Wi-Fi

Slide 1: 

A Wi-Fi enabled device such as a PC, video game console, mobile phone, MP3 player or PDA can connect to the Internet when within range of a wireless network connected to the Internet. The coverage of one or more interconnected access points — called a hotspot — can comprise an area as small as a single room with wireless-opaque walls or as large as many square miles covered by overlapping access points. Wi-Fi technology has served to set up mesh networks, for example, in London. Both architectures can operate in community networks. To connect to access points

Slide 2: 

In addition to restricted use in homes and offices, Wi-Fi can make access publicly available at Wi-Fi hotspots provided either free of charge or to subscribers to various providers. Organizations and businesses such as airports, hotels and restaurants often provide free hotspots to attract or assist clients. There are already more than 300 metropolitan-wide Wi-Fi (Muni-Fi) projects in progress. There were 879 Wi-Fi based Wireless Internet service providers in the Czech Republic as of May 2008. A roof mounted Wi-Fi antenna

Slide 3: 

In the early 2000s, many cities around the world announced plans for a city wide Wi-Fi network. 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. A few were successful, for example in 2005, Sunnyvale, California became the first city in the United States to offer city wide free Wi-Fi. Few of the Municipal Wi-Fi firms have now entered into the field of Smart grid networks [clarification needed] City wide Wi-Fi

Slide 4: 

Unlicensed spread spectrum was first made available in the US by the FCC in rules adopted on May 9, 1985and these FCC regulations were later copied with some changes in many other countries enabling use of this technology in all major countries. The FCC action was proposed by Michael Marcus of the FCC staff in 1980 and the subsequent regulatory action took 5 more years. It was part of a broader proposal to allow civil use of spread spectrum technology and was opposed at the time by mainstream equipment manufacturers and many radio system operators. Key portions of the IEEE 802.11 technology underlying Wi-Fi (in its a, g, and n varieties) were determined to be infringing on U.S. Patent 5,487,069, which was filed in 1993by CSIRO, an Australian research body History

Slide 5: 

Large satellite dish modified for long-range Wi-Fi communications in Venezuela 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. The new IEEE 802.11n however, can exceed that range by more than double.[citation needed] Range also varies with frequency band Reach

Slide 6: 

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. Standard devices

CONCLUSION : 

CONCLUSION Thus we had a clear view about Wi-Fi