Introduction to Wi-Fi

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Introduction to Wi-Fi, its working & difference b/w bluetooth & wi-fi.

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Introduction to Wi-Fi tecnology:

Introduction to Wi-Fi tecnology keshav

History :

History Its origins in a 1985 ruling by the US Federal Communications Commission that released the ISM band for unlicensed use. The first wireless products were under the name WaveLAN . Vic Hayes has been called the "father of Wi-Fi". In 1992 and 1996, Australian organisation the CSIRO obtained patents for a method later used in Wi-Fi to " unsmear " the signal. In April 2009, 14 tech companies agreed to pay CSIRO for infringements on the CSIRO patents. keshav

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What is WIFI ? Wi-Fi allows you to use your computer or other device to connect to the internet from anywhere there is a Wi-Fi access point (often known as a hot Spot) keshav

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Comparison of standards The table below provides a brief overview of the four most popular current 802.11 standards. Standard Frequency Data Transfer Rate Typical (Max) Range (indoor) 802.11a 3.7/5 GHz 20 (54) Mb/sec about 35 m (115 ft) 802.11b 2.4 GHz 5.5 (11) Mb/sec 38 m (125 ft) 802.11g 2.4 GHz 22 (54) Mb/sec 38 m (125 ft) 802.11n 2.4/5 GHz 110+ (300+) Mb/sec 70m (230ft) keshav

Advantages of Wi-Fi :

Advantages of Wi-Fi Unparalleled mobility and flexibility Quick, easy setup Fast data transfer rates keshav

Limitations of Wi-Fi:

Limitations of Wi-Fi Security concerns Interference from other devices Data security risks keshav

Securing your Wi-Fi network :

Securing your Wi-Fi network The best choice for wireless network encryption is currently Wi-Fi Protected Access (WPA2) . Most newer access points support WPA2 encryption, and it can be configured once your network has been set up. Bluetooth wireless technology, on the other hand, has security built in, and it automatically requires devices to enter a passkey in order to connect to the network. See our introduction to Bluetooth for more information on how Bluetooth works. keshav

Current Wi-Fi Applications :

Current Wi-Fi Applications Apple AirPlay :- One of Apple's latest technologies is AirPlay — a proprietary wireless media streaming system for use with devices that use iTunes® 10 (such as a computer or iPhone ®) and a variety of compatible audio and video components. AirPlay lets you stream music, photos, and video stored on your computer, iPad ®, iPhone , or iPod touch® to your receiver or TV via Apple's Apple TV. You can also stream music to any AirPlay -enabled device, like a speaker or receiver. keshav

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Whole-house connectivity You can do a variety of things over Wi-Fi that you might not expect. For example, you can listen to music in multiple rooms in your home on wireless speakers ; print documents anywhere in your house with a wireless printer ; and update your Wi-Fi-enabled digital photo frame without even hooking up a camera or memory card. Plus, the possibilities are continuing to grow. keshav

Range :

Range Wi-Fi networks have limited range. A typical wireless access range of 32 m (120 ft) indoors and 95 m (300 ft) outdoors. On wireless routers with detachable antennas, it is possible to improve range by fitting upgraded antennas which have higher gain in particular directions. Outdoor ranges can be improved to many kilometers through the use of high gain directional antennas at the router and remote device/ keshav

Hardware :

Hardware An embedded RouterBoard 112 with U.FL - RSMA pigtail and R52 mini PCI Wi-Fi card widely used by wireless Internet service providers ( WISPs ) in the Czech Republic OSBRiDGE 3GN - 802.11n Access Point and UMTS/GSM Gateway in one device keshav

Multiple access points :

Multiple access points Increasing the number of Wi-Fi access points provides network redundancy, support for fast roaming and increased overall network-capacity by using more channels or by defining smaller cells . Wi-Fi implementations have moved toward "thin" access points, with more of the network intelligence housed in a centralized network appliance, relegating individual access points to the role of "dumb" transceivers. Outdoor applications may use mesh topologies. keshav

Diff.b\w Bluetooth & Wi-Fi:

Diff.b \w Bluetooth & Wi-Fi keshav

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Thanks keshav

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