Applications of wireless technology

Applications of wireless technology
Applications of wireless technology
Security systemsWireless technology may supplement or replace hard wired implementations in security systems for homes or office buildings. The operations that are required (e.g., detecting whether a door or window is open or closed) may be implemented with the use of hard wired sensors or they may be implemented with the use of wireless sensors which are also equipped with a wireless transmitter (e.g., infrared, radio frequency, etc.) to transmit the information concerning the current state of the door or window.Television remote controlSome televisions were previously manufactured with hard wired remote controls which plugged in to a receptacle or jack in the television whereas more modern televisions use wireless (generally infrared) remote control units.Cellular telephonesPerhaps the best known example of wireless technology is the cellular telephone. These instruments use radio waves to enable the operator to make phone calls from many locations world-wide. They can be used anywhere that there is a cellular telephone site to house the equipment that is required to transmit and receive the signal that is used to transfer both voice and data to and from these instruments. (For more information see mobile phones).Wireless communicationWireless is a term used to describe telecommunications in which electromagnetic waves (rather than some form of wire) carry the signal over part or the entire communication path. Common examples of wireless equipment in use today include:• Cellular phones and pagers: provide connectivity for portable and mobile applications, both personal and business.• Global Positioning System (GPS): allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth.• Cordless computer peripherals: the cordless mouse is a common example; keyboards and printers can also be linked to a computer via wireless.• Cordless telephone sets: these are limited-range devices, not to be confused with cell phones.• Satellite television: allows viewers in almost any location to select from hundreds of channels.Wireless networking is used to meet a variety of needs. Perhaps the most common use is to connect laptop users who travel from location to location. Another common use is for mobile networks that connect via satellite. A wireless transmission method is a logical choice to network a LAN segment that must frequently change locations. The following situations justify the use of wireless technology:• To span a distance beyond the capabilities of typical cabling,• To avoid obstacles such as physical structures, EMI, or RFI,• To provide a backup communications link in case of normal network failure,• To link portable or temporary workstations,• To overcome situations where normal cabling is difficult or financially impractical, or• To remotely connect mobile users or networks
Posted by bhusal at 8:12 PM 0 comments
Friday, May 25, 2007

Wireless InternetThe wireless Internet is defined by access to the

Wirelessinternet

Ramon Magasaysay Award for 2007, has made us Nepalis proud
Ramon Magasaysay Award for 2007, has made us Nepalis proud
Mahabir Pun, the recipient of the prestigious Ramon Magasaysay Award for 2007, has made us Nepalis proud. I salute him. I also look forward to the day when there will be a thousand more Mahabir Puns who will come up with such exemplary deeds.
I had the good fortune of interacting with Pun last year when we were in a workshop making midterm review presentations on various projects funded under the World Bank assisted Poverty Alleviation Program. Pun was there to make a presentation on his wireless internet system, and I was there to make a presentation on Solar Tuki.
While talking with him at that time, it became clear that the wireless internet system and network he was setting up in the villages in Myagdi was actually against the telecom laws in Nepal at that time. The parabolic antennas and other hardware needed for the wireless internet system had entered Nepal as accompanied luggage items of Pun's numerous Nepali and foreign well-wishers and volunteers. These items could not have entered Nepal legally as Pun did not have the license to either import the wireless hardware, or install and operate the wireless internet system. Unlike in other developed countries, the frequency for operating the wireless network was neither free for use nor available in the public domain. So Pun hadHISTORY
HistoryThe 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 s to use the wireless network without proper authorisation.
Pun, the brave visionary, was so highly motivated and driven to improve the lives of his village folks in Myagdi that he worked selflessly and tirelessly to establish internet access to the villages even though he knew that he was breaking the law. He got away without being punished probably because the arm of the law enforcement agency was either too short or did not feel it worth the trouble to reach out for him in Myagdi. If Pun had waited for the "proper" procedures to be set in place and for the full cooperation of the government and its agencies, he probably would still be waiting endlessly, and the villages in Myagdi would still be as isolated from the worldwide web and the global village.
Posted by bhusal at 8:52 PM 0 comments

uch 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 workDavid 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 (U.S. Patent 465,971 ).In the history of wireless technology, the demonstration of the theory of electromagnetic waves by Heinrich Rudolf Hertz in 1888 was important.[3][4] The theory of electromagnetic waves were predicted from the research of James Clerk Maxwell and Michael Faraday. Hertz demonstrated that electromagnetic waves could be transmitted and caused to travel through space at straight lines and that they were able to be received by an experimental apparatus.[3][4] The experiments were not followed up by Hertz and the practical applications of the wireless communication and remote control technology would be implemented by Nikola Tesla.The electromagnetic spectrumLight, colors, AM and FM radio, and many popular electronic devices all work on the electromagnetic spectrum. In the US the frequencies that are available for use for communication are treated as a public resource and are regulated by the Federal Communications Commission (FCC). This determines which frequency ranges can be used for what purpose and by whom. In the absence of such control, chaos might result if, for example, airlines didn't have specific frequencies to work under and a ham radio operator was interfering with the pilot's ability to land an airplane. Wireless communication spans the spectrum from 9 kHz to 300 GHz.