Wireless Basics

  • Frequency Hopping Spread Spectrum (FHSS)
  • Direct Sequence Spread Spectrum (DSSS)
  • CSMA/CA
  • Wireless Access Points
    • Access Modes
      • Infrastructure WLAN
      • Stand-Alone
      • ad-hoc WLAN
  • Basic Service Set
  • Service Set ID
  • Authentication
    • Open System Authentication (OSA)
    • Shared Key Authentication (SKA)
  • Wired Equivalent Privacy

IEEE 802.11 Protocols

  • Wireless B - IEEE 802.11a
    • 2.4 GHz
    • 11 Mbps
    • DSSS Modulation
    • 20-MHz channel spacing
  • Wireless A - IEEE 802.11b
    • 5 GHz
    • 54 Mbps
    • Orthogonal Frequency Division Multiplexing (OFDM)
    • 22-MHz channel spacing
    • 25 Feet operational range
  • Wireless G - IEEE 802.11g
    • 2.4 GHz
    • 54 Mbps
    • DSSS Modulation
    • 20-MHz channel spacing
    • 22-MHz channel spacing in 802.11b compatability mode
  • Wireless N - IEEE 802.11n
    • 2.4 GHz, 5 GHz
    • 260/540 Mbps (w/ 4 transmitters in 20 and 40 MHz channel spacings)
    • Orthogonal Frequency Division Multiplexing (OFDM)
    • MIMO
    • 20 and 40 MHz channel spacing
  • IEEE 802.11i

 


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