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source(google.com.pk)Today's communications industry would not be what it is without the contributions made by Richard H. Frenkiel and Joel S. Engel. The big breakthrough came when AT&T Labs researchers Frenkiel and Engel divided wireless communications into a series of cells, then automatically switched callers as they moved so that each cell could be reused. This led to the development of cellular phones and made today’s mobile communications possible.
Invention: mobile telephone Function: noun / mo•bile tele•phone Definition: A mobile radiotelephone, often in an automobile, that uses a network of short-range transmitters located in overlapping cells throughout a region, with a central station making connections to regular telephone lines. Also called cellular telephone Inventor: Joel Engel and Richard Frenkiel
Criteria: First practical cellular telephone system.
Birth: Richard Frenkiel, March 4, 1943 in Brooklyn, New York Joel Engel, February 4, 1936 in New York City Nationality: American Milestones: 1921 The Detroit Police Department, began experimentation with one-way vehicular mobile service.
1928 Detroit Police commenced regular one-way radio communication with all its patrol cars.
1933 Bayonne, NJ Police Department initiated regular two-way communications with its patrol ars1936 Alton Dickieson, H.I. Romnes and D. Mitchell begin design of AT&T's mobile phone system1940 Connecticut State Police began statewide two-way, on the frequency modulated (FM) 1941 FM mobile radio became standard throughout the country following the success in Connecticut1946 A driver in St. Louis, Mo., placed a phone call,it was the first AT&T mobile telephone call.
1948 wireless telephone service was available in almost 100 cities and highway corridors. 1947 cellular telephone service conceived by D.H. Ring at Bell Labs, but the technology didn't exist 1971 Richard Frenkiel and Joel Engel of AT&T applied computers and electronics to make it work. 1973 Martin Cooper of Motorola made the first cellphone call to his rival Joe Engel of AT&T Bell Labs1978 AT&T conducted FCC-authorized field trials in Chicago and Newark, N.J.
1979 the first cellular network was launched in Japan. 1982 FCC granted commercial licenses to an AT&T subsidiary, Advanced Mobile Phone Service1983 AMPS was then divided among the local companies as part of the planning for divestiture1983 Illinois Bell opened the first commercial cellular system in OctoberCAPs: Joel Engel, Richard Frenkiel, Alton Dickieson, H.I. Romnes, D. Mitchell, D.H. Ring, William (Bill) C. Jakes, Martin Cooper, ARY, mobile phone, mobile telephone, cell phone, cellular phone, cellphone, wireless phone, SIP, history, biography, inventor, invention.
Today's communications industry would not be what it is without the contributions made by Richard H. Frenkiel and Joel S. Engel. The big breakthrough came when AT&T Labs researchers Frenkiel and Engel divided wireless communications into a series of cells, then automatically switched callers as they moved so that each cell could be reused. This led to the development of cellular phones and made today’s mobile communications possible.
On June 17, 1946 a driver in St. Louis, Missouri., pulled out a handset from under his car's dashboard, placed a phone call and made history. It was the first mobile telephone call. A team including Alton Dickieson, H.I. Romnesand D. Mitchell from Bell Labs, worked more than a decade to achieve this feat. By 1948, wireless telephone service was available in almost 100 cities and highway corridors. Customers included utilities, truck fleet operators and reporters. However, with only 5,000 customers making 30,000 weekly calls, the service was far from commonplace.
That "primitive" wireless network could not handle large call volumes. A single transmitter on a central tower provided a handful of channels for an entire metropolitan area. Between one and eight receiver towers handled the call return signals. At most, three subscribers could make calls at one time in any city. It was, in effect, a massive party line, where subscribers would have to listen first for someone else on the line before making a call.
Expensive and far from "mobile", the service cost $15 per month, plus 30 to 40 cents per local call, and the equipment weighed 80 pounds. Just as they would use a CB microphone, users depressed a button on the handset to talk and released it to listen.
Improved technology after 1965 brought a few more channels, customer dialing and eliminated the cumbersome handset. But capacity remained so limited that Bell System officials rationed the service to 40,000 subscribers guided by agreements with state regulatory agencies. For example, 2,000 subscribers in New York City shared just 12 channels, and typically waited 30 minutes to place a call. It was wireless, but with "strings" attached. Something better — cellular telephone service — had been conceived in 1947 by D.H. Ring at Bell Labs, but the idea was not ready for prime time. The system comprised multiple low-power transmitters spread throughout a city in a hexagonal grid, with automatic call handoff from one hexagon to another and reuse of frequencies within a city. The technology to implement it didn't exist, and the frequencies needed were not available. The cellular concept lay barron until the 1960s, when Richard Frenkiel and Joel Engel of Bell Labs applied computers and electronics to make it work. AT&T turned their work into a proposal to the Federal Communications Commission (FCC) in December 1971. After years of hearings, the FCC approved the overall concept, but licensed two competing systems in each city.
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Mobile Wallpapers Latest Mobile Wallpapers Hd 240x320 Love Free Download Animated Hd For Samsung Quotes Friendship Quotess Flowers
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Mobile Wallpapers Latest Mobile Wallpapers Hd 240x320 Love Free Download Animated Hd For Samsung Quotes Friendship Quotess Flowers
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