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Wireless LAN And ItsDifferent StandardsOverview Of WLANWLAN meansthat Wireless Local Area Network. Firstly, WLAN’s Standard is published by IEEEin July 1997. And then in September 1999, this standard is named as IEEE 802.11And 802.

11b is ratified as high rate standard.WLANdoes not use any physical connection. It totally rely on Wireless communicationusing Electromagnetic waves.

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And transmit data using electromagnetic waves. Nowa days 11Mbps data is transferred by Wireless Local Area Network. Today marketis also demand for wireless local area network.

Because WLAN does not use anyphysical connection.                                       FamilyOf  Standards Of WLAN   802.11(DSSS) 802.

11a 802.11b Application Wireless Ethernet LAN Wireless ATM Wireless Ethernet Data rate 1-2 Mbps 20-25Mbps 5.5Mbps, 11Mbps Frequency range 2.4GHz 5GHz 2.

4GHz  WLAN(Wireless LocalArea Network)WLANsometimes known as LAWN which is called local area wireless network. Everymobile user connect with local area network through wireless  or radio connection. Mostly WIFI andBluetooth is used to built WLAN. A WLAN user must verified or authenticationprocess.

Security is a problem of WLAN.WIFI And Bluetooth are the indoor technologies examples of WLAN.WLAN DevicesNow adays hundred number of devices of wireless local area network exists.

Due towhich to manage the these devices becomes difficult.Some ofthe Wireless Local Area Network Devices are listed below:1.     Cellphones 2.     Tablets3.     Laptops4.     Gamingconsoles5.     DifferentAudio Systems   Advantages Of WLANThereare many benefits of WLAN which are listed below:1.     Mobility:Oneof the big and main advantage of WLAN is mobility.

We can transfer data under agiven and specific range without using any physical connection. In organizationsdata is transferred by using WLAN. Because WLAN transfer data efficiently.2.

     Coverage Range:WLANtransfer data in its given range efficiently. The typically WLAN node range is100m. And move data from one access point to another.3.

     Easy to Use: WirelessLAN is easy to use. Because  ittransparent to user operating system. And user must have information about itsnew approaches(advancements) to take advantage of WLAN properly.4.     Scalability: WLANis scalable, in future we can enhance WLAN for our need by extending the nodesof WLAN . And Coverage  area can beincreased according to needs.5.     Sharing Files:Usercan share files and other data using wireless LAN more fastly and efficientlyinstead of wired LAN.

6.     Cost:Costof WLAN is less as compared to wired local area network. Because in Wired LANphysical connections are required but in WLAN no physical connection required. So its cost is less.Disadvantages Of WLANAlthoughthere are many benefits of wireless local area network but there are also manydisadvantages of WLAN, which of them, some are listed below:1.

     Speed:Filetransformation is slower using WLAN S compared to Wired local area network filetransformation.2.     Difficult To Set-up:Toset-up a Wireless area network is difficult for a person which have notechnical information or experience with computer.3.     Traffic Overloaded:Ifso many people are working on a single WLAN, then traffic become overloaded anddata transmission will be interrupted. Which is disadvantage of WLAN.4.     Flying Objects:Sometimesdata sending and receiving will be interrupted due to flying objects usingWireless local area network.

  Uses Of WLANWLAN is used in many ways in our life. Some arelisted below:HealthCare:Indifferent hospitals, WLAN is used for quick diagnostic purposes in an emergencysituation. In hospitals WLAN is widely used.InBusiness:Forbusiness purposes WLAN are being used. For example if you want send an email onargent basis to your client then you send your email or data using Wirelessarea network.

InSchools:Inschools WLAN are being used for educational purposes.Wireless LAN VS WiredLANIn wirednetwork physical connections(cables) are involved, to set-up a Wired LANconnection. Physical cable connects the computers to communicate with eachother.But inWireless Network no cables are required to transfer data or to communicate withone another.

Communication will be done without any physical connection. characteristics Wireless Network Wired Network Speed Low High Installation Easy Difficult to install(due to wires) Cost High (adapters, Routers are expensive) Low(only cables required) Cables Ethernet, copper and optical fibers Work on radio waves Security Weak (data can be encrypted) Strong (less chances to data encrypt) Hub and switches No need of hub and switches Hubs and switches are Required Standards 802.11a 802.11b 802.11g 802.

