1982 "Telephone Exchange" Origins of Electronic Switching Technology (telecom; central office)

Vintage 1982: This Excellent Telephone History documentary describes the development of telephone switching technology and the evolution of the "Telephone Exchange." A British Telecom educational film. (Slightly edited from the original, run time 17 mins.)

A “TELEPHONE EXCHANGE” is a telecommunications system used to interconnect telephone subscriber lines (customers) to establish telephone calls between subscribers. An “exchange” is sometimes referred to as a “central office” or a “telephone switch.” Terminology may differ depending on where the term is used.

See British Telecom's Telecommunications History:
https://www.bt.com/about/bt/our-history/our-telecommunications-history

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Видео 1982 "Telephone Exchange" Origins of Electronic Switching Technology (telecom; central office) канала Computer History Archives Project