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A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [ 1 ] for both routine and emergency communication on ships to allow communication between key ...
The first field telephones had a battery to power the voice transmission, a hand-cranked generator to signal another field telephone or a manually-operated telephone exchange, and an electromagnetic ringer which sounded when current from a remote generator arrived. This technology was used from the 1910s to the 1980s.
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).
12 November 1877: The first commercial telephone company enters telephone business in Friedrichsberg close to Berlin [26] using the Siemens pipe as ringer and telephone devices built by Siemens. 1877: The first experimental Telephone Exchange is established in Boston. 1877: First long-distance telephone line
The W48 is the successor of the pre-war Modell 36 and the W38, with only a few modifications.The principle design features were based on the "classic" W28, the first widely distributed desktop telephone developed by the Siemens & Halske company and built in license for the German Reichspost from 1928 by several manufacturers.
Hicom 300 is a telephone exchange system from Siemens, originally sold in the US as the ROLM 9751-9006i, and is used by big companies such as UBS, Swisscom, Nestlé and Tamco. The Hicom system has been surpassed by the HiPath 4000 system (since 2013 Unify OpenScape 4000) (which is in turn being surpassed by Siemens's VoIP offerings).
EWSD telephone exchanges; SPX 2000 small digital telephone exchange (rural) ... (For Electrical Power Generation Control) Siemens PCS7 (process control system) for ...
Xelibri 1 was a phone announced on January 27, 2003 and weighed 65 grams. It was described as a "Retro-Futuristic Classic" in the press release with its launch and was offered in two colors: Smoke and Champagne. The Xelibri 1 cost €199 and was described as "easy on the eye and smooth on the edges" by Siemens.