CREATED BY :-•SHYAM NAIR•ABHEESH NAIR•DHANESHDHAMNASKAR•GOKUL NAIR
What is Wi-Fi ?Wireless Fidelity.(wi-fi) Wi-Fi is a simple, cost-effective way to connect tothe Internet. Wi-Fi is something that works without wires.Itminimizes the need for long cables running from oneend of the room to the other or from floor to floor. Implementing a Wi-Fi solution could thus even becheaper than implementing a conventional, wiredsolution, as not only does it eliminate the need forlong Network Cables, it also does not need a NetworkSocket for every Computer!
A WiFi uses unlicensed radio spectrumD and does not require regulatory approval for individual deployersVA Prices are considerably lower asN competition amongst vendors increases.TA Numerous access points and network interfaces support various degrees ofG encryption to protect traffic fromE interception.S
WiFi has a set of global standards. Not like the cellular carriers, the same WiFi users can work in different countries around the world at all time Itallows local areanetworks (LANs) to besetup with cabling. Thecan reduce associatedcosts of networkconnection andexpansions
1. Free access points can be used by the malicious to D anonymous to initiate an attack that would be I extremely difficult to track beyond the owner of S the access point. A D3. Access points could be used to Vsteal personal and confidential Ainformation transmitted from WiFiconsumers N T 2. Inter-operability issues A between brands or G deviations can cause limited connection or lower E output speeds. S
Access points could beused to steal personaland confidentialinformation transmittedfrom WiFi consumers •The spectrum assignments and operational limitations are notconsistent worldwide.Power consumption is fairly highcompared to some otherstandards, making the battery lifeand heat a concern to some users.
• The most common wireless encryptionstandard, wired equivalent privacy orWEP has been shown to be breakable evenwhen it has been correctly configured•WiFi networks have limited range. A typicalWiFi home router might have a range of 45m(150ft) indoors and 90m (300ft) outdoors.Ranges may also vary as WiFi is noexception to the physics of radio wavepropagation with frequency band. •WiFi uses the unlicensed 2.4GHz spectrum, which often crowded with other devices such as Bluetooth, microwave ovens, cordless phones, or video sender devices, and among many others. This may cause degradation in performance.
FEATURES OF WIFI Unmatched mobility and elasticity new intensity of connectivity without giving up functions introduced various types of utilities such music streamers that transmit your music to speakers without any wire Fortress Technology providing secure wireless solutions support the growth release of a prototype mobile ad hoc wireless network for use in the wireless strategic skirmish.
Support an entire age bracket. support an entire age bracket create a connection between components on the same network have ability to transfer data between the devices enable different kind of devices such as game,and much more
Its convenient and every where range station exists you are online during travel you can equip with a Wi-Fi network and set up shop anyplace. connect with internet if you are near hotspot. These days WiFi exist every where with all its wonders. WiFi with no limitation it can connect you worldwide. WiFi networking applications because the power consumption is very high as compared to other bandwidth
Security concerns simple to set Wi-Fi network but keeping it secure takes much more effort Access points of Wi-Fi do not deploy encryption methods. Secure Wi-Fi network can be easily attacked by hackers to steal private information.
Interference from other devices Wi-Fi transmits data at 2.4 GHz making susceptible to interfere Bluetooth enabled devices. Microwaves and other communication devices, closer the interfering devices are the poor communication will be and vice versa.Lacking high-quality media streaming High definition video and audios cannot be viewed flawlessly because of lower transfer rate
things can be much more worst if other clients areaccessing the same access points. High-definition audio and video files are timely-delivery-intensive, and typical wireless networks have neither the transfer speeds nor the consistency to transfer them flawlessly.
PARTS OF WIFI ------------------------------------------------------------------------ Wireless Routers One of the main parts of the wireless networks connect the DSL and the modem used in the networking from that particular Wifi device. Every type of router can be able to support different type of protocols and also supports the firewall setting to provide the protection to the networking system.
Antennas Two different types of antennas :- 1. omni directional 2. Directional directional antennas can communicated with the other device in a specific direction omni directional can do communication between the 360 degree angle. Wireless Network Adapters used to connect the system wirelesslysupports every standard of the wired or the wireless networks
Wireless Access Point The purpose of using the wireless access points in the Wifiis to create a connection between the Ethernet cable and thewireless users. Wireless access point also work as centre point for the user called as infrastructure.data transmission between the wireless and the wireddevices the connection of the wireless access point isconnected with wireless router and then the router integratesbetween the WAP and NS.
Wireless Print Server wireless pint servers are also equipped with the Wifi device for the sake of the connecting or sharing the two or more different printers They are connected wit the help of USB cables. Ports and the cables really play a major role as an equipment of the Wifi because they are the source of connecting different devices that are external to the wireless LAN or the Wifi device. Fiber cables are also used for such purpose.
How does wi fi ? works A wireless network uses radio waves, just like cell phones,televisions and radios do communication across a wireless network is a lot like two-wayradio communication.The radios used for WiFi communicationare very similar to the radios used for walkie-talkies, cell phonesand other devices. They can transmit and receive radio waves, and they canconvert 1s and 0s into radio waves and convert the radio wavesback into 1s and 0sWiFi radios have a few notable differences from otherradios.They transmit at frequencies of 2.4 GHz or 5 GHz
This frequency is considerably higher than thefrequencies used for cell phones, walkie-talkies andtelevisions. The higher frequency allows the signal to carry moredata----802.11a transmits at 5 GHz and can move up to 54megabits of data per second.----802.11b is the slowest and least expensive standard---802.11g transmits at 2.4 GHz like 802.11b, but its a lotfaster -- it can handle up to 54 megabits of data persecond.
