Presented ByRavindra Singh Electrical Engg. 2nd Year,4th Sem Roll No.-32

8/14/2019 Presented ByRavindra Singh Electrical Engg. 2nd Year,4th Sem Roll No.-32

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WiWi--FiFi

Presented by-Presented by

-Ravindra singhRavindra singh

Electrical engg.Electrical engg.22ndnd year,4year,4thth semsem

Roll no.-32Roll no.-32


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contentscontents

HistoryHistory meaning of the term "Wi-Fi"meaning of the term "Wi-Fi" Commercial wi-fiCommercial wi-fi Building a Wireless NetworkBuilding a Wireless Network How it works?How it works?

Example of WiFi DevExample of WiFi Devicesices Advantages of WiFiAdvantages of WiFi Universal effortsUniversal efforts WiFi in GameingWiFi in Gameing Disadvantages of Wi-FiDisadvantages of Wi-Fi WiFi in Operating SystemsWiFi in Operating Systems

WiFi SpecificationsWiFi Specifications HotSpoHotSpott Power BrickPower Brick Wireless ModemsWireless Modems Web ServerWeb Server FireWallsFireWalls

Wireless NetworkingWireless Networking


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meaning of the termmeaning of the term ""WiWi--FiFi""

""WiWi--FiFi"" stands forstands for""Wireless FidelityWireless Fidelity".".

According to Belanger, theAccording to Belanger, the InterbrandInterbrand

Corporation developed the brandCorporation developed the brand ""WiWi--FiFi""for the Wifor the Wi--Fi Alliance to use to describeFi Alliance to use to describeWLAN products that are based on theWLAN products that are based on theIEEE 802.11 standardsIEEE 802.11 standards..


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What is WiWhat is Wi--fi?fi?

WiWi--fi is wireless networkingfi is wireless networking -- the abilitythe abilityto connect to a network or PC usingto connect to a network or PC using

radioradio ((as opposed to network cablingas opposed to network cabling).).It's faster and has a greater range thanIt's faster and has a greater range thanBluetoothBluetooth, and is ideal for home or, and is ideal for home oroffice connectivityoffice connectivity..
http://www.filesaveas.com/bluetooth.htmlhttp://www.filesaveas.com/bluetooth.htmlhttp://www.filesaveas.com/bluetooth.html


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historyhistory

WiWi--Fi uses both single carrier directFi uses both single carrier direct--sequence spreadsequence spreadspectrum radio technology, part of the larger family ofspectrum radio technology, part of the larger family ofspread spectrum systems and multispread spectrum systems and multi--carrier OFDMcarrier OFDM((Orthogonal Frequency Division MultiplexingOrthogonal Frequency Division Multiplexing)) radioradio

technologytechnology.. Unlicensed spread spectrum was first authorized by theUnlicensed spread spectrum was first authorized by the

Federal Communications Commission in 1985 and theseFederal Communications Commission in 1985 and theseFCC regulations were later copied with some changes inFCC regulations were later copied with some changes inmany other countries enabling use of this technology inmany other countries enabling use of this technology in

all major countriesall major countries.. These regulations then enabled theThese regulations then enabled thedevelopment of Widevelopment of Wi--Fi, its onetime competitor HomeRF,Fi, its onetime competitor HomeRF,and Bluetoothand Bluetooth..


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Commercial WiCommercial Wi--FiFi

Commercial WiCommercial Wi--Fi services are available inFi services are available inplaces such as Internet cafes, coffee housesplaces such as Internet cafes, coffee housesand airports around the worldand airports around the world ((commonly calledcommonly calledWiWi--FiFi--cafscafs)), although coverage is patchy in, although coverage is patchy in

comparison with cellularcomparison with cellular:Ozone and OzoneParis:Ozone and OzoneParis In France, in September 2003, Ozone startedIn France, in September 2003, Ozone started

deploying the OzoneParis network across thedeploying the OzoneParis network across theCity of LightsCity of Lights.. The objectiveThe objective:: to construct ato construct a

wireless metropolitan network with full Wiwireless metropolitan network with full Wi

--FiFi

coverage of Pariscoverage of Paris.. Ozone is also deploying itsOzone is also deploying itsnetwork in Brusselsnetwork in Brussels ((BelgiumBelgium)) and other cities inand other cities inFrance like RennesFrance like Rennes..


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Building a Wireless NetworkBuilding a Wireless Network

wireless routerwireless router is a single unit thatis a single unit thatcontainscontains::

A port to connect to yourA port to connect to yourcablecable ororDSLDSL modemmodem

AA routerrouter

An Ethernet hubAn Ethernet hub

AA firewallfirewall

A wireless access pointA wireless access point


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The typical WiThe typical Wi--Fi setup contains one or more AccessFi setup contains one or more AccessPointsPoints ((APsAPs)) and one or more clientsand one or more clients..

An AP broadcasts its SSIDAn AP broadcasts its SSID ((Service Set Identifier,Service Set Identifier,Network nameNetwork name)) via packets that are called beacons.via packets that are called beacons.

