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
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Friday, May 25, 2007

Wireless InternetThe wireless Internet is defined by access to the