10. Wireless Frequencies

Part 10 of Computer Networking Fundamentals: Wireless Radio Frequencies

Wireless Radio Frequencies

At the end of this episode, I will be able to:

1. Compare and contrast wireless frequencies used in wireless local area networks.

Learner Objective: Compare and contrast wireless frequencies used in wireless local area networks

Description: In this episode, the learner will identify the two frequency ranges used in wireless local area networks (WLAN).

• Introduction to Network Infrastructure
  • Wireless Frequencies
    • Industrial, Scientific and Medical (ISM) band
      • 2.4 Ghz
        • Channels
          • 13 channels (11 available in the US)
          • Each channel is 5 Mhz apart
          • 22 MHz spacing is required between channels to reduce interference
          • 3 non-overlapping channels (22 MHz spacing)
            • Channel 1, channel 2, channel 3
          • 802.11n allows for channel bonding
            • 20 MHz and 40 Mhz
    • Unlicensed Nation Information Infrastructure (U-NII) band
      • 5 Ghz
        • Channels
          • 25 channels
          • All channels are 20 Mhz wide and non-overlapping (unless bonded)
        • The 5 GHz range allows for channel bonding
          • 20 MHz, 40 MHz, 80 MHz and 160 MHz