Documentary Film ❥ Process of Electronic Switching System ~ Technology 2016

https://www.youtube.com/watch?v=k8H04osBjHY

The generations of telephone switches before the advent of electronic switching in the 1950s used purely electro-mechanical relay systems and analog voice paths. These early machines typically utilized the step-by-step technique. The first generation of electronic switching systems in the 1960s were not entirely digital in nature, but used reed relay-operated metallic paths or crossbar switches operated by stored program control (SPC) systems.
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