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 developed and tested by AT&T's American engineering division, Western Electric, in the United States, at the same time when Western Electric was also developing the Panel switch. When AT&T selected the Panel System for large American exchanges, development and sales of the No. 7-A Machine Switching System, its formal commercial name, were transferred to Western Electric's international division in Belgium. In Europe and other continents the system was met with considerable commercial success.
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| - Sistema de conmutación Rotary (es)
- Rotary system (en)
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| - Rotary es un sistema de conmutación electromecánico y rotativo diseñado en 1915 por Western Electric bajo la dirección de F. R. McBerty. Dicho sistema emplea ejes de rotación continua: produce el desplazamiento de elementos que buscan el número de usuario que llama y seleccionan el número de usuario con el que se debe hablar. Realiza la conmutación por medio de contactos mecánicos, obteniéndose una mayor velocidad. Las razones para intentar el abandono de los sistemas Rotary fueron varias: (es)
- 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 developed and tested by AT&T's American engineering division, Western Electric, in the United States, at the same time when Western Electric was also developing the Panel switch. When AT&T selected the Panel System for large American exchanges, development and sales of the No. 7-A Machine Switching System, its formal commercial name, were transferred to Western Electric's international division in Belgium. In Europe and other continents the system was met with considerable commercial success. (en)
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| - Rotary es un sistema de conmutación electromecánico y rotativo diseñado en 1915 por Western Electric bajo la dirección de F. R. McBerty. Dicho sistema emplea ejes de rotación continua: produce el desplazamiento de elementos que buscan el número de usuario que llama y seleccionan el número de usuario con el que se debe hablar. Realiza la conmutación por medio de contactos mecánicos, obteniéndose una mayor velocidad. Las razones para intentar el abandono de los sistemas Rotary fueron varias:
* En primer lugar, la progresiva extensión y complicación de las redes telefónicas, con la automatización de las conexiones interurbanas, hacía excesivamente altos los tiempos de establecimiento de las llamadas.
* Es necesario diseñar dispositivos con tiempos de actuación de sólo decenas de milisegundos y nuevas señalizaciones que sustituyeran a los trenes de impulsos.
* La multiplicidad de etapas introducía un "ruido" excesivo en las comunicaciones por la vibración de los contactos generada por la actuación de las máquinas. Se necesitaban selectores prácticamente estáticos que además ya podían utilizar contactos de metales preciosos, lo cual era imposible en las máquinas rotativas por el desgaste producido por el roce de las escobillas.
* Todo ello llevó a la introducción del conmutador de barras cruzadas. (es)
- 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 developed and tested by AT&T's American engineering division, Western Electric, in the United States, at the same time when Western Electric was also developing the Panel switch. When AT&T selected the Panel System for large American exchanges, development and sales of the No. 7-A Machine Switching System, its formal commercial name, were transferred to Western Electric's international division in Belgium. In Europe and other continents the system was met with considerable commercial success. The Rotary and Panel systems were very different systems, but both used the same newly developed component technology, such as Western Electric's latest relays, and the principles of the of revertive pulsing and preselection. The Rotary switches were smaller than the Panel system, and served only 200 rather than 500 stations. The initial version was the model 7A. It was succeeded by 7A1 and 7A2 and a rural system had the designation 7D. (en)
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