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Chapter 1 Introduction Wireless LAN Administration

Chapter 1 Introduction Wireless LAN Administration. Objectives. Describe the wireless LAN Market and the standards that govern the market Describe the appropriate applications of a wireless LAN and how wireless LANs should best be used

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Chapter 1 Introduction Wireless LAN Administration

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  1. Chapter 1IntroductionWireless LANAdministration

  2. Objectives • Describe the wireless LAN Market and the standards that govern the market • Describe the appropriate applications of a wireless LAN and how wireless LANs should best be used • Define the major wireless LAN organizations and the role each organization plays

  3. Wireless LAN Market Overview • Past, Present, Future of wireless LANs • Introduction to current standards –IEEE 802.11 –IEEE 802.11b –IEEE 802.11a –IEEE 802.11g

  4. Applications of a Wireless LAN • Deployed in an accessor distributionrole • Extending the network to remote areas within and outside of buildings • Low-cost building-to-building connectivity (replacing Telco) • “Last Mile”data delivery service (WISP) • Modest speed access method • Allows flexibility for mobile users (roaming) • SOHO use • CoS & QoS are available only with specialized hardware • Movable network (mobile office, hospital, classroom) • Metropolitan Area Wireless Networks

  5. FCC • Makes the regulations regarding RF frequency use & power output limits for the United States • Designates ISM & UNII band usage parameters such as: –Frequency bands used –Power output limits –License-free use of the frequency bands –Type of RF transmissions (spread spectrum technology) • www.fcc.gov

  6. IEEE • Makes the industry standards regarding WLANs in the United States • Created 802.11 and subsequent Wireless LAN standards • Creates the standards within the confines of FCC regulations • www.ieee.org

  7. WLIF • Founded to assist with interoperability testing • Created “OpenAir”certification • Member funded • Now defunct

  8. The Wi-Fi Alliance • Creator of the Wi-FiTMcertification for wireless LAN hardware interoperability • Wi-Fi certification for 802.11b and 802.11a • www.wi-fi.com • WPA (Wi-Fi Protected Access)

  9. WLANA •Promotes wireless LAN industry education and awareness •Non-profit organization relying on affiliate and sponsor members to support it and to drive the industry forward •www.wlana.com

  10. Chapter 2Radio FrequencyFundamentals

  11. Objectives • Describe the behavior of RF • Explain the variables involved with antennas and RF • Perform RF mathematics for building FCC compliant systems

  12. Radio Frequency • What is RF? • RF Behaviors –Reflection –Refraction –Diffraction –Scattering –Absorption • Gain and Loss

  13. Voltage Standing Wave Ratio (VSWR) • What is VSWR? • Causes of VSWR • Effects of VSWR –Decreased signal amplitude –Transmitter and amplifier failure

  14. Antenas

  15. RF Math The Relationship of the 10’s and 3’s

  16. Relationship of 10’s & 3’s-

  17. RF Math Problem 1 Calculating the Equivalent Isotropic Radiated Power (EIRP)

  18. RF Math Problem 2 Convert Decibels to Watts

  19. Chapter 3Spread SpectrumTechnologies

  20. Objectives Upon completion of this chapter you will be able to: • Define spread spectrum technologies and how they are used • Describe modulation and the different data rates • Explain and compare FHSS and DSSS • List the factors that impact signal throughput and range

  21. FHSS vs. DSSS • Narrowband Interference • Cost • Rated Bandwidth

  22. Chapter 4Wireless LANInfrastructure Devices

  23. Objectives Upon completion of this chapter you will be able to: • Configure, install, and manage wireless infrastructure devices • Configure, install, and manage wireless client devices • Configure, install, and manage the different types of wireless gateways

  24. Access Point

  25. Access Point in “Root Mode”

  26. Access Point in “Repeater Mode”

  27. Access Point in “Bridge Mode”

  28. Access Point Mounts

  29. Wireless Bridge

  30. Wireless Workgroup Bridges

  31. PCMCIA Cards and Converters

  32. Wireless Adapters

  33. Using Client Devices

  34. Wireless Residential Gateways

  35. Using Residential Wireless Gateways

  36. Enterprise Wireless Gateway

  37. Using Enterprise Wireless Gateways

  38. Chapter 5Antennas and Accessories

  39. Objectives Upon completion of this chapter you will be able to: • Explain the types of wireless LAN antennas and how/when to use them • Describe the various wireless LAN accessories and where they are used

  40. Dipole/Omni Antenna

  41. Semi-directional Antennas

  42. Highly-directional Dish Antennas

  43. Highly-directional Grid Antennas

  44. Antenna Mounts • Ceiling • Wall • Pillar • Ground plane • Mast • Articulating • Chimney mount • Tripod-mast

  45. Antenna Mounts

  46. RF Antenna Installation/Configuration • Proper orientation • Precise alignment • Secure mounting • Avoid conductive areas • Prevent moisture • Avoid obstructions • Best coverage

  47. RF Antenna Safety • Factory Manuals • Keep your distance from transmissions • Avoid metal obstructions • Consider Professional Installers • Avoid power lines • Use grounding rods

  48. Power over Ethernet Devices (PoE)

  49. Using PoE Devices

  50. RF Amplifiers

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