Hello All,
I have a peculiar issue with an ePMP1000 AP that I hope someone might be able to help with.
It is displaying its DFS Status as "ISM at Alternate Channel" on the System Summary screen.
From the Cambium User guide, the status message is described as "In-Service Monitoring at Alternative Channel: The radio has detected a radar pulse and has moved operation to a frequency configured in DFS Alternative Frequency Carrier 1 or DFS Alternative Frequency Carrier 2."
However the AP has not switched to its 1st or 2nd alternate frequencies that are configured. The operating frequency is still the primary frequency.
The AP has not displayed any RADAR (DFS) detections either in System Statistics (Monitor-->Performance).
The AP has v2.4.1 firmware and the primary frequency has a bandwidth of 40MHz and the alternate frequencies configured have a bandwidth of 20 MHz.
I have raised a case with Cambium technical support and have been advised that the AP could be partially detecting interference and but may not be automatically switching to the alternate frequency because of the fact that the primary channel has a 40 MHz bandwidth and the alternate frequencies have 20MHz bandwidth.
Is this a plausible reason for the behaviour? It doesn't explain however why the AP has not detected/reported any DFS events?
Also, although detections are classed as RADAR detections, the Cambium support guy stated that the AP will "treat any strong energy received on that channel as RADAR signal".
Is this the case that any interference on the channel is considered a RADAR signal and not just specific RADAR pulses?
This might be a red-herring but one of the SM's connected to the AP has reported DFS detections and has been having intermittent connection issues but none of the other SM's attached to the AP have any issues, including SM's adjacent to the problem SM, none have detected DFS events and all have good signal strengths and SNR's.
Would the AP report a local interference issue for just a single SM in this way?
Appreciate any thoughts and comments on the above.
Best Regards,