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Telephone exchange names often provide a historical, memorable, and even nostalgic context, personal connection, or identity to a community. They can therefore often be found in popular culture, such as music, art, and prose. An old 2L-5N format appears in the song title "PEnnsylvania 6-5000" (phone number PE 6-5000), recorded by Glenn Miller.
Exchange names were usually closely tied to the physical location of telephone exchanges, being either the name of a city, town or village or district. The length of early telephone numbers depended on the number of subscribers attached to a particular exchange: if there were fewer than 10 subscribers, a single digit sufficed.
A telephone exchange, telephone switch, or central office is a central component of a telecommunications system in the public switched telephone network (PSTN) or in large enterprises. It facilitates the establishment of communication circuits, enabling telephone calls between subscribers.
Telephones on automatic exchanges had letters as well as numbers marked on the telephone dial, and calls to London numbers used the first three letters of the exchange name followed by four digits, e.g. EUS 1234. [2] The number could be dialled as 387-1234 or spoken to a manual exchange operator as Euston 1234.
Spokeo examined historical documents, news reports, and other sources to chronicle the fascinating history of the American phone book. ... The world's first telephone exchange took place on Jan ...
All-number calling was a telephone numbering plan introduced in 1958, [35] that converted telephone numbers with exchange names to a numeric representation of seven digits. The original plan of 1947 had been projected to be usable beyond the year 2000. However, by the late 1950s it became apparent that it would be outgrown by about 1975. [36]
Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of which the leading three are the area code.
In a Director area there were 8 digits available for the A-digit letter of the exchange name (excluding ‘1’ and ‘0’), and 9 digits each for the B-digit and C-digit letters; hence there were a maximum of 648 exchange names (8 × 9 × 9), though in practice some ABC codes (e.g. 555) did not have a usable name equivalent, and by 1966 ...