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INTRODUCTION

An expensive broadband network that can

keep you connected while you move about

home or office. the broadband wireless web is being built

around the technology called WI-FI.

WI-FI is stand for WIRELESS FIDELITY.

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WHAT IS WI-FI?

WI-FI is a trade-group certified wirelessnetworking standard that relies on the IEEE802.11a and 802.11b specification.

802.11b specification allows for thewireless transmission of approximately 11mbps of raw data at indoor distances from

several dozen to several hundred feet andoutdoor distances of several to tens of milesas an unlicensed use of 2.4 ghz band.

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The 802.11a specification uses 5Ghz band

and can handle 54 mbps at typically shorter

distances.The distances for both standards depends on

impediments,materials and line of sight.

WI-FI is an extension of ethernet,bringing

the same principles to wireless

communication.

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WHY WI-FI?

1) MOBILITY

2) SCALABILITY

3) INCRESED RELIABILITY 4) REDUCED INSTALLATION TIME

5) FINANCIAL BENEFIT

6) LONG TERM COST SAVINGS

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WI-FI STANDARDS

1) 802.11:

This standard allows wireless connection

up to 300 feet from an access point and can easilybe added to existing wired networks with speeds

up to 11 mbps.

2) 802.11a:

This provides a bigger pipe for data and

supports more simultaneous users.

it can support up to 54 mbps.

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3) 802.11b:

The popular 802.11b WI-FI

devices broadcast in the 2.4Ghz band usedby cordless phones.

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COMPONENTS OF WI-FI

There are currently two types ofcomponents.

1) WI-FI radio devices

2) Access points or gateway that act asbasestation.

A third type WI-FI equipped

peripherals are emerging and will soon becommonplace.this group includesprinters,scanner ,cameras etc.

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Some components of WI-FI

j PC CARD RADIO.

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j MINI-PCI

MODULES AND

EMBEDDED

RADIOS.

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j USB ADAPTERS

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j PCI AND ISA BUS

ADAPTERS.

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j ACCESS POINTS

AND GATEWAY.

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WHAT TRANSMISSION

TECH.WI-FI USED?1) NARROWBAND TECHNOLOGY

2) SPREAD SPECTRUM TECHNOLOGY

3) FREQUENCY HOPPING SPREADSPECTRUM (FHSS).

4) DIRECT SEQUNCE SPREAD

SPECTRUM (DSSS).

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ABOUT NETWORK

WHAT MAKES UP A WIRELESS NETWORK

?

Wi-Fi devices "connect" to each other by

transmitting and receiving signals on a specific

frequency of the radio band. Your components can

connect to each other directly or through a

gateway oraccess point. When you create your

Wi-Fi network it will consist of two basic

components: Wi-Fi radios and access points orgateways.

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PLANNING FOR ACCESS POINTS AND

GATEWAY..

A Wi-Fi network operates more effectivelywhen using a central wireless base station to

coordinate communications. There are two

types: a gateway and an access point.

Most home and small office networks should

use a Wi-Fi gateway.

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HOW MANY USERS CAN USE

A SINGAL ACCESS POINT?j Wi-Fi neWtworks, like wired networks, are a

shared medium. An 802.11b Wi-Fi network mayprovide 11 Mbps of bandwidth to an individual

user. Theoretically, if ten users are simultaneouslyusing the network, each will have to share andmay only get 1 Mbps or so each. However,network sharing is not quite this simple. A lotdepends on the users' behaviors. Someone who is

just sending and receiving e-mail just uses thewireless connection in bursts. They will probablynever notice any slow down.

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j On the other hand, a roomful of Wi-Fi users who

are accessing high-resolution multimedia over a

single access point may indeed notice a slowdown.

j A singal access point can easily handle 10 to 30

users who use the n/w for sending or receving e-

mail.

j Within typical office environment most access

point can provides good wireless coverage up to

150 feet or so.

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HOW TO INSTALL YOUR

ACCESS POINT OR GATEWAYj During the installation, make sure you follow the

manufacturer's instructions to install an access

point- or gateway-based network, not a peer-to-

peer network. For most Wi-Fi systems, you mustfirst plug in and power up the base station. Then

connect the Ethernet cable from your DSL or

cable modem to the base station. If your

broadband connection is already connected to yourcomputer, disconnect that cable and attach it to

your base station.