Based on the settingsBased on the settings ((ee..gg.. the SSIDthe SSID)), the client may, the client maydecide whether to connect to an APdecide whether to connect to an AP.. Also the firmwareAlso the firmwarerunning on the client Wirunning on the client Wi--Fi card is of influenceFi card is of influence.. Say twoSay twoAPs of the same SSID are in range of the client.APs of the same SSID are in range of the client.

the firmware may decide based on signal strength tothe firmware may decide based on signal strength towhich of the two APs it will connectwhich of the two APs it will connect.. The WiThe Wi--Fi standardFi standardleaves connection criteria and roaming totally open to theleaves connection criteria and roaming totally open to theclientclient..


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Here's a summary of wiHere's a summary of wi--fifi

hardware typeshardware types::Wireless Network Access PointWireless Network Access Point

Wireless USB DonglesWireless USB Dongles


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Laptop WiLaptop Wi--fi cardsfi cards

Wireless PCI Network CardWireless PCI Network Card

Connectivity cardsConnectivity cards


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The BT Home HubThe BT Home Hub

Mobiles & Handheld computersMobiles & Handheld computers

WiWi--fi phonesfi phones


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AAdvantagesdvantages oof Wi-Fif Wi-Fi

Allows LANs to be deployed without cabling,Allows LANs to be deployed without cabling,

potentially reducing the costs of networkpotentially reducing the costs of networkdeployment and expansiondeployment and expansion.. Spaces whereSpaces where

cables cannot be run, such as outdoor areascables cannot be run, such as outdoor areasand historical buildings, can host wireless LANsand historical buildings, can host wireless LANs..

Wi-Fi silicon pricing continues to come down,Wi-Fi silicon pricing continues to come down,making Wi-Fi a very economical networking optimaking Wi-Fi a very economical networking opti

on and driving inclusion of Wi-Fi in an ever-wideon and driving inclusion of Wi-Fi in an ever-widening array of devices.ning array of devices.


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Universal EoffortsUniversal Eofforts

users will share their bandwidth throughusers will share their bandwidth throughtheir personal wireless routers, which aretheir personal wireless routers, which are

supplied with specific softwaresupplied with specific software..

An example isAn example is FONFON, a Spanish start, a Spanish start--upupcreated in November 2005created in November 2005.. It aims toIt aims tobecome the largest network of hotspots inbecome the largest network of hotspots in

the world by the end of 2006 with 30the world by the end of 2006 with 30 000000access pointsaccess points..


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WiWi--Fi in gamingFi in gaming

The PlayStation 3 premium modelThe PlayStation 3 premium model (($600$600))features builtfeatures built--in Wiin Wi--FiFi

The Xbox 360 features 1 WiThe Xbox 360 features 1 Wi--Fi accessoryFi accessory:: AAwireless network adapterwireless network adapter..

The Sony PSP includes WLAN to connect to Wi-The Sony PSP includes WLAN to connect to Wi-Fi hotspots or make wireless connectionsFi hotspots or make wireless connections

The Nintendo DS features many current andThe Nintendo DS features many current andupcoming games that support the Nintendo Wi-Fiupcoming games that support the Nintendo Wi-Fi

Connection service such as Mario Kart DS, MetroConnection service such as Mario Kart DS, Metroid Prime: Hunters and Animal Crossing: Wild Worid Prime: Hunters and Animal Crossing: Wild Worldld


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Disadvantages of WiDisadvantages of Wi--FiFi

Spectrum assignments and operationalSpectrum assignments and operationallimitations are not consistent worldwidelimitations are not consistent worldwide

Power consumption is fairly highPower consumption is fairly highcompared to some other standards, makincompared to some other standards, making battery life and heat a concern.g battery life and heat a concern.


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WiWi--Fi and its support by operatingFi and its support by operating

ssystemsystemsMicrosoft Windows XP has good WiMicrosoft Windows XP has good Wi--FiFi

supportsupport.. It does not support WPA2 nativelyIt does not support WPA2 natively

and some other protocols need Windowsand some other protocols need Windows

updatesupdates..Microsoft Windows Vista has improvedMicrosoft Windows Vista has improved

WiWi--Fi support over Windows XP, but itFi support over Windows XP, but it

automatically connects to unsecuredautomatically connects to unsecurednetworksnetworks..


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WIFI SpecificationsWIFI Specifications

WiWi--Fi is based on the IEEE 802.11Fi is based on the IEEE 802.11specificationsspecifications..

There are currently four deployedThere are currently four deployed

802.11 variations802.11 variations:: -- 802.11a802.11a

802.11b802.11b

802.11g, and802.11g, and

802.11n802.11n..


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What is a HotspotWhat is a Hotspot

A hotspot is any public area where computersA hotspot is any public area where computers

that have been fitted with wireless networkthat have been fitted with wireless networktechnology can gain access to the Internettechnology can gain access to the Internet..

