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basics abt wifi technology...........

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  1. 1. Prepared By: Jaydeep Palekar 09CE062 U. & P. U. Patel Department of Computer Engineering Charotar Institute of Technology Charotar University Of Science & Technology
  2. 3. What is Wi-Fi? <ul><li>Wi-Fi, or Wireless Fidelity, is freedom: it allows a person to connect to the Internet from your couch at home, a bed in a hotel room or a conference room at work without wires. </li></ul><ul><li>Wi-Fi is a wireless technology. Wi-Fi enabled computers send and receive data indoors and out; anywhere within the range of a base station. </li></ul><ul><li>Its just as fast as a cable modem connection. </li></ul><ul><li>Allows you to access the Internet while on the move ; you can remain online while moving from one area to another, without a disconnection or loss in coverage. </li></ul>
  3. 4. Sample WiFi Illustration
  4. 5. Wi-Fi Standards <ul><li>Standard Speed Freq band Notes </li></ul><ul><li>802.11 2 Mbps 2.4 GHz (1997) </li></ul><ul><li>802.11a 54 Mbps 5 GHz (1999) </li></ul><ul><li>802.11b 11 Mbps 2.4 GHz </li></ul><ul><li>802.11g 54 Mbps 2.4 GHz </li></ul>
  5. 6. HotSpots <ul><li>What is a HotSpot? </li></ul><ul><li>A HotSpot is a geographic area that has a readily accessible wireless network. </li></ul><ul><li>HotSpots are equipped with a Broadband Internet connection, and one or more Access Points that allow users to access the Internet wirelessly. </li></ul><ul><li>HotSpots can be setup in any public location that can support an Internet connection. All the locations discussed below are examples of HotSpots. </li></ul>
  6. 7. What are the good places to install WiFi? <ul><li>Basically, any location which caters to business users, and where people with laptops are likely to make frequent visits is an ideal choice to install WiFi. </li></ul><ul><li>Airports </li></ul><ul><li>Hotels & Resorts </li></ul><ul><li>Restaurants </li></ul><ul><li>Coffee Shops </li></ul><ul><li>Bookstores </li></ul><ul><li>Shopping Malls </li></ul>
  7. 8. Typical Wi-Fi Users <ul><li>Now that we know about WiFi, who are the likely users of WiFi services? </li></ul><ul><li>Frequent Travelers </li></ul><ul><li>Businessmen and Corporate Managers </li></ul><ul><li>Scientists & Doctors </li></ul><ul><li>Students and Academicians </li></ul><ul><li>Administrators & Technocrats who participate in Seminars & Conferences </li></ul><ul><li>Just about anybody with a laptop </li></ul>
  8. 9. Components required for WiFi <ul><li>A PC, laptop or PDA, running Windows 98 or above. </li></ul><ul><li>A wireless PCMCIA card, or a wireless adapter. Now a days all the latest LAPTOPS are coming with in built CENTRINO </li></ul><ul><li>A Network Interface Card (optional) - Only if a LAN connection is required) </li></ul><ul><li>An Access Point - essentially a compact radio transmitter with an antenna that connects to a wired connection, such as an Ethernet, DSL, or Cable Network. </li></ul><ul><li>A valid internet connection. </li></ul>
  9. 10. PCMCIA wireless card <ul><li>Used For Portables: </li></ul>
  10. 11. PCI and USB adapters <ul><li>Used For Desktops: </li></ul>PCI adapter (inside) USB adapter (outside)
  11. 12. Components required – for a larger environment <ul><li>Multiple Access Points - To provide overlapping coverage throughout a site. Access points can be installed almost anywhere. </li></ul><ul><li>Network switch - A device that joins multiple computers together. A set of Access Points can be connected to a single network switch. </li></ul><ul><li>Wireless LAN bridge (optional) – A wireless LAN workgroup bridge enables connection between two different hotspot networks. </li></ul>
  12. 13. Wireless network design <ul><ul><li>Point-to-Point </li></ul></ul><ul><ul><li>Point-to-Multipoint </li></ul></ul><ul><ul><li>Multipoint-to-Multipoint </li></ul></ul><ul><ul><li>Any wireless network can be thought of as a combination of one or more of these types of connections: </li></ul></ul>
  13. 14. Point to Point The simplest connection is the point-to-point link. These links can be used to extend a network over great distances.
  14. 15. Point to Multipoint When more than one computer communicates with a central point, this is a point-to-multipoint network.
  15. 16. Multipoint to Multipoint When any node of a network may communicate with any other, this is a multipoint-to-multipoint network (also known as an ad-hoc or mesh network)
  16. 17. IEEE <ul><li>In 1997, the Institute of Electrical and Electronic Engineers (IEEE) drafted the 802.11 standard for wireless local area networking. </li></ul><ul><li>In 1999, networking hardware companies accepted the standard and began manufacturing products using the 802.11b protocol which operated in the 2.4 GHz range and was capable of transmitting at speeds of 11 Mbps. </li></ul><ul><li>The 802.11a protocol was also released in 1999, operating at 5.8 GHz with transmissions speeds of 54 Mbps, but its cost was prohibitively high. </li></ul>
  17. 18. IEEE Wireless Standards 5.725 - 5.850 GHz 2.4 – 2.4835 GHz 2.4 – 2.4835 GHz Frequency Range Large business concerned with security Larger networks, small business Entry level and home networks Potential user 802.11a 802.11b, 802.11g 802.11b, 802.11g Natively Compatible 8 3 3 Discrete Channels 152 bit WEP 256 bit AES 128 bit WEP 128 bit WEP Max Encryption 54 MBPS 54 MBPS 11 MBPS Max Speed 802.11a 802.11g 802.11b Wireless Standard
  18. 19. ADVANTAGES <ul><li>So why should you consider using a wireless network? </li></ul><ul><li>More than simply a fun new gadget for tech-heads to play with, there are actually many advantages to having a WiFi network. </li></ul><ul><li>For example, </li></ul><ul><li>A home user may find it much more convenient to use his or her laptop computer in the bedroom late at night and then move it to the den during the day. </li></ul><ul><li>A corporate user may find it very beneficial to have the freedom to work at one desk and then move to another without having to deal with networking cables. </li></ul><ul><li>A speaker will find it very useful to simply bring their laptop to the podium and give a presentation and not have to make sure the network is set up in that particular room, deal with the cables, etc. </li></ul><ul><li>Another main advantage is the simplicity of setting up a network. </li></ul><ul><li>Instead of having to worry about wiring each individual desk or office to the main server room, worry about which port goes where and which ports are active, you can simply enable the access point and give the configuration to any new user that may need access to the network. </li></ul>
  19. 20. Question & Queries????...... ……… If any
  20. 21. THANK YOU!!!