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Understanding Wireless LAN: Technology, Topology, Cost, and Customer Considerations, Slides of Computer Networks

An in-depth exploration of wireless lan, its technology, topology, cost-benefit analysis, and customer considerations. Learn about the differences between wired and wireless lan, the role of access points and adapters, and the various wireless technologies like spread spectrum and frequency-hopping. Discover real-world applications and examples, and understand the importance of scalability and roaming in wireless networks.

Typology: Slides

2013/2014

Uploaded on 01/29/2014

jamil
jamil 🇮🇳

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WIRELESS LAN
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Download Understanding Wireless LAN: Technology, Topology, Cost, and Customer Considerations and more Slides Computer Networks in PDF only on Docsity!

WIRELESS LAN

WIRELESS LAN

WIRLESS LOCAL AREA NETWORK

INTRODUCTION

  • Data communications system
  • Alternates wired LAN
  • Transmits and receives data over the air
  • Minimize the need for wired connections
  • Become more popular in general-purpose

alternative of business customers.

  • Benefited several industries in productivity and

mobility

WHY WIRELESS?

Advantages:

  • MOBILITY
  • INSTALLATION
  • COST
  • SCALABILITY

INSTALLATION

  • Fast and easy
  • No cable needed
  • No frustration with wiring
  • Go where wires cannot go

COST

  • Short run
    • Initial investment is higher than wired LAN
  • Long run
    • Long-term costs is essentially lower than wired LAN
    • Long-term cost and benefits are very important in dynamic and ever- changing business environments

IN THE REAL WORLD

  • Not a replacement for the wired infrastructure
  • Great complement to what currently exists
  • Examples
    • Doctors and nurses
      • more productive in delivering patients’ information and status instantly
    • Student
      • access the Internet to consult the catalog of the Library of Congress
    • Network managers
      • provide backup for mission-critical applications

HOW IT WORKS

  • Use electromagnetic airwaves to communicate

information

  • Data imposed on radio carrier (radio wave)
  • RF electromagnetic wave can easily pass through ordinary wall, it needs to implement with heavy concrete or metal screening.

WIRELESS TECHNOLOGY

  • Satellite-Based System
    • Geosynchronous Earth Orbiting (GEO)
    • Low Earth Orbiting (LEO)
  • Land-Based Network Access System
    • Wireless WAN
    • Wireless LAN

GEO SATELLITES

  • Circle the earth from a height of 22,300 miles
  • 3 satellites can be used to provide worldwide coverage
  • used for:
    • television broadcasts, long distance telecommunications, and various science and military applications

WIRELESS WAN

  • Provide nationwide or citywide coverage
  • Example: Ricochet Micro-Cell

Source: http://dcs.umd.edu

Coverage in Washington

D.C., San Francisco, and

Seattle

WIRELESS LAN

  • Wireless LAN Topology
    • 2 main components
      • Access Points
      • Adapters
    • Roaming
  • Wireless LAN Technology
    • Types
    • Standard
    • Configuration

ADAPTERS

  • Users used wireless-LAN adapters to connect to access points
  • Implemented as :
    • PC cards in notebook computers
    • ISA or PCI cards in desktop computers
    • Integrated within hand-held computers

ROAMING

  • Each access point can provide between 50,000 to 250,000 square feet of coverage
  • Example: Hospital Environment

Source: http://dcs.umd.edu