How Wifi works ppt

wi fi technology ppt download and latest technology in wireless communication ppt and ppt on latest technology
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Published Date:09-03-2017
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Wi-Fi TechnologyContents  Introduction  Wi-Fi Technology  Wi-Fi Network Elements  Wi-Fi Network Topologies  Hotspots  How a Wi-Fi Network Works  Advantages  Limitations  ConclusionIntroduction  Wi-Fi (Wireless Fidelity) is a generic term that refers to IEEE 802.11 standard for Wireless Local Area Networks(WLANs).  Wi-Fi Network connect computers to each other, to the internet and to the wirednetwork.The Wi-Fi Technology Wi-Fi 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  4-6 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)  15-20 Mbps (Actual speed)  50-75 feet range  More expensive  Not compatible with 802.11bIEEE 802.11g  Introduced in 2003  Combine the feature of both standards (a, b)  100-150 feet range  54 Mbps Speed  2.4 GHz radio frequencies  Compatible with„b‟Elements of a WI-FI 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.  Wi-Fi cards - They accept the wireless signal and relay information. They can be internal and external.  Safeguards - Firewalls and anti-virus software protect networks from uninvited users and keep information secure.Wi-Fi Network Topologies  Peer-to-peer topology (Ad-hoc Mode)  AP-based topology (Infrastructure Mode)Peer-to-peer 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 Wi-Fi Network Works  A Wi-Fi hotspot is created by installing an access point to aninternetconnection.  Anaccesspointactsasabasestation.  When Wi-Fi 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  Wi-Fi 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

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