Gsm Iden
Gsm Iden
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Cell Phone (cell phone) is a wireless, long range phones, voice mail, which during travel can change the way transparent antenna connectors, radio reception cell to another radio reception without abandoning or losing the ongoing call.
Besides its function as a standard voice phone, latest mobile phones (cell phones) have features such as SMS for text messaging, MMS multimedia messaging, radio, games, Internet access for email, browsing, blogs, music (MP3) the playback, memo recording, built-in camera Digital cameras and camcorders, ringtones, personal organizers, Push to Talk (PTT), infrared and Bluetooth connectivity, call logs, video streaming, call, video video, and also serve as a wireless modem for computers that can connect to the Internet.
Power in a mobile phone (cell phone) is obtained by rechargeable batteries, which can be reloaded from the network, a USB port or cigarette lighter of a car. Nickel Metal Hydride were the most common types batteries, which, thanks to the "memory effect" (the user can recharge only when the entire drum tracks) have been replaced by lithium-ion batteries which do not suffer from memory effect.
Cellular phones (cell phone) was due to the existence the invention of hexagonal cells in 1947, the base stations by Bell Labs engineers at AT & T. This has been developed over the years 1960 by Bell Labs. During a call, the channel frequency could not be changed automatically from one cell (base station coverage area) to another cell (area of base station coverage) as the person who traveled from the surface of a cell to another cell area. Amos Joel of Bell Labs invented a touch and invention known as the so-called "relay" in which the frequency of the channel can be changed automatically from from one cell to another cell in the same call, the mobile user traveled from one cell to another cell. Thanks to its construction heavy, these phones are used mainly in automobiles.
The first phone in a convenient mobile environment is not the vehicle, which could be handheld, was invented by Martin Cooper, CEO (Communications Division) of Motorola, which has made the world `s first portable cellular phone (cell phone) call April 3, 1973.
The mobile phone technology (telephone cell) function depends on the mobile, but they all use electromagnetic radio waves, which are in contact with cell site (base station). The base station is composed of several antennas which are mounted on a pole, tower or building. Cell sites extend at a distance of 5 to 8 miles (approximately 8 to 13 km) from the other. The transceiver low power from the cell phone transmits voice and data to the nearest cell. During the trip, the combined "transfer" of information to the cell site. Operators mobile use many technologies to maintain the flow of digital information flowing from cell phone to cell site and vice versa.
Wireless technologies are grouped in the head, known as generations, starting from zero generation or 0g. The 4G will present generation, however, there are cell phones (cell phone) that still operate on 1G, 2G, and 3G technologies. Wireless technologies used in each generation are listed below:
0G: PTT, MTS, IMTS, AMT, Olt, BAT Autotel PALM, ARP
1G: NMT, AMPS / TAC / ETACS, HiCap, CDPD, Mobitex, DataTAC
2G: GSM, iDEN, D-AMPS, IS-95/cdmaOne, PDC, CSD, PHS, GPRS, HSCSD, expand, CDMA2000 1xRTT/IS-2000, EDGE (EGPRS)
3G: W-CDMA, UMTS (3GSM), FOMA, TD-CDMA/UMTS-TDD, 1xEV-DO/IS-856, TD-SCDMA, GAN (UMA), HSPA, HSDPA, HSUPA, HSPA +, E-UTRA
4G: UMB, UMTS Revision 8 (LTE), WiMAX
Frequency bands: SMR, Cellular, PCS
The impact of mobile (cell) use on human health has been a considerable global concern. Research studies in Copenhagen, the Danish Institute of Epidemiology Cancer, National Cancer Institute and the Institute of Cancer Research, do not set no link between cancer and cell phone use. However, an intergovernmental agency IARC (International Agency for Research on Cancer) forming part of the United Nations World Health conducted a study of 4,500 users and found a statistically significant relationship between cell phone use and frequency of tumors. Further research is happening.
Cell Phone (cell phone) usage and driving is a common phenomenon in the world whole. Some jurisdictions have banned the use of handheld phones while driving, but allowed the hands-free mode Using the phone cell phone while driving. However, studies have shown that the distraction caused by the conversation itself, so the hand and the hand phones without contributing to traffic accidents. Further studies on the use of cell phones that happen.
Nokia Corporation is currently the world `s largest manufacturer of mobile phones (cell phone). Other manufacturers of cell phones, in order listing are 3G, Audiovox (UT Starcom), Benefon, BenQ-Siemens, Fujitsu, High Tech Computer Corporation (HTC), Kyocera, LG Mobile, Motorola, NEC, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, T Sagem, Samsung, Sanyo, Sharp, Siemens, Sierra Wireless, SK Teletech, Sony Ericsson, Alcatel & A, Toshiba and Verizon.
This article is licensed under the GNU FDL and may be distributed without permission from the author. But the author's name and all URLs (links) mentioned in the article and biography must be kept.
This article can also be accessed in Portuguese language from the News Article section of page http://www.polomercantil.com.br/celular.php
Roberto Sedycias works as IT consultant for http://www.polomercantil.com.br
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