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j Most cable and DSL modems use Ethernettechnology (cable and built in card) to connect tocomputers or to networks. However, some

versions of DSL or cable modemsuse a

USBcable to connect to computers. Find out whichyour system uses because few if any Wi-Fi accesspoints can use USB for their broadbandconnection. If your broadband modem connects

using a USB cable, you then need to buy thecorrect RJ-45 Ethernet cable to connect yourmodem to your Wi-Fi gateway or access point.

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INSTALL THE FIRST WI-FI

RADIO DEVICE..j After carefully reviewing instructions, install the

Wi-Fi radio device in the first computer. If you're

installing devices in both desktops and laptops,

start with the machine with the newest operatingsystem. Follow the manufacturer's instructions to

be sure you're configuring them to work with your

base station and not as a peer-to-peer network. If

all your OS's, or operating systems, are about thesame, begin by installing PC Card radios in the

laptops and then install in the desktops

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HOE DO U CONNECT YOUR WI-FI

N/W TO THE INTERNET ?

j WI-Fi You can use a variety of high-speed

Internet connections with a Wi-Fi network,

including cable modems, different types of DSL,

satellite broadband, etc. Your broadband Internetconnection will connect to your gateway or access

point, and its Internet connection will be

distributed to all the computers on your network.

And don't worry about Wi-Fi slowing down yourconnection speed: it's at least four times faster than

the fastest of any of these connection.

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TOPOLOGY DESIGN AP..

jWE HAVE TO DESIGN AP BY WHICH

WE CAN GET MINIMUM OVERLAP

AND MAXIMUM FIDELITY.

j Here Klskf will discuss on ideal AP

coverage,the coverage volume of the AP is

shown in fig as three coaxial cylinders.

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j Middle cylinder

reprensting coverage on

floor on which the axis

point is located with

radius R.

j The upper and lower

cylinder reprensting the

coverage on the floors

above and below the oneon which the AP is locate

with radius R less than R.

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DESIGN PROCEDURE..

jFOLLOWING ARE THE FOUR

SCENARIO WHICH Klskf USED TO

DESIGN.

j Solid lines show coverage on a floor.

j Dashed line show adjacent floor coverage.

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j Scenario 1 : single-floor linear array,

illustrated in fig A

single story buildingwhose width is not

large relative to R,D

denotes the

distance betweenadjacent Access

points

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j Scenario 2 :

j single floor rectangulararray illustrated in fig A

single story buildingwhose width(smallestouter dimension)is largerelative to R D denotesthe distance between

two AP's .

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j Scenario 3

j : multi floor linear

array illustrated in figA multistory buildingwhose width is notlarge relative to R and

R' ,D' denotes thedistance betweenadjacent APs ondifferent floors.

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j Scenario 4: Multi floor

rectangular array ,

illustrated in fig A

multistory building whose

width is large relative to

R and R',D denotesthe

distance between adjacent

APs on the same floor ,

and D' denotes thedistance between adjacent

APs on different floors

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WI-FI VS BLUETOOTH..

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WI-FI SECURITY

jWI-FI CERTIFIED = CONFIDENCE

jWI-FI PROTECTED ACCESS

jENHANCED DATA ENCRYPTIONTHROUGH TKIP(TEMPORAL KEY

INTEGRITY PROTOCOL).

j

WI-FI PROTECTED ACCESS FORHOME/SOHO.

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WI-FI APPLICATION..

j 1) WIRELESS EDUCATION

j 2) WIRELESS BUSINESS CENTERS

j 3) SMALL OFFICESj 4)HOSPITALS

j 5) ACCOUNTING

j 6) WAREHOUSE

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WI-FI PRODUCTS..

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CONCLUSION..

jFor now ,WI-FI primarily provides

broadband internet access to specially

outfitted pcs and laptops .but in future may

be most of hotspots be wireless.

jBy WI-FI our time and money both are

save..