Telephone switchboard
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A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telep
PBX switchboard, 1975
Telephone operator, c. 1900
A large Bell System international switchboard in 1943
U.S. Air Force operator works a switchboard in the underground command post at Strategic Air Command headquarters, Offutt Air Force Base, Nebraska in 1967.
Telephone exchange
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A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network or in large enterprises. It facilitates the est
Telephone switchboard
…connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections. The switchboard saw the peak of its use…
A modern central office, equipped with voice communication and broadband data capabilities
Tivadar Puskás
1922 diagram of 1877 Boston exchange