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Chapter 4

Chapter 4. Wireless LAN Technologies and Products. Wireless LAN Products. Choosing a WLAN. What are the applications? Is mobility required? What level of performance is acceptable? Will infrared satisfy the needs? To what backbone networks do we need to connect?

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Chapter 4

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  1. Chapter 4 Wireless LAN Technologies and Products Prof. Huei-Wen Ferng

  2. Wireless LAN Products Prof. Huei-Wen Ferng

  3. Choosing a WLAN • What are the applications? Is mobility required? • What level of performance is acceptable? • Will infrared satisfy the needs? • To what backbone networks do we need to connect? • With what network OS do we need to work? • Is it secure? • How easy is it to install? To use? To manage? • How much does it cost? ($500) Prof. Huei-Wen Ferng

  4. Current Applications • Wire replacement applications • Mobile computing applications Prof. Huei-Wen Ferng

  5. Prof. Huei-Wen Ferng

  6. Lucent WaveLAN Prof. Huei-Wen Ferng

  7. Product Line Prof. Huei-Wen Ferng

  8. Network Topology Prof. Huei-Wen Ferng

  9. Components of AP • A wireless LAN adaptor to communicate with the wireless nodes • A wired adaptor to communicate over the backbone • MAC layer bridging software to filter traffic from the backbone to the wireless subnet Prof. Huei-Wen Ferng

  10. The radio 902-928 MHz ISM band 2.4-2.483 GHz ISM band 250 mw power output in 900 MHz band, 100 mw in the 2.4 GHz band MAC CSMA/CA Modulation DSSS DQPSK Protocols supported Novell NetWare 2.x and 3.x TCP/IP LAN manger Windows for workgroups Banyan VINES System Engineering Spec. Prof. Huei-Wen Ferng

  11. AP’s Functions • MAC layer transparent bridge (IEEE 802.1D) • Filtering/forwarding • Automatic learning and aging • Spanning tree algorithm • SNMP management • Radio path diagnostics • Access control • Net ID Prof. Huei-Wen Ferng

  12. Supported PHY Types of Ethernet • 10BaseT • Twisted pair Ethernet • 10Base2 • Thin wire Ethernet • 10Base5 • Thick wire Ethernet Prof. Huei-Wen Ferng

  13. DEC Prof. Huei-Wen Ferng

  14. Product Line Prof. Huei-Wen Ferng

  15. Protocols Supported • Pathworks V4.1 • Novell NetWare 2.x and 3.x • TCP/IP • LAN manager • Windows for workgroups • Banyan VINES Prof. Huei-Wen Ferng

  16. Products in the World Prof. Huei-Wen Ferng

  17. Products • DECtransporter for the MS-DOS/MS-Windows • A TCP/IP package • Enables cellular connection with appropriate modem, or a wired connection with appropriate modem • DECtransporter for OpenVMS VAX • A TCP/IP to packet radio network gateway • Enables connection to a private network over a public packet radio network such as Mobitex or ARDIS Prof. Huei-Wen Ferng

  18. Remote Connectivity Configuration Prof. Huei-Wen Ferng

  19. Solectek AIRLAN Prof. Huei-Wen Ferng

  20. Protocols Supported Prof. Huei-Wen Ferng

  21. Proxim RangeLAN 2 Prof. Huei-Wen Ferng

  22. Product Line Prof. Huei-Wen Ferng

  23. Network Topology Prof. Huei-Wen Ferng

  24. System Technology • FHSS • 2.4-2.483 GHz ISM band • 15 independent channels • CSMA/CA • 100 mw transmitted power • GaAs semiconductor • Power from computer’s internal battery Prof. Huei-Wen Ferng

  25. AP’s Capabilities • MAC layer bridge • Spanning tree protocol • Roaming from one bridge to another • Transparent to all Ethernets • SNMP agent provided • Diverse protocols supported • Novell NetWare 2.x, 3.x, 4.x, Lite • LAN manager • Windows for Workgroups Prof. Huei-Wen Ferng

  26. ISA Equipment • Interface card • Antenna • Software • Manual Prof. Huei-Wen Ferng

  27. Hardware Confirm default setting on card Install card in computer Screw antenna onto connector in back of card Software Copy configured IPX.COM driver to hard disk Load the IPX driver and DOS shell, NETX Copy the LOGIN.EXE file Installation Prof. Huei-Wen Ferng

  28. Xircom Netwave Prof. Huei-Wen Ferng

  29. Product Line Prof. Huei-Wen Ferng

  30. Technology • FHSS • 50 mw power output • 2.4-2.483 GHz ISM band • Hop every 0.1s • Synchronized system Prof. Huei-Wen Ferng

  31. Network Topology Prof. Huei-Wen Ferng

  32. Two Kinds of Ad Hoc Nets • Public hoc networks • Anyone in range can join a public ad hoc network • Named ad hoc networks • One station must start a named network • Other stations join if they specify the name • Optional encryption is available Prof. Huei-Wen Ferng

  33. IBM Wireless LAN Prof. Huei-Wen Ferng

  34. Technology • FHSS in the 2.4 GHz band • 100 mw power output • Antenna receive polarization diversity • TDMA MAC layer (FCFS) • Ethernet and Token Ring compatibility • SNMP agent Prof. Huei-Wen Ferng

  35. Administration Function • Authentication and privacy • Users are registered with WNA (wireless network administrator) and provided secret keys • Registered stations are authenticated by AP • Optional encryption is available • Interference management through change of hopping pattern Prof. Huei-Wen Ferng

  36. Motorola Altair Prof. Huei-Wen Ferng

  37. Technology • Not SS • In the 18 GHz band • Low power- 25 mw • Comprised of a control module (CM) and a user module (UM) • 8x11.5x3 inches in size • Antenna internal to module • Packaging similar for both modules Prof. Huei-Wen Ferng

  38. Network Topology Prof. Huei-Wen Ferng

  39. Windata Prof. Huei-Wen Ferng

  40. Product Line Prof. Huei-Wen Ferng

  41. The Hub Functions • Connectivity of transceivers • Synchronization • Access security • Power control • Network management Prof. Huei-Wen Ferng

  42. SNMP Functions • Enabling and disabling transceivers • Adding and deleting access to stations • Monitoring performance • Checking status of radio link Prof. Huei-Wen Ferng

  43. Network Topology Prof. Huei-Wen Ferng

  44. RadioLAN Prof. Huei-Wen Ferng

  45. Product Line • ISA card • Parallel port version • RadioLAN/10 Access Unit • Radio transceiver • Base station Prof. Huei-Wen Ferng

  46. OS and Driver Support Prof. Huei-Wen Ferng

  47. Photonics Prof. Huei-Wen Ferng

  48. Product Line (for PC) • PCMCIA II card • ISA card • Collaborative parallel option • AP • External transceiver Prof. Huei-Wen Ferng

  49. IR Transceiver Prof. Huei-Wen Ferng

  50. Diffuse IR Prof. Huei-Wen Ferng

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