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1924 PBX switchboard. With manual service, the customer lifts the receiver off-hook and asks the operator to connect the call to a requested number. Provided that the number is in the same central office, and located on the operator's switchboard, the operator connects the call by plugging the ringing cord into the jack corresponding to the ...
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.
NEAX31 (Discrete Electronic CPU, 4-stage Crossbar switching fabric, PBX) NEAX12 (Analog / Digital Hybrid PBX) NEAX22 (Analog / Digital hybrid PBX) NEAX 2000/1000; NEAX2400 (Fully Digital PBX) XN120; NEC Univerge SL1000 (Small or Medium Sized, VoIP And TDM) Enterprise IP Systems NEC Univerge SV7000 (Fully IP, VoIP and TDM) Pure IP Communication ...
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.
Stromberg-Carlson produced several unique switching systems, including: XY, a "flat motion" switch logically similar to Strowger switching.The "XY Selector" was not invented by SC, but licensed from L.M. Ericsson of Sweden in the late 1940s and re-engineered for U.S. switching applications (Ericsson used it for PABX and a very small Rural Exchange application).
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.
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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.