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The World of Wi-Fi

The World of Wi-Fi. “Wireless Fidelity”. What is Wi-Fi?. Short for “wireless fidelity,” A high-speed wireless network that provides access to the internet, generally within a limited range (eg, 300ft.) of the transmission equipment. It consists of wireless Local area networks (WLAN).

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The World of Wi-Fi

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  1. The World of Wi-Fi “Wireless Fidelity”

  2. What is Wi-Fi? • Short for “wireless fidelity,” A high-speed wireless network that provides access to the internet, generally within a limited range (eg, 300ft.) of the transmission equipment. • It consists of wireless Local area networks (WLAN)

  3. What’s the Purpose • It was developed to be used for mobile computing devices, such as laptops, in LANs, but is now increasingly used for more services. • It includes services such as: Internet and VoIP phone access, gaming, and basic connectivity of consumer electronics such as televisions and DVD players, or digital cameras.

  4. Continued…. • A person with a Wi-Fi enabled device such as a computer, cell phone or PDA can connect to the Internet when in proximity of an access point. • The Region covered by one or several access points is called a hotspot. • They are found usually in restaurants, train stations, libraries, coffee shops, bookstores, and popular in Airports.

  5. Wi-Fi in Gaming • The Nintendo DS handheld is Wi-Fi compatible. • The Sony PSP includes WLAN to connect to Wi-Fi hotspots or make wireless connections.

  6. How it works!! • It contains one or more access points (APs) and one or more clients. • AP’s broadcast its SSID (Service Set Identifier, “Network Name”) via packets called beacons, which broadcast every 100ms. • Good=leaves connection criteria and roaming totally to the client • Bad=Wi-Fi doesn’t do collision detection, may corrupt connection and not allow it.

  7. Advantages of Wi-Fi • It is basically available around the world (13 devices for Europe, 11 for North America, and 14 for Japan). • Reduces the Cost of LAN’s because no cables are needed. • Silicon prices coming down, making Wi-Fi a very economical network option. • Widely available in More then 250,000 public hot spots.

  8. Disadvantages of Wi-Fi • Wi-Fi can be interrupted by other devices, notably 2.4 GHz cordless phones and microwave ovens. • Power Consumption is high compared to other standards, making battery life and heat a concern. • Wi-Fi networks have limited range. • Typical home router with a stock antenna might have a range of 45m (150ft) indoors and 90m (300ft) outdoors.

  9. Standard Wi-Fi devices • Wireless access point • Connects a group of wireless stations to adjacent wired local area networks. • Wireless Router= intergrates a wireless access point with an IP router and an ethernet switch. • Wireless Ethernet Bridge= connects a wired network to a wireless network. • Range Extender= can increase the range of an existing wireless network by being strategically placed in locations where a wireless signal is sufficiently strong and near by locations that have poor to no signal strength.

  10. Brief History of Wi-Fi • The precursor to Wi-Fi was invented in 1991 by NCR Corporation/AT&T (later Lucent & Agere Systems) in Nieuwegein, the Netherlands. Initially intended for cashier systems. • Vic Hayes the ‘father of Wi-Fi,” was involved in designing standards such as IEEE 802.11b

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