How to enable Spectrum Analyzer and use the data for ePMP AC and AX RADIOs

Summary: This article explains the details related to enabling the spectrum analyzer and using the analyzer data to choose the best frequency.

Cause:

The ePMP devices are unlicensed and are usually used in co-existence with other vendors/ devices using the same frequency.

Spectrum analyzer is a handy tool that is inbuilt in an ePMP AC and AX devices that can be used, without disrupting the live traffic (In rare cases, it may cause slowness or link drop).

The step-by-step process to enable the spectrum analyzer and how to use the report to select the best channel is mentioned below:

To enable the spectrum analyzer: Configure >> Tools >> Spectrum Analyzer >> enable and save

1: Run the spectrum analyzer for 15 mins and it should populate the information for user reference:

You will get the data scanned by the analyzer, similar to the below image.

Note: You can choose different scanning modes: Light and Detailed:

Light Mode - only Management Frames will be captured for Interferer detection. Some Interferers may not be discovered. Scanning results may slightly vary from actual environmental conditions.
Detailed Mode - Management, Control, and Data Frames will be captured for Interferer detection. All Interferers will be discovered. Could cause performance degradation or even session drops.

2: How to use the data to select the best frequency.

  • : Select extreme low or High frequency.
  • : Run the spectrum analyzer for some time.
  • : You will get a list of all the available interferers.

The interference levels in the above sample are -39 and -66. This is sufficient to cause issues in this frequency.

: Try to find the clean frequency or least affected one, say we can choose 5030 as per the above scan result.

This will ensure that the link is working at its optimum and give the best performance.

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Why is the -39 from the Genexis WiFi in no way reflected in the SA graph above it ?

Why does the Cambium AP show up on the detailed interferer list but is nowhere to be found on the interferer graph above.

Why does what appears to be other ePMP AP’s (or some kind of APs) right next to the one detected at 5655 not show up on the interferer graph or list ?

Why is there absolutely no SA data after 5770 or between 5370 and 5450 ?

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