Business telephone system
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A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system to the private branch exchange.
Early-1970s Telephone Exchange model TESLA Automatic system
Early model 464G Western Electric key telephone set
A 1930s key telephone for a private branch exchange
Nortel T Series Key System Telephone
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
Business telephone system
…the development of large-scale integrated circuits, key systems typically consisted of electromechanical components, such as relays, as were larger telephone switching systems. The systems marketed in North America as the 1A, 1A1, 1A2 Key System, and the 6A, are typical examples and were sold for many decades. The…
A telephone operator manually connecting calls with cord pairs at a telephone switchboard
A modern central office, equipped with voice communication and broadband data capabilities
Tivadar Puskás
1922 diagram of 1877 Boston exchange