cellular telephone

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cellular telephone

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

cellular telephone or cellular radio, telecommunications system in which a portable or mobile radio transmitter and receiver, or "telephone," is linked via microwave radio frequencies to base transmitter and receiver stations that connect the user to a conventional telephone network. The geographic region served by a cellular system is subdivided into areas called cells. Each cell has a central base station and two sets of assigned transmission frequencies; one set is used by the base station, and the other by mobile telephones. To prevent radio interference, each cell uses frequencies different from those used by its surrounding cells, but cells sufficiently distant from each other can use the same frequencies. When a mobile telephone leaves one cell and enters another, the telephone call is transferred from one base station and set of transmission frequencies to the next using a computerized switching system. The first cellular telephone system began operation in Tokyo in 1979, and the first U.S. system began operation in 1983 in Chicago. A camera phone is a cellular phone that also has picture taking capabilities. Some camera phones have the capability to send these photos to another cellular phone or computer. Advances in digital technology and microelectronics has led to the inclusion of unrelated applications in cellular telephones, such as alarm clocks, calculators, Internet browsers, and voice memos for recording short verbal reminders, while at the same time making such telephones vulnerable to certain software viruses. In many countries with inadequate wire-based telephone networks, cellular telephone systems have provided a means of more quickly establishing a national telecommunications network.

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cellular

The Oxford Pocket Dictionary of Current English | 2009 | © The Oxford Pocket Dictionary of Current English 2009, originally published by Oxford University Press 2009. (Hide copyright information) Copyright

cel·lu·lar / ˈselyələr/ • adj. 1. of, relating to, or consisting of living cells: cellular proliferation. 2. denoting or relating to a mobile telephone system that uses a number of short-range radio stations to cover the area that it serves, the signal being automatically switched from one station to another as the user travels about. 3. consisting of small compartments or rooms: cellular accommodations. DERIVATIVES: cel·lu·lar·i·ty / ˌselyəˈlaritē/ n.

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Telephone

The Oxford Companion to United States History | 2001 | | © The Oxford Companion to United States History 2001, originally published by Oxford University Press 2001. (Hide copyright information) Copyright

Telephone. In 1876, Alexander Graham Bell devised the technology for the electronic communication of the human voice between two points—a technology involving variations in an electric current responding to the sound waves created by human speech.By 1878, a “switchboard” permitted any telephone user to reach any other user in the same network. Further advances in the nineteenth century extended the effective distance of the telephone to hundreds of miles, reduced electrical interference, simplified the instrument, and expanded the number of telephones that could be connected through one exchange. Early twentieth‐century innovations permitted cross‐country and global calls, direct customer dialing unassisted by switchboard operators, and a system that allowed many calls to occupy the same wire simultaneously. Later developments liberated long‐distance calls from wires, first by microwave transmission and then by satellite communication. Wireless local calling became common near the end of the twentieth century with cellular telephone systems.

Telephone production and service in the United States, unlike elsewhere, remained in the hands of private companies but under government regulation. Bell and his associates formed the ancestral company of American Telephone and Telegraph (AT&T) immediately after the invention of the telephone. By 1880, AT&T had established a patent‐based monopoly. Its Western Electric subsidiary had exclusive rights to manufacture telephones, which AT&T then leased to customers. Only its local subsidiaries could provide telephone service, an expensive luxury used largely by urban businessmen.

In 1893, when AT&T's patents expired, there were four telephones per thousand Americans, with two‐thirds of those in businesses. Shortly afterward, thousands of new enterprises, including small cooperatives, formed to provide local telephone service. Prices dropped sharply and telephone subscription expanded rapidly, particularly in rural areas. By 1907, homes with telephones had multiplied about tenfold, but AT&T now served fewer than half the nation's three million customers. Acquired by the financier J.P. Morgan in 1907, AT&T bought or bankrupted many competitors. To fend off federal antitrust action, the corporation agreed in 1913 to cease aggressive takeovers and to interconnect its lines with those of competitors. Ultimately, a national system emerged, consisting of a dominant AT&T controlling all long‐distance service and most local service; many small “independents” providing local service in isolated places; and regulatory agencies, state and federal, charged with keeping telephone rates affordable.

In 1984, new antitrust challenges led a federal court to divide AT&T into separate regional companies. It also introduced competition to telephone manufacturing and long‐distance service. Deregulation brought expanded telephone services and reduced the costs of long‐distance calling; basic telephone service, however, now less subsidized, increased in cost.

Telephone companies initially promoted their service as an aid to commerce. Phoning saved trips, sped up transactions, and linked field representatives to central offices. Early telephone marketers paid less attention to home subscribers. In 1900, fewer than 10 percent of American families had telephones, but lower prices had raised that figure to almost 40 percent by 1930. The rate of household‐telephone subscription dropped during the depression of the 1930s but then rebounded to almost 80 percent in 1960 and 94 percent in 1994.

Some commentators have speculated that the telephone may have changed how Americans think and act. However, the best evidence is that the telephone enabled Americans to pursue their characteristic ways of life more efficiently.
See also Antitrust Legislation; Business; Economic Regulation; Gilded Age; Internet and World Wide Web; Telegraph.

Bibliography

John Brooks , Telephone: The First Hundred Years, 1976.
Claude S. Fischer , America Calling: A Social History of the Telephone to 1940, 1992.

Claude S. Fischer

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Paul S. Boyer. "Telephone." The Oxford Companion to United States History. Oxford University Press. 2001. Encyclopedia.com. 12 Nov. 2009 <http://www.encyclopedia.com>.

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Paul S. Boyer. "Telephone." The Oxford Companion to United States History. Oxford University Press. 2001. Retrieved November 12, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O119-Telephone.html

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Free newspaper and magazine articles

Free Article Cellular telephones; irrigation fluid; insufflation filters; sterilization condensate; counts; head covers.(Statistical Data Included)
Magazine article from: AORN Journal; 7/1/2000
Free Article Simulated driving performance is worse with a passenger than a simulated cellular telephone converser.
Magazine article from: North American Journal of Psychology; 6/1/2008
Free Article Cellular Telephones and Brain Cancer: Current Research.
Magazine article from: Environmental Health Perspectives; 5/1/2001

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