Wireless Fidelity (WIFI)

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Wireless Fidelity (WIFI)

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Wireless Fidelity (WIFI)

  1. 1. Pertemuan 18 Jaringan LAN - Nirkabel Matakuliah : H0484/Jaringan Komputer Tahun : 2005 Versi : 1/0
  2. 2. Learning Outcomes <ul><li>Pada akhir pertemuan ini, diharapkan mahasiswa </li></ul><ul><li>akan mampu : </li></ul><ul><li>Menyediakan LAN -Nirkabel </li></ul>
  3. 3. Outline Materi <ul><li>Ad-Hoc </li></ul><ul><li>Infra strucutre </li></ul><ul><li>Standards </li></ul>
  4. 4. 802.11b Wireless LAN <ul><li>Use multiple frequencies in the 2.4GHz range </li></ul><ul><li>Utilise Direct Sequence Spread Spectrum (DSSS) technology </li></ul><ul><li>Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) </li></ul><ul><li>Wired Equivalent Privacy (WEP) </li></ul>
  5. 5. Channel Frequency <ul><li>Frequency range of DSSS is between 2.4 to 2.4835 GHz </li></ul><ul><li>No. of channels at different part of the world varies (S.E.A. : 13 channels) </li></ul><ul><li>Each channel bandwidth is approximately 20MHz </li></ul>
  6. 6. Channel Frequency 2400 2410 2420 2430 2440 2450 2460 2470 2480 2405 2415 2425 2435 2445 2455 2465 2475 Ch11 Ch6 Ch1 2400 2483.5 20MHz 20MHz 20MHz
  7. 7. Wireless LAN Specifications 802.11b+ 802.11b 802.11g 802.11a Data Transfer Rate Up to 22Mbps Up to 11Mbps Up to 54Mbps Up to 54Mbps Frequency 2.4GHz 2.4GHz 2.4GHz 5GHz Compatibiliy 802.11b 802.11g 802.11b 802.11a only
  8. 8. KOMPONEN AKSES <ul><ul><ul><li>Client (PCMCIA card) </li></ul></ul></ul><ul><ul><ul><li>External Antena </li></ul></ul></ul><ul><ul><ul><li>Access Points </li></ul></ul></ul><ul><ul><ul><ul><ul><li>Enterprise Access Point </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Residential Gateways </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Access Servers (Public Access) </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Outdoor Routers (Outdoor) </li></ul></ul></ul></ul></ul>
  9. 9. Two Modes in 802.11b <ul><li>Ad-Hoc Mode (also known as “peer-to-peer” mode) </li></ul>Screen Monitor II PC equipped with wireless LAN adapter Notebooks equipped with wireless LAN adapters
  10. 10. <ul><li>Infrastructure Mode </li></ul>Two Modes in 802.11b Screen Monitor II Screen Monitor II Wired File Server Wired Ethernet Network Gateway to Internet Internet Wired Computer with printer sharing Hardware Access Point Wireless Network PC equipped with wireless LAN adapter Notebooks equipped with wireless LAN adapters
  11. 11. APLIKASI OUTDOOR <ul><li>Biasanya mempunyai Central Outdoor Unit (Router) dan Remote Oudoor Unit (Router) </li></ul><ul><li>Tiap segment dapat melayani sampai misalnya 32 remote sites </li></ul><ul><li>Cakupan sampai to 15 km </li></ul><ul><li>Kecepatan 11Mbps, 3 channels </li></ul><ul><li>Mendukung indoor/outdoor connectivity </li></ul>
  12. 12. OUTDOOR POINT TO POINT
  13. 13. REPEATER POINT TO POINT
  14. 14. POINT TO MULTI POINT
  15. 15. POINT TO MOBILE POINT

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