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  1. 1. Wireless LANs Presented by: Jerome Thompson Mei-Lun Huang Liu-Yin Hu Kai-Wing Sum
  2. 2. Table of contents <ul><li>How wireless LAN works </li></ul><ul><li>Products </li></ul><ul><li>Benefits </li></ul><ul><li>Future </li></ul>
  3. 3. How it works: <ul><li>Wireless networks is networking devices to one another to transfer data, and communicate with each other. </li></ul><ul><li>Networking is done by nodes, and PCI cards. </li></ul>
  4. 4. Hub
  5. 5. Radio Frequency : <ul><li>  RF waves ranges from 2.4 to 2.48 GHz bandwidth. </li></ul><ul><li>  Short waves i.e. FM/AM radio, TV, cell phones… </li></ul>
  6. 6. Radio Frequency <ul><li>Frequency Hopping Spread Spectrum </li></ul><ul><ul><li>( FHSS) transmission hops from one </li></ul></ul><ul><ul><li>channel to another channel till one is free. </li></ul></ul><ul><ul><li>Divides the 2.4 GHz bandwidth </li></ul></ul><ul><li>Direct-Sequence Spread Spectrum. </li></ul><ul><ul><li>( DSSS ) is a transmission technology used in LAWN transmissions where a data signal at the sending station is combined with a higher data rate bit sequence </li></ul></ul>
  7. 7.       Infrared Transmission <ul><li>Shorter range than RF </li></ul><ul><li>More secure </li></ul><ul><li>Requires a line of sight </li></ul><ul><li>Interruption by sunlight </li></ul>
  8. 8. IEEE 802.11: <ul><li>IEEE 802.11 sets the standards for wireless networks </li></ul><ul><li>Architectures: two options in configuring a network: </li></ul>
  9. 9. Ad-Hoc <ul><li>1.      Ad-Hoc- constructing a network “on the fly” </li></ul><ul><li>No fix points </li></ul><ul><li>No structure </li></ul><ul><li>Communicates by nodes; all nodes can transmit to other nodes </li></ul><ul><li>One master computer/device while others are the slave. </li></ul>
  10. 10. Ad-Hoc
  11. 11. Infrastructure <ul><li>Fixed network access points with mobile nodes </li></ul><ul><li>Access points are connected to landlines to bridge other wireless nodes to wired nodes, similar to cellular networks. </li></ul>
  12. 12. Infrastructure
  13. 13. IEEE 802.11 Layers <ul><li>Physical (PHY) layer </li></ul><ul><ul><li>The PHY actually handles the transmission of data between nodes. </li></ul></ul>
  14. 14. IEEE 802.11 Layers <ul><li>Medium Access Control (MAC) layer. </li></ul><ul><ul><li>The MAC layer set protocols to maintain order when sharing of data. </li></ul></ul><ul><ul><li>CSMA/CA </li></ul></ul><ul><ul><li>RTS </li></ul></ul><ul><ul><li>CTS </li></ul></ul><ul><ul><li>CRC </li></ul></ul><ul><ul><li>ACK </li></ul></ul>
  15. 15. Wireless LAN Products <ul><li>PCMCIA </li></ul><ul><li>PCI Card </li></ul><ul><li>Access Point </li></ul><ul><li>Router </li></ul>
  16. 16. Application
  17. 17. Features <ul><li>IEEE 802.11b </li></ul><ul><li>Direct Sequence Spread Spectrum(DSSS) </li></ul><ul><li>11Mbps </li></ul>
  18. 18. Wireless LAN Products <ul><li>PCMCIA Wireless PC Card </li></ul><ul><li>Compaq WL110 </li></ul><ul><li>Buffalo WL-PCM-L11 </li></ul><ul><li>PCI Card </li></ul><ul><li>Compaq WL210 </li></ul><ul><li>Buffalo </li></ul><ul><li>Access Point (AP) </li></ul><ul><li>Compaq WL410 </li></ul><ul><li>D-Link DWL-900AP </li></ul><ul><li>Router </li></ul><ul><li>SparkLAN WX-5000 </li></ul>
  19. 19. PCMCIA Wireless PC Card
  20. 20. Compaq WL110 <ul><li>Used for enterprise, small or medium business, and home office </li></ul><ul><li>11 Mbps </li></ul><ul><li>Secure Internet Access </li></ul><ul><li>128 bit Wired Equivalent Privacy(WEP) encryption </li></ul>
  21. 21. Buffalo WL-PCM-L11 <ul><li>High speed wireless connection, up to 11 Mbps </li></ul><ul><li>Plug and Play installation </li></ul><ul><li>Integrated antenna </li></ul>
  22. 22. PCI Card
  23. 23. Compaq WL210 <ul><li>Extends wireless network to desktops, point of sale, and other non-portable devices </li></ul><ul><li>External antenna jack </li></ul>
  24. 24. Buffalo WLI-PCI-OP <ul><li>Let desktops can use PCMCIA Card </li></ul><ul><li>11 Mbps </li></ul>
