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Hey Jeff, thanks for all that background info, it makes understanding the system easier in terms of sorting a cat5 cable issue.
For the ‘badly fitted connector’ scenario, I have a cable tester that just checks continuity across the 4 pairs. Is this adequate to find a fault or are we needing something a bit more involved to check a cable….. Say something that measures the impedance across the cable and fitted connectors?
My system currently works fine in this respect but I’m always aware that it’s possible to be on the limit without knowing, and then an extra long cable or other variant pushes your luck too far. And then it’s Game over!

R72 & IDR32