20-04-2011, 10:05 AM
Submitted By:
Naveen Kumar Gautam
[attachment=12441]
History
Back in 1991 Wi-Fi was invented by NCR Corporation/AT&T (later on Lucent & Agere Systems) in Nieuwegein, the Netherlands. Initially meant for cashier systems the first wireless products were brought on the market under the name WaveLAN with speeds of 1Mbps/2Mbps. Vic Hayes who is the inventor of Wi-Fi has been named 'father of Wi-Fi' and was with his team involved in designing standards such as IEEE 802.11b, 802.11a and 802.11g. In 2003, Vic retired from Agere Systems. Agere Systems suffered from strong competition in the market even though their products were cutting edge, as many opted for cheaper Wi-Fi solutions. Agere's 802.11abg all-in-one chipset (code named: WARP) never hit the market, Agere Systems decided to quit the Wi-Fi market in late 2004.
The technical issues surrounding WiFi are quite important. It all began in October 1999 with the introduction of the IEEE standard 802.11b protocol. This offered a 5 Mbit/s transfer speed and an effective range of 150-300 ft. Although not quite fast enough for everyone, it soon became very popular, offering clear benefits in terms of freedom over wired connections. A new standard was under development and became popular even before it was ratified in June 2003. 802.11g increased the data rate to about 22 Mbit/s, which is not exactly future proof, but more than enough for most people. The new standard was completely backward compatible, so people with the old hardware could use it with the new hardware. This made for a seamless transition.
Introduction
Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode. The name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections.
Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLAN-defined by Wi-Fi Alliance). The Wi-Fi Alliancethe organization that owns the Wi-Fi (registered trademark) term specifically defines Wi-Fi as any "wireless local area network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards."
Wi-Fi Network connect computers to each other, to the internet and to the wired network.
Wi-Fi is supported by many applications and devices including video game consoles home networks, PDAs, mobile phones major operating systems and other types of consumer electronics. Any products that are tested and approved as "Wi-Fi Certified" (a registered trademark) by the Wi-Fi Alliance are certified as interoperable with each other, even if they are from different manufacturers. For example, a user with a Wi-Fi Certified product can use any brand of access point with any other brand of client hardware that also is also "Wi-Fi Certified". Products that pass this certification are required to carry an identifying seal on their packaging that states "Wi-Fi Certified" and indicates the radio frequency band used (2.5GHz for 802.11b, 802.11g, 802.11n, and 5GHz for 802.11a.
A Wi-Fi network, in reality, is a network that complies with the 802.11 standard. Hardware devices certified by the Wi-Fi Alliance are allowed to use this logo:
With Wi-Fi, it is possible to create high-speed wireless local area networks, provided that the computer to be connected is not too far from the access point. In practice, Wi-Fi can be used to provide high-speed connections (11 Mbps or greater) to laptop computers, desktop computers, personal digital assistants (PDAs) and any other devices located within a radius of several dozen metres indoors (in general 20m-50m away) or within several hundred metres outdoors.
Wi-Fi providers are starting to blanket areas that have a high concentration of users (like train stations, airports, and hotels) with wireless networks. These access areas are called "hot spots".
Wi-Fi Technology
The beauty of the ESS is Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: IEEE 802.11 is a set of standards carrying out wireless local area network (WLAN) computer communication in the 2.4, 3.6 and 5 GHz frequency bands. They are created and maintained by the IEEE LAN/MAN Standards Committee (IEEE 802). The base current version of the standard is IEEE 802.11-2007.
The popular Linksys WRT54G contains an 802.11b/g radio with two antennas.
Standards are given as follows-
The various Wi-Fi standards with name and description
The IEEE 802.11 standard is actually only the earliest standard, allowing 1-2 Mbps of bandwidth. Amendments have be made to the original standard in order to optimise bandwidth (these include the 802.11a, 802.11b and 802.11g standards, which are called 802.11 physical standards) or to better specify components in order to ensure improved security or compatibility.