  25. 25. Access Point (AP)
  26. 26. Compaq WL410 <ul><li>Extends the range of cabled Ethernet network, providing easy network access to mobile users and difficult to wire locations </li></ul><ul><li>128-bit Wired Equivalent Privacy (WEP) encryption </li></ul><ul><li>Investment protection </li></ul><ul><li>Doubling network capacity </li></ul><ul><li>Lower network management costs </li></ul>
  27. 27. D-Link DWL-900AP <ul><li>Point-to-point bridging capability </li></ul><ul><li>With a DHCP server, the DWL-900AP will automatically obtain an IP address. </li></ul><ul><li>128-bit WEP (Wired Equivalent Privacy) </li></ul><ul><li>a USB port is provided for flexibility in configuring the device </li></ul>
  28. 28. Router
  29. 29. Spark LAN WX-5000 <ul><li>Same function as wired network router </li></ul><ul><li>Printer Port </li></ul><ul><li>Firewall </li></ul>
  30. 30. The benefits of using wireless network · Mobility · Installation Speed and Simplicity · Installation flexibility · Reduced Cost –of –Ownership
  31. 31. Mobility <ul><ul><li>LAN systems can provide the user with access to information anywhere in their organization. This mobility supports productivity and service opportunities not possible with wired networks. </li></ul></ul>
  32. 32. Installation Speed and Simplicity <ul><li>Wireless LAN systems can be installed fast and easy and can eliminate the need to pull cable through walls and ceilings. </li></ul>
  33. 33. Installation flexibility <ul><li>Wireless technology allows the network to go where wire can’t go. </li></ul>
  34. 34. Reduced Cost –of –Ownership <ul><li>While the initial investment required for wireless LAN hardware can be higher than the cost of wired LAN, overall installation expenses and life-cycle costs can be significantly lower. Long-term cost benefits are greatest in dynamic environments requiring frequent moves and changes. </li></ul>
  35. 35. Wireless LAN in your industry <ul><li> Corporate: Corporate employees can take advantage of mobile networking for e-mail, file sharing, and web browsing regardless of where you are in the office or outside the building. </li></ul><ul><li> Education: Enable users with notebook computers to connect to the university network for collaborative class discussions and to the Internet for e-mail and web browsing. </li></ul><ul><li> Manufacturing & Warehouse: Link factory floor workstations and data collection devices to a company’s network. Improve inventory tracking and reduce the costs of physical inventory counts. </li></ul>
  36. 36. The Future of wireless LAN <ul><li>Many companies have invest </li></ul><ul><li>Wireless LAN market </li></ul><ul><li>Price come down </li></ul><ul><li>Small and Home business grow up fast </li></ul><ul><li>Home networking will be popular </li></ul>
  37. 37. Many companies have invest <ul><li>A lot of companies have begun to invest about the wireless networking, such as Intel , Microsoft , IBM etc. </li></ul><ul><li>Microsoft built wireless support into the successor to windows 9x, NT and later version. </li></ul>
  38. 38. Wireless LAN Market <ul><li>The wireless data rate, for instance, is a scorching fast 11 Mbps, up to 10 times faster than the most popular home networking products. </li></ul><ul><li>It is more fit on the most business, such as transfer data, communication and Net meeting. </li></ul>
  39. 39. Price come down <ul><li>When the supply of the wireless network device become greater than the demand, user can spend a low price and get more effective device. </li></ul>
  40. 40. Home and small business grow up fast <ul><li>When the price of the wireless LANs devices are going to be more user affordable, then small and home business wireless networking will become more popular. </li></ul>
  41. 41. Home networking increasing <ul><li>Market research firm Yankee Group predicts that wireless LANs will make up a quarter of home networks by 2003. </li></ul>
  42. 42. The End