3 Standards Of WLAN And ItsAdvantage And DisadvantagesThereare some standards of WLAN developed by IEEE. Some of them are listed(will be discuss)below:802.11:Firsttime 802.11 standard of WLAN is developed by IEEE in 1997. But this standarddoes not fulfil the needs of the many users because its bandwidth is only 2Mbpswhich is much less for most of the applications. So mostly it does not supportmany applications.802.

11b:In 1999,802.11b standard is expanded by previous standard 802.11.

And its bandwidth is upto11Mbps . That’s why, it gain much popularity than previous standard. And IEEE 802.

11buses the frequency of 2.4GHz.Advantages:1.      Speed:       11Mbps2.      Costs:        Less3.      SignalRange:        has the best signal range.Disadvantages:1.       Data speed:                Transfer data  speed is low2.

      Frequency:         Uses the 2.4 gigahertz (GHz) offrequency 3.       One UserAccess:               Provides access to only  few users at a time duration.802.11a:IEEE developedsecond extension of previous(original) standard when IEEE 802.11b is I development.

But 802.11b got much popularity as compare to 802.11a standard.

Bothstandards are developed at the same time. 802.11b is best for home use and802.

11a is used for business purposes because 802.11a’s cost is high it is notused for home purposes802.11a bandwidthis 54Mbps. And its frequency is 5GHz.   Advantages:1.      Speed:            Uses up to Up to 54 Mbps 2.     Speed:            Fastest transmission speed.3.

      Simultaneoususers:           Allows for more simultaneous users.4.      Frequency:           Uses the 5 GHz frequency.5.      Interference:regulatedfrequencies prevent signal interference from other devices.Disadvantages:1.      HigherFrequency:a.

      Higherfrequency radio waves are more easily absorbed by obstacles such as walls.b.     Higherfrequency band has poorer range Also, some countries, do not permit the use ofthe 5 GHz ban.2.     Highest cost:              Cost is high.

3.     Compatibility:             Is not compatible with 802.11bnetwork adapters, routers, and access points.

802.11g:In 2002and 2003 another standard known as 802.11g developed. Which perform combinefunctionality of previous standards (i.

e 802.11a, 802.11b).This standardsupports upto 54Mbps bandwidth and frequency of 2.

4 GHz Advantages:1.      Speed:                        Uses Up to 54 Mbps, Has a transmissionspeed comparable to 802.11a under                           optimal conditions.

2.      Simultaneoususers:Allows for moresimultaneous users3.      BestSignal Range:Has the best signalrange and is not easily obstructed4.

      Compatibility:            Is compatible with 802.11b networkadapters, routers, and access pointsDisadvantages:1.      Interferenceproblems:              Uses the 2.

4 GHz frequency so ithas the same interference problems as 802.11b 2.     Cost:               Costsmore than 802.

11b802.11n:802.11nstandard is designed to improve the previous standards(802.11a, 802.11b and802.

11). 802.11n is commonly known as Wireless ‘N’. Instead  of one its bandwidth support multiple antennaand wireless signals.Due toits increased signal density this standard offers better range over WIFI.Advantages: Compatible with more products Faster Works over a greater distance Less prone to interference Better signal recovery Better security Ready for next generation multimedia ScalableDisadvantages:1.     Standardis not yet finalized2.     costsmore than 802.

11g3.     Theuse of multiple signals may greatly interfere with nearby 802.11b/g basednetworks.

 Characteristics Of  IEEE Standards IEEE Standard Frequency/Medium Speed Transmission Range 802.11 2.4GHz RF 1 to 2Mbps 20 feet indoors. 802.11a 5GHz Up to 54Mbps 25 to 75 feet indoors; range can be affected by building materials. 802.11b 2.4GHz Up to 11Mbps Up to 150 feet indoors; range can be affected by building materials.

802.11g 2.4GHz Up to 54Mbps Up to 150 feet indoors; range can be affected by building materials.

802.11n 2.4GHz/5GHz Up to 600Mbps 175+ feet indoors; range can be affected by building materials.   Wireless Standards and SpeedsThe Wi-Fi Alliance is a global, non-profitorganization that helps to ensure standards and interoperability for wirelessnetworks, and wireless networks are often referred to as Wi-Fi The originalWi-Fi standard (IEEE 802.11) was developed in 1997 by IEEE.

Since then manyvariations have emerged (and will continue to emerge). Wi-Fi networks use theEthernet protocol.  Standard Max Speed Typical Range 802.11a 54 Mbps 150 feet 802.11b 11 Mbps 300 feet 802.11g 54 Mbps 300 feet        

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