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How WI-FI Technology works

Wi-Fi (Wireless Fidelity) is a generic term that refers to IEEE 802.11 standard for Wireless Local Area Networks (WLANs). free ppt download
WiFi TechnologyContents  Introduction  WiFi Technology  WiFi Network Elements  WiFi Network Topologies  Hotspots  How a WiFi Network Works  Advantages  Limitations  ConclusionIntroduction  WiFi (Wireless Fidelity) is a generic term that refers to IEEE 802.11 standard for Wireless Local Area Networks(WLANs).  WiFi Network connect computers to each other, to the internet and to the wirednetwork.The WiFi Technology WiFi Networks use Radio Technologies to transmit and receive data at high speed:  IEEE 802.11b  IEEE 802.11a  IEEE 802.11gIEEE 802.11b  Appear in late 1999  Operates at 2.4GHz radio spectrum  11 Mbps (theoretical speed) within 30 m Range  46 Mbps (actual speed)  100 150 feet range  Most popular, Least Expensive  Interference from mobile phones and Bluetooth devices which can reduce the transmission speed.IEEE 802.11a  Introduced in 2001  Operates at 5 GHz (less popular)  54 Mbps (theoretical speed)  1520 Mbps (Actual speed)  5075 feet range  More expensive  Not compatible with 802.11bIEEE 802.11g  Introduced in 2003  Combine the feature of both standards (a, b)  100150 feet range  54 Mbps Speed  2.4 GHz radio frequencies  Compatible with„b‟Elements of a WIFI Network  Access Point (AP) The AP is a wireless LAN transceiver or“basestation” that can connect one or many wireless devices simultaneously to the Internet.  WiFi cards They accept the wireless signal and relay information. They can be internal and external.  Safeguards Firewalls and antivirus software protect networks from uninvited users and keep information secure.WiFi Network Topologies  Peertopeer topology (Adhoc Mode)  APbased topology (Infrastructure Mode)Peertopeer topology  APis notrequired.  Client devices within a cell can communicate with each otherdirectly.  It is useful for setting up a wireless network quickly andeasily.Infrastructure network  The client communicate through Access Point.  Any communication has to go through AP.  If a Mobile Station (MS), like a computer, a PDA, or a phone, wants to communicate with another MS, it needs to send the information to AP first, then AP sends it to the destination MS.Hotspots  A Hotspot is a geographical area that has a readily accessible wireless network  Hotspots are equipped with Broad band Internet connection and one or more Access points that allow users to access the internet wirelessly  Hotspots can be setup in any public location that can support an Internet connection. All the locations discussed previously are examples of Hotspots.How a WiFi Network Works  A WiFi hotspot is created by installing an access point to aninternetconnection.  Anaccesspointactsasabasestation.  When WiFi enabled device encounters a hotspot the device canthenconnecttothatnetworkwirelessly.  A single access point can support up to 30 users and can function within a range of 100– 150 feet indoors and up to 300feetoutdoors.  Many access points can be connected to each other via Ethernetcablesto createa singlelargenetwork.Advantages  Mobility  Ease of Installation  Flexibility  Cost  Reliability  Security  Use unlicensed part of the radio spectrum  Roaming  SpeedLimitations  Interference  Degradation in performance  High power consumption  Limited rangeConclusion  WiFi is a simple and cost effective way to connect to internet without the need of wires.  It is growing in popularity because of decreasing costs and the freedom it gives to users.•Thank you Any question Please write us on queriesthesisscientist.com