InetDaemon.Com

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