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PBX switchboard, 1975. 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 telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.
An electric switchboard is a piece of equipment that distributes electric power from one or more sources of supply to several smaller load circuits. It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the switchboard.
Switchboard technology was a physically demanding task, involving numerous plugs, keys, lights, connecting cords, and complicated protocols for establishing connections. The full-time operators were on duty 56 hours per week, and while they often grumbled about being overworked by a harsh boss, they were reasonably compensated at $50 a month.
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 telephone exchange , telephone switch , or central office is a central component of a telecommunications system in the public switched telephone network (PSTN) or ...
Kellogg company logo as used from the 1920s to the 1950s. The Kellogg Switchboard and Supply Company was an American manufacturer of telecommunication equipment. Anticipating the expiration of the earliest, fundamental Bell System patents, Milo G. Kellogg, an electrical engineer, founded the company in 1897 in Chicago to produce telephone exchange equipment and telephone apparatus.
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Panel switch district selector frame at the Connections Museum in Seattle. The Panel Machine Switching System is a type of automatic telephone exchange for urban service that was used in the Bell System in the United States for seven decades.
eLearning Suite 2 was released in May 2010 containing Captivate 5, Flash Professional CS5, Dreamweaver CS5, Presenter 7 (only for the windows version), Acrobat 9 Pro, Photoshop CS5 Extended, and Soundbooth CS5. [3] eLearning Suite 2 was the first versions to be available for both Microsoft Windows and Apple Mac OS X platforms. Version 1 had ...