----802.11n is the newest standard that is widely available.This standard significantly improves speed and range. Thestandard is currently in draft form -- the Institute of Electricaland Electronics Engineers (IEEE) plans to formally ratify802.11n by the end of 2009.
-Uses for common man Person uses wifi or otherwireless connection tocommunicate to groups ofaudiences -Wi-Fi CERTIFIED handsets mean service providers can be confident that the devices on their network are going to deliver the very best experience to their subscribers -Wi-Fis advanced performanceand wide availability inhomes, schools, enterprises andhotspots are key drivers of globaluser affinity for the technology.
-Uses for an enterprisesWi-Fi CERTIFIED devices offers the security and performancethat network managers expect along with five times thethroughput and twice the range of legacy Wi-Fi equipment Wi-Fi CERTIFIED programs provide a third-party seal of approval for interoperability and security of enterprise- grade equipment. The Wi-Fi CERTIFIED interoperability certificate is the definitive record of a products testing.Faster transmissions allow stations to get on and off the airmore quickly. Legacy clients in the network can benefit frombetter coverage provided by the 802.11n access points and theycan also gain increased access as the new 802.11n devicestransfer their data faster
3G vs Wi-Fi – Functioning3G is a service that is completely provided by the service provider, whereasWi-Fi access can be controlled by a Wi-Fi router located in a specific rangefrom the access point. For availing the Wi-Fi facility, you will have to visit ahotspot which provides a Wi-Fi zone. Today, most malls, cafes, and majorstreets have Wi-Fi routers for quick Internet access. For availing 3G, you needto get in touch with your service provider.3G vs Wi-Fi - Range and SignalThe 3G technology scores well over Wi-Fi with regards to range and signal.Since it depends on the mobile service provider, you will receive signalreception as long as you are in the network range. In case of Wi-Fi, you will beable to receive reception as long as you are within the range ofthe router situated in the hotspot. Therefore, while traveling, using 3G access ismore appropriate. However, 3G signals may drop if you are traveling away frommetropolitan cities.
3G vs Wi-Fi - SpeedWhen it comes to the speed of both these technologies, Wi-Fi is faster ascompared to 3G. The maximum speed of the N standard of the latest Wi-Fitechnology is reported to be 600 mbps. The data transfer speeds in 3Gtechnology differs according to the kind of device and also whether it isstationary or in motion. The maximum speed on 3G network is considered to beabout 2.05 mbps. However, if the reception is to be initiated on a cell phone in amoving vehicle, the speed can drop down to 128 kbps.3G vs Wi-Fi - CostThe cost of 3G access depends on the plan you have chosen from yourservice provider. When it is regarding availing Wi-Fi facilities, you might haveto pay the owners of the hotspots. Wi-Fi at some hotspots is free, while othersmay charge a certain amount. Users of the Wi-Fi facility at hotels and cafescan either pay using a credit card on a payment page hosted by theappropriate authorities, or can pay in cash for getting the network accesscode. Some hotspots are even code free, and you can directly access theweb without the access password.
Bluetooth vs. Wi-Fi :Both have lots offeatures of connectivity, printing andtransferring of data. No doubt Wi-Fi andBluetooth is the basic need of modern agebut have some differentiation as follow The technology of Bluetooth is functional when broadcasting of information among more than two devices exist near as headset, modem, printer etc while Wi-Fi operating on full scale because it is a much faster than Bluetooth. The hardware requirements of Wi-Fi and Bluetooth are entirely different, Through Bluetooth adapter you can connect devices with each other. While in Wi-Fi network you need an adapter, router and access point to enable connection. The bandwidth required for Bluetooth is only 800 kbps and for Wi-Fi 11Mbps bandwidth require. Wi-Fi network come into existence in 1991 and Bluetooth in 1994.The specification of Bluetooth is SIG and Wi-Fi is IEEE, and WECA.
The security level of both Bluetooth and Wi-Fi is also different from eachother. Bluetooth has only 2 level of password to wrap little distance and escapeuser time.Wi-Fi is a risky network because when lots of network attached with each otherthen hacker may try to access toward connected user and if succeed your datamay be stolen.
Comparing Wi-Max to Wi-Fi is akin tocomparing apples to oranges. Initially it’seasy to see why the comparison wouldexist Uses of Wi-Fi vs. the uses of WiMAX Wi-Fi is mostly used to provide a Wi-Fi enabled device such as a computer, cell phone or PDA an Internet/LAN connection when in proximity of an access point. Wi-Fi can also be used to create a mesh network. Wi-Fi also allows connectivity in peer-to-peer mode, which enables devices to connect directly with each other. WiMAX on the other hand with its higher bandwidth and longer reach is planned to be used for connecting Wi-Fi hotspots with each other and to other parts of the Internet, providing a wireless alternative to cable and DSL for last mile (last km) broadband access, providing high-speed mobile data and telecommunications services (4G).
Capacity of Wi-Fi vs WiMAXBoth the Wi-Fi and the WiMAX connectivity are dependent on the distance oftwo connection points (antennas). Keeping this in mind we can see that whenusing Wi-Fi with the IEEE 802.11g standard, which is the most commonstandard used on today’s equipment, the data rate is around 54 Mbit/s and therange indoors are around 30 meters. This range and data rate is changed withthe conditions of the area used and the line of sight of devices used.WiMAX will deliver 70 Mbit/s, 112 kilometers in theory. But these numbers willchange according to conditions, expected values are 10Mbit/s in a 2 KM area.