Information AboutWireless |
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The term wireless is normally used to refer to any type of . The term wireless technology is generally used for mobile IT equipment. It encompasses Cellular Telephone s, Personal Digital Assistant s (PDAs), and Wireless Network ing. Other examples of ''wireless technology'' include GPS units, Garage Door Openers And Or Garage Doors , wireless Computer Mice and Keyboard s, Satellite Television and cordless Telephone s. INTRODUCTION Wireless operations permits services, such as long range communications, that are impossible or impractical to implement with the use of wires. The term is commonly used in the telecommunications industry to refer to telecommunications systems (e.g., radio transmitters and receivers, remote controls, computer networks, network terminals, etc.) which use some form of energy (e.g. Radio Frequency (RF), Infrared light, Laser light, visible light, acoustic energy, etc.) to transfer information without the use of wires. ATIS Committee T1A1 Performance and Signal Processing. ANS T1.523-2001, Telecom Glossary 2000 http://www.atis.org/tg2k/ Information is transferred in this manner over both short and long distances. ''Wireless communication'' may be via:
Applications may involve Point-to-point Communication , Point-to-multipoint Communication , Broadcasting , Cellular Network s and other Wireless Network s. The term "wireless" should not be confused with the term " Cordless ", which is generally used to refer to powered electrical or electronic devices that are able to operate from a portable power source (e.g., a battery pack) without any cable or ''cord'' to limit the mobility of the cordless device through a connection to the mains power supply. Some cordless devices, such as cordless telephones, are also wireless in the sense that information is transferred from the cordless telephone to the telephone's base unit via some type of wireless Communications Link . This has caused some disparity in the usage of the term "cordless", for example in Digital Enhanced Cordless Telecommunications . In the last 50 years, wireless communications industry experienced drastic changes driven by many technology innovations. HISTORY The term "wireless" came into public use to refer to a radio receiver or Transceiver (a dual purpose receiver and transmitter device), establishing its usage in the field of wireless telegraphy early on; now the term is used to describe modern wireless connections such as in cellular networks and wireless broadband Internet. It is also used in a general sense to refer to any type of operation that is implemented without the use of wires, such as "wireless remote control", "wireless energy transfer", etc. regardless of the specific technology (e.g., Radio , Infrared , Ultrasonic , etc.) that is used to accomplish the operation. Early wireless work David E. Hughes , eight years before Hertz's experiments, induced electromagnetic waves in a signalling system. Hughes transmitted Morse code by an Induction apparatus. In 1878 , Hughes's induction transmission method utilized a "clockwork transmitter" to transmit signals. In 1885 , T. A. Edison uses a vibrator magnet for induction transmission. In 1888, Edison deploys a system of signalling on the Lehigh Valley Railroad. In 1891, Edison attains the wireless patent for this method using inductance (). In the history of wireless technology, the demonstration of the theory of Electromagnetic Wave s by Heinrich Rudolf Hertz in 1888 was important. |
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