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A cordless telephone or portable telephone has a portable telephone handset that connects by radio to a base station connected to the public telephone network. The operational range is limited, usually to the same building or within some short distance from the base station. A cordless telephone differs functionally from a mobile telephone in ...
The Bell System Practices ( BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. [1] Covering everything from accounting and human resources procedures through ...
AT&T Merlin. AT&T Merlin is a corporate telephone system by American Telephone and Telegraph (AT&T) that was introduced in late 1983, when it was branded American Bell Merlin. After the breakup of AT&T in 1984, it was rebranded and later also supplied by Lucent and Avaya . The system was designed at the beginning of the 1980s prior to the Bell ...
Zinc–carbon batteries have a lower per unit cost and are often used as power for appliances that consume little energy, like remote controls for television, clocks, and smoke detectors. Zinc-carbon batteries were in common use with hand-cranked telephone magneto phones, powering the microphone and speaker.
Specialty Ni–Cd batteries were used in cordless and wireless telephones, emergency lighting, and other applications. With a relatively low internal resistance, they can supply high surge currents. This makes them a favourable choice for remote-controlled electric model airplanes, boats, and cars, as well as cordless power tools and camera ...
3LR12 (4.5-volt), D, C, AA, AAA, AAAA (1.5-volt), A23 (12-volt), PP3 (9-volt), CR2032 (3-volt), and LR44 (1.5-volt) batteries. This is a list of the sizes, shapes, and general characteristics of some common primary and secondary battery types in household, automotive and light industrial use. The complete nomenclature for a battery specifies ...
One of the jobs of outside plant personnel was to visit each telephone periodically to inspect the battery. During the 20th century, the "common battery" operation came to dominate, and was powered by the "talk battery" from the telephone exchange over the same wires that carried the voice signals. Late in the century, wireless handsets brought ...
Laws applied. Sherman Antitrust Act. United States v. AT&T, 552 F.Supp. 131 (1982), was a ruling of the United States District Court for the District of Columbia, [ 1] that led to the 1984 Bell System divestiture, and the breakup of the old AT&T natural monopoly into seven regional Bell operating companies and a much smaller new version of AT&T.
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