almon Brown Strowger (/ ˈ s t r oʊ dʒ ər /; February 11, 1839 – May 26, 1902) was an American inventor who gave his name to the Strowger switch, an electromechanical telephone exchange technology that his invention and patent inspired.
Strowger Automatic Toll Ticketing (SATT); relay and type 45 rotary switch mechanics Strowger Step-by-Step (Strowger patents were exclusively licensed to the Automatic Electric Company). TSPS (Traffic Service Position System, obsolete system for operator handled LD calls.)
The Strowger-Hudd system of Alfred Ernest Hudd (c. 1883 – 1958) used a pair of magnets, one a permanent magnet and one an electro-magnet, acting in sequence as the train passed over them. Hudd patented his invention and offered it for development to the Automatic Telephone Manufacturing Company of Liverpool (a subsidiary of the Strowger ...
Almon Brown Strowger was the first to file a patent for a rotary dial on December 21, 1891, which was awarded on November 29, 1892, as U.S. patent 486,909. [ 4 ] [ 5 ] The early rotary dials used lugs on a finger plate instead of holes, and did not produce a linear sequence of pulses, but interrupted two independent circuits for control of ...
The director telephone system was a development of the Strowger or step-by-step (SXS) switching system used in London and five other large cities in the UK from the 1920s to the 1980s. A large proportion (c. 70% to 80%) of telephone traffic in large metropolitan areas is outgoing traffic, and it is distributed over many exchanges.
The first Strowger switch went into operation on November 3, 1892, in LaPorte, Indiana, with 75 subscribers and capacity for 99. Independent manufacturing companies were established, such as Stromberg-Carlson in 1894 and Kellogg Switchboard & Supply Company in 1897.
Automatic switches based on the Strowger system proliferated in independent telephone companies in the 1910s and 1920s, well before the Bell System started deployment of Panel switch technology in the 1910s. In 1919, the Bell System was impacted considerably by organized operator strikes and the leadership abandoned its rejection of automatic ...