WikiVisually
Infinite photos and videos for every Wiki article · Find something interesting to watch in seconds
Wars and Battles World Banknotes Celebrities Richest US Counties Orders and Medals Rare Coins Animals Tallest Buildings Countries of the World British Monarchs Sports Supercars Great Cities Largest Palaces Presidents Recovered Treasures History by Country Largest Empires Kings of France Famous Castles Wonders of Nature Best Campuses Crown Jewels Great Museums Great Artists Ancient Marvels
more top lists
History
Original North American area codes
Videos
Photos
The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators. Expanding this technology for national use required a comprehensive and universal, continent-wide telephone numbering plan.
Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central o
Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
Telephone exchange
Videos
Photos
A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN) or large enterprise telecommunications systems. It facilitates the interconnection of telephone subscriber lines or digital system virtual circuits, enabling telephone calls between subscribers.
A telephone operator manually connecting calls with cord pairs at a telephone switchboard
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
A modern central office, equipped with voice communication and broadband data capabilities
Tivadar Puskás
Tivadar Puskás
1922 diagram of 1877 Boston exchange
1922 diagram of 1877 Boston exchange