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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 (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.
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.
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.)
[citation needed] It was a tandem switch that connected three Strowger exchanges. The first commercial roll-out of a fully digital local switching system was Alcatel's E10 system which began serving customers in Brittany in Northwestern France in 1972. [citation needed] Prominent examples of digital switches include:
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 ...
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Slightly more complicated was the two axis stepping switch, (also called Strowger switch or two motion selector in Britain). Typically, a single compact group of wipers could connect to one of 100 (or 200) different fixed contacts, in ten levels. When the switch was idle, the wipers were disengaged from the fixed contacts.