Question How to use a new cable tester?

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Can you tell me more about this. This is something for me to look at that I've never heard before.
Non-UniFI switches confuse the network management app. If you are using the topology view to determine the wireless uplink, then the management app may be misleading you. If you look at the UniFI devices view, what does the uplink column for the APs show?
With non-UniFI switches, it is quite possible you have no connectivity issue, but the management app is not able to correctly interpret your connectivity.