Referencing Wi-Fi Channel Numbers Correctly

Wide channel numbering changed with 802.11ac:

• 802.11n Channels (the "old" way)


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  • One 20 MHz primary channel, with a channel extension above or below
  
  
  • 40 MHz Example: Channel 36, +1
  
  
  • 40 MHz Example: Channel 40, -1
  
  
  • 40 MHz Example: Channel 36+40
  
  
  • This terminology should no longer be used
    
    
    
  
  
  
  


• 802.11ac Channels (the "new" way)


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  • Reference the center channel frequency for the entire 40/80/160 MHz wide channel
  
  
  • Designate one 20 MHz portion of the wide channel as the Primary 20 MHz
  
  
  • 40 MHz Example: Channel 38 with Primary 20 MHz channel 36
  
  
  • 80 MHz Example: Channel 155 with Primary 20 MHz channel 149
  
  
  • 160 MHz Example: Channel 50 with Primary 20 MHz channel 44
  
  
  
  

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