Monday, August 2, 2010


I know this topic was beat to death a few months ago when it actually launched, but I thought I'd take a moment or two and gather my notes on the technology - the pros/cons and hidden caveats.

The 3500 AP cannot influence the 1250 or 1140 to change its channel, the 3500 can only influence other 3500s to react to the interference 'seen' by a 3500.

APs must be within 150 feet of each other for the MSE to use the x/y position of APs located on the WCS maps to establish the RF proximity of interfering devices.  There is also no guarantee of location accuracy when tracking sources of interference.

Clean air APs in local mode only watch the channel they're configured to serve clients on, and spectrum event driven RRM can be triggered only by clean air APs in local mode.

Proper licensing is needed in order to track the location of interference sources.

Information passed from the AP to the WLC is minimal, no off platform calculations are performed, it all happens on the AP.

The AP manages air quality (AQ) data averaging period through settings on the WLC for each clean air AP.  Defaults to a 15 minute average (up to one hour).  AP sensorD reports AQ info every 15 seconds to the AP IOS.

  • normal updates - every 15 minutes
  • rapid updates - every 30 seconds

Rapid update mode on a given radio interface pollutes the overall average as normal averaging is suspended while rapid update mode is active.

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