Wednesday, 21 March 2012


Wireless technology is generally used for mobile IT equipment. It encompasses cellular telephones, personal digital assistants (PDA's), and wireless networking. Other examples of wireless technology include GPS units, garage door openers or garage doors, wireless computer mice and keyboards, satellite television and cordless telephones. Wireless networking technologies range from global voice and data networks which allow users networks, to establish wireless connections across long distances, to infrared light and radio frequency technologies that are optimized for short‐range wireless connections.
  Wireless network most commonly used to refer to a telecommunications network whose interconnections between nodes is implemented without the use of wires, such as a computer network. Wireless telecommunications networks are generally implemented with some type of information transmission system that uses electromagnetic waves, such as radio waves, for the carrier. Wireless communication involves, radio frequency communication, microwave communication, for example long‐range line of sight via highly directional antennas or short line‐of‐antennas, shortrange communication, infrared (IR) short‐range communication, for example from remote controls or via IRDA. Applications may involve point‐to‐point communication, point‐to‐multipoint communication, broadcasting, cellular networks and other wireless networks.

Type of Wireless Network: WWAN networks. These connections can be maintained over large geographical areas, such as cities or countries, through the use of multiple antenna sites or satellite systems maintained by wireless service providers. 􀀹 WMAN technologies enable users to establishwireless connections between multiple locations
Type of Wireless Network : WMAN within a metropolitan area (for example, between multiple office buildings in a city or on a university campus), without the high cost of laying fiber or copper cabling and leasing lines.
Type of Wireless Network : WLAN a building and can provide the final few meters of connectivity between a wired network and the mobile user. Wireless Local Area Networks (WLAN) are implemented as an extension to wired LANs within.
Type of Wireless Network :  WLAN technologies enable users to establish wireless connections within a local area (for example, within a WLAN corporate or campus building, or in a public space, such as an airport). WLANs can be used in temporary offices or other spaces where the installation of extensive cabling would be prohibitive, or to supplement an existing LAN so that users can work at different locations within a building at different times.
Type of Wireless Network : WPAN technologies enable users to establish ad hoc, wireless communications for devices (such as PDAs, WPAN cellular phones, or laptops) that are used within a personal operating space (POS). A POS is the space surrounding a person, up to a distance of 10 meters.
  Hand‐held and other Internet‐enabled devices the majority of current Internet content is not optimized for these devices; presently, only email, stock quotes, news, messages and simple transaction oriented services are messages, transaction‐available. Other limitations include low bandwidth (less than 14 Kbps), low quality of service, high cost, the need for additional equipment, and high utilization of devices' battery power. Nevertheless, this type of wireless technology is growing rapidly with better and more interoperable products.
Infrared Data Transmission is IrDA (Infrared Data Association) is an industry standard for wireless communication with infrared light. (Non RF) Many laptops sold today are equipped with an IrDAcompatible transceiver that enables communication with other devices, such as printers, modems, LANs, or other laptops. The transfer speed ranges from 2400 bps to 4Mbps. It requires line of sight transmission.
Bluetooth is an industrial specification for wireless personal area networks (PANs).Designed for very short range <10 m, connect and exchange information between device such as mobile phones, laptops, PCs, printers, digital, cameras and video game consoles over a secure, globally unlicensed short‐range radio frequency. Wi‐Fi the underlying technology of wireless local area
Wi‐Fi the underlying technology of wireless local area networks (WLAN)  based on the IEEE 802.11 specifications and used for mobile computing devices, such as laptops. In LANs, increasingly used for more services, including Internet and VoIP phone access, gaming, and basic connectivity of consumer electronics such as televisions and DVD players, or digital cameras. 3G 3G networks are an in between standard. 3G is seen more as Pre 4G instead of a standard of its own. The advantage 3Gnetworks have over 2G networks is speed 3G networks are built to handle the needs of today’s wireless users. This standard of wireless networks increases the speed of internet browsing, picture and video messaging, and handheld GPS use. 4G (AKA Beyond 3G) is like the other generations in that its advantage lies in promised increased speeds in data transmission. There is currently no formal definition for 4G, but there are objectives. One of these objectives is for 4G to become a fully IP‐based system, much like modern computer networks. The supposed speeds for 4G will be between 100 Mbit/s and 1 Gbit/s.

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