Wi fi Technology

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Wi fi Technology

  1. 1. By EHTISHAM ALI<br />Wi-Fi Technology<br />
  2. 2. Wi-Fi ?<br />The term Wi-Fi suggests Wireless Fidelity, resembling the long-established audio-equipment classification term high fidelity (in use since the 1930s) or Hi-Fi (used since 1950)<br />The term Wi-Fi, first used commercially in August 1999,was coined by a brand-consulting firm called Interbrand Corporation that the Alliance had hired to determine a name that was "a little catchier than Direct Sequence'".<br />
  3. 3. Access Point <br />A roof-mounted Wi-Fi antenna<br />A Wi-Fi enabled device such as a personal computer, video game console, smart phone or digital audio player can connect to the Internet when within range of a wireless network connected to the Internet. <br />An outdoor Wi-Fi access point<br />In the early 2000s, many cities around the world announced plans for city-wide Wi-Fi networks. This proved to be much more difficult than their promoters initially envisioned with the result that most of these projects were either canceled or placed on indefinite hold<br />
  4. 4. Advantages<br />Wi-Fi allows the deployment of local area networks (LANs) without wires for client devices, typically reducing the costs of network deployment and expansion. <br />A keychain-size Wi-Fi detector<br />Wi-Fi operates in more than 220,000 public hotspots and in tens of millions of homes and corporate and university campuses worldwide. The current version of Wi-Fi Protected Access encryption (WPA2) as of 2010 is consideredsecure, provided users employ a strong passphrase. <br />
  5. 5. A computer on the wireless adapter translates data into a radio signal and transmits through an antenna.<br />A wireless router receives the signal and decodes. The router sends information to the Internet using a physical, wired Ethernet connection<br />
  6. 6. Limitations<br />Wi-Fi networks have limited range. A typical wireless router using 802.11b or 802.11g with a stock antenna might have a range of 32 m (120 ft) indoors and 95 m (300 ft) outdoors.<br />The most common wireless encryption-standard, Wired Equivalent Privacy (WEP), has been shown to be easily breakable even when correctly configured. Wi-Fi Protected Access (WPA and WPA2) encryption, which became available in devices in 2003, aimed to solve this problem.<br />
  7. 7. Hardware<br />An embedded Router Board 112 with U.FL-RSMA pigtail and R52 mini PCI Wi-Fi card widely used by wireless Internet service providers<br />USB wireless adapter<br />OSBRiDGE 3GN - 802.11n Access Point and UMTS/GSM Gateway in one device<br />
  8. 8. Home Networking<br />If you have multiple computers networked in your home, you can create a wireless network with a wireless access point. If you have multiple computers that are not networked, or if you want to replace your Ethernet network, you need a wireless router. It is a single unit that contains:<br />1. A port to connect to your cable modem2. A router3. An Ethernet hub4. A firewall5. A wireless access point<br />

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