The computer accomplishes this by contacting aThe computer accomplishes this by contacting anearby wireless network with its internal NICnearby wireless network with its internal NIC

((Network Interface CardNetwork Interface Card).). The NIC seeks out theThe NIC seeks out theradio waves generated by wireless networksradio waves generated by wireless networks..

When it detects a signal strong enough, it asksWhen it detects a signal strong enough, it askspermission to log on to the networkpermission to log on to the network..

Wi l d t l i t


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Wireless adapters can plug intoWireless adapters can plug into

a computer's PC card slot ora computer's PC card slot or

USB portUSB port..


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What is aWhat is a Power BrickPower Brick ??

The power brick is part of the external powerThe power brick is part of the external powersupplysupply.. It also provides the power for theIt also provides the power for the

computer to charge its batteriescomputer to charge its batteries.. PluggingPluggingstraight AC from a wall outlet into a notebookstraight AC from a wall outlet into a notebookwould blow the circuits, so lowerwould blow the circuits, so lower--voltage DCvoltage DCpowers the notebookpowers the notebook..

The power brick accomplishes the conversionThe power brick accomplishes the conversion..The computer is plugged into the power brick,The computer is plugged into the power brick,while a cord runs from the power brick into awhile a cord runs from the power brick into astandard AC plugstandard AC plug..


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Wireless ModemsWireless Modems

Wireless modems are devices that allowWireless modems are devices that allowcomputers to connect to a wireless localcomputers to connect to a wireless local

area networkarea network ((WLANWLAN)) without physicalwithout physical

cabling such as ethernet wiringcabling such as ethernet wiring..Wireless modems use cellular, satellite orWireless modems use cellular, satellite or

WiFi protocols to connect to a WLAN,WiFi protocols to connect to a WLAN,

which can then provide Internet servicewhich can then provide Internet service..


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Web ServerWeb Server

Web servers are computers on the internet thatWeb servers are computers on the internet thathost websites, serving pages to viewers uponhost websites, serving pages to viewers uponrequestrequest.. This service is referred to as webThis service is referred to as webhostinghosting..

Every web server has a unique address so thatEvery web server has a unique address so thatother computers connected to the internet knowother computers connected to the internet knowwhere to find it on the vast networkwhere to find it on the vast network.. The IPThe IP((Internet ProtocolInternet Protocol)) address looks something likeaddress looks something likethisthis:: 69.93.141.14669.93.141.146.. This address maps to aThis address maps to amore human friendly address, such asmore human friendly address, such aswiseGEEKwiseGEEK..


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FirewallsFirewalls

Like the firewalls used in homes and buildings,Like the firewalls used in homes and buildings,

computer firewalls act as a barrier betweencomputer firewalls act as a barrier betweencomputers on a networkcomputers on a network..

For companies with a computer network or forFor companies with a computer network or forindividuals with a permanent connection to theindividuals with a permanent connection to the

internetinternet ((such as through DSL or cablesuch as through DSL or cable)), a, afirewall is criticalfirewall is critical.. Without a firewall, intruders onWithout a firewall, intruders on

the network would likely be able to destroy,the network would likely be able to destroy,tamper with or gain access to the files on yourtamper with or gain access to the files on your

computercomputer..


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Wireless NetworkingWireless Networking

Networking allows two or more computers toNetworking allows two or more computers to

interface with each other, whether in an office, ainterface with each other, whether in an office, alibrary or other type of establishment, or atlibrary or other type of establishment, or at

homehome.. Running cables throughout an office or aRunning cables throughout an office or ahouse can be tedious and timehouse can be tedious and time--consuming,consuming,

making wireless networkingmaking wireless networking -- a network ofa network ofinterfaced computers that doesn't require anyinterfaced computers that doesn't require any

hardwired connection between the computershardwired connection between the computers --the ideal choice for many businesses andthe ideal choice for many businesses and

homeshomes..


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A wireless router uses anA wireless router uses an

antenna to send signals toantenna to send signals towireless devices and a wire towireless devices and a wire to

send signals to the Internetsend signals to the Internet


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you plug in your router, it should startyou plug in your router, it should startworking at its default settingsworking at its default settings.. MostMostrouters let you use a Web interface torouters let you use a Web interface to

change your settingschange your settings..You can selectYou can select::The name of the network, known as itsThe name of the network, known as its

service set identifierservice set identifier((SSIDSSID))The channel that the router usesThe channel that the router uses Your router's security optionsYour router's security options


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To keep your network private, you can useTo keep your network private, you can useone of the following methodsone of the following methods::

Wired Equivalency PrivacyWired Equivalency Privacy (WEP)(WEP)

WiFi Protected AccessWiFi Protected Access (WPA)(WPA)

Media Access ControlMedia Access Control (MAC)(MAC)


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ThankingThankingyouyou

Presented ByRavindra Singh Electrical Engg. 2nd Year,4th Sem Roll No.-32

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