Comprehensive Guide to Wireless LAN: Standards, Applications, and Infrastructure
This guide provides an in-depth look at Wireless Local Area Networks (WLANs), covering their market landscape, current standards such as IEEE 802.11, and practical applications for diverse environments. Readers will gain insights into major wireless organizations like the FCC and IEEE, exploring their roles and regulations in the WLAN ecosystem. The text also delves into radio frequency fundamentals, spread spectrum technologies, and the critical infrastructure that supports wireless communication, including antennas and accessories. Ideal for professionals and enthusiasts alike seeking to understand WLAN administration.
Comprehensive Guide to Wireless LAN: Standards, Applications, and Infrastructure
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Presentation Transcript
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
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
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
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
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
WLIF • Founded to assist with interoperability testing • Created “OpenAir”certification • Member funded • Now defunct
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)
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
Objectives • Describe the behavior of RF • Explain the variables involved with antennas and RF • Perform RF mathematics for building FCC compliant systems
Radio Frequency • What is RF? • RF Behaviors –Reflection –Refraction –Diffraction –Scattering –Absorption • Gain and Loss
Voltage Standing Wave Ratio (VSWR) • What is VSWR? • Causes of VSWR • Effects of VSWR –Decreased signal amplitude –Transmitter and amplifier failure
RF Math The Relationship of the 10’s and 3’s
RF Math Problem 1 Calculating the Equivalent Isotropic Radiated Power (EIRP)
RF Math Problem 2 Convert Decibels to Watts
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
FHSS vs. DSSS • Narrowband Interference • Cost • Rated Bandwidth
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
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
Antenna Mounts • Ceiling • Wall • Pillar • Ground plane • Mast • Articulating • Chimney mount • Tripod-mast
RF Antenna Installation/Configuration • Proper orientation • Precise alignment • Secure mounting • Avoid conductive areas • Prevent moisture • Avoid obstructions • Best coverage
RF Antenna Safety • Factory Manuals • Keep your distance from transmissions • Avoid metal obstructions • Consider Professional Installers • Avoid power lines • Use grounding rods