Naveen Kumar Gautam
[attachment=12441]
History
Back in 1991 Wi-Fi was invented by NCR Corporation/AT&T (later on Lucent & Agere Systems) in Nieuwegein, the Netherlands. Initially meant for cashier systems the first wireless products were brought on the market under the name WaveLAN with speeds of 1Mbps/2Mbps. Vic Hayes who is the inventor of Wi-Fi has been named 'father of Wi-Fi' and was with his team involved in designing standards such as IEEE 802.11b, 802.11a and 802.11g. In 2003, Vic retired from Agere Systems. Agere Systems suffered from strong competition in the market even though their products were cutting edge, as many opted for cheaper Wi-Fi solutions. Agere's 802.11abg all-in-one chipset (code named: WARP) never hit the market, Agere Systems decided to quit the Wi-Fi market in late 2004.
The technical issues surrounding WiFi are quite important. It all began in October 1999 with the introduction of the IEEE standard 802.11b protocol. This offered a 5 Mbit/s transfer speed and an effective range of 150-300 ft. Although not quite fast enough for everyone, it soon became very popular, offering clear benefits in terms of freedom over wired connections. A new standard was under development and became popular even before it was ratified in June 2003. 802.11g increased the data rate to about 22 Mbit/s, which is not exactly future proof, but more than enough for most people. The new standard was completely backward compatible, so people with the old hardware could use it with the new hardware. This made for a seamless transition.
Introduction
Wireless Technology is an alternative to Wired Technology, which is commonly used, for connecting devices in wireless mode. The name of a popular wireless networking technology that uses radio waves to provide wireless high-speed Internet and network connections.
Wi-Fi (Wireless Fidelity) is a generic term that refers to the IEEE 802.11 communications standard for Wireless Local Area Networks (WLAN-defined by Wi-Fi Alliance). The Wi-Fi Alliancethe organization that owns the Wi-Fi (registered trademark) term specifically defines Wi-Fi as any "wireless local area network (WLAN) products that are based on the Institute of Electrical and Electronics Engineers' (IEEE) 802.11 standards."
Wi-Fi Network connect computers to each other, to the internet and to the wired network.
Wi-Fi is supported by many applications and devices including video game consoles home networks, PDAs, mobile phones major operating systems and other types of consumer electronics. Any products that are tested and approved as "Wi-Fi Certified" (a registered trademark) by the Wi-Fi Alliance are certified as interoperable with each other, even if they are from different manufacturers. For example, a user with a Wi-Fi Certified product can use any brand of access point with any other brand of client hardware that also is also "Wi-Fi Certified". Products that pass this certification are required to carry an identifying seal on their packaging that states "Wi-Fi Certified" and indicates the radio frequency band used (2.5GHz for 802.11b, 802.11g, 802.11n, and 5GHz for 802.11a.
A Wi-Fi network, in reality, is a network that complies with the 802.11 standard. Hardware devices certified by the Wi-Fi Alliance are allowed to use this logo:
With Wi-Fi, it is possible to create high-speed wireless local area networks, provided that the computer to be connected is not too far from the access point. In practice, Wi-Fi can be used to provide high-speed connections (11 Mbps or greater) to laptop computers, desktop computers, personal digital assistants (PDAs) and any other devices located within a radius of several dozen metres indoors (in general 20m-50m away) or within several hundred metres outdoors.
Wi-Fi providers are starting to blanket areas that have a high concentration of users (like train stations, airports, and hotels) with wireless networks. These access areas are called "hot spots".
Wi-Fi Technology
The beauty of the ESS is Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: IEEE 802.11 is a set of standards carrying out wireless local area network (WLAN) computer communication in the 2.4, 3.6 and 5 GHz frequency bands. They are created and maintained by the IEEE LAN/MAN Standards Committee (IEEE 802). The base current version of the standard is IEEE 802.11-2007.
The popular Linksys WRT54G contains an 802.11b/g radio with two antennas.
Standards are given as follows-
The various Wi-Fi standards with name and description
The IEEE 802.11 standard is actually only the earliest standard, allowing 1-2 Mbps of bandwidth. Amendments have be made to the original standard in order to optimise bandwidth (these include the 802.11a, 802.11b and 802.11g standards, which are called 802.11 physical standards) or to better specify components in order to ensure improved security or compatibility.
