18-10-2012, 04:22 PM
wi- fi ppt
wi-fi.ppt (Size: 606.5 KB / Downloads: 30)
ABSTRACT
A wireless revolution is seeping into our daily lives never before. From homes, college campus, factory outlets and modern offices to social gathering points, the wireless factor has taken productivity to new levels. Institute and corporate entities all over the world have already made it possible to link PCs and notebooks to the internet, and not to forget the hotspots that are in abundance, which simply make your browsing experience all the more exciting.
INTRODUCTION
Many executives these days prefer handling a laptop with Wi-Fi capability than a desktop PC. The reason is pretty obvious: the person on field duty stays connected to the office, and with network connections that have wireless internet access, ‘the person’ is far more productive. Almost all mobile devices such as laptops, PDAs or tablet PCs are the most likely devices to use a wi-fi local area network (LAN).
So what exactly is Wi-Fi? Wi-fi, short for ‘Wireless-Fidelity’, is the popular term for a high frequency wireless Local Area Network WLAN).
Wi-Fi (Wireless Fidelity)-enabled laptop or palmtop computers use radio signals to communicate with networks on an unlicensed 2.4GHz band in order to provide a broadband Internet access. Wireless networking enables mobilized workforce, increased productivity, allows users to be connected even when they are not at their desks or even in their office.
THE DESIGN CRITERIA
To enable the full usage of wi-fi technology, network designers meet to consider both the wired & wireless element when designing a implementing highly available wireless networks. While designing a WLAN, they have to focus on minimizing security risks while creating a scalable design that the organization can afford to implement.
For example, a wired LAN in the entire office and WLAN –specific location such as conference rooms & cafes. If you have both types of networks, it’s important to make sure that the two types of LANs are compatible and manageable as though they were one network. This makes it easier and more cost-effective to administer security policies across both network types, as well as to handle routine troubleshooting.
Again, while designing a robust network, various obstacles such as walls and wood and glasses partitions should be taken into consideration
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Wireless transmissions are subject to attenuation and obstruction from indoor walls constructed with metal, concrete and other material. And besides, interference is also possible from other devices working on the same frequency (2.4 GHz), such as cordless phones and micro-wave ovens, and between two access points using the same channel.