

I guess that’s what I haven’t figured out yet - it’s about 200’ and I don’t have 200’ of wire laying around. I’m thinking of making dummy terminations for each end of my cat6 cable and stripping each of the pairs and twisting them together so it works as a single conductor and using that to measure.
It’s pre terminated pure copper direct burial cat6 from Amazon. I don’t have access to a real tester, but my cisco switch has some built in test capability and I’m not sure I fully understand the results, but it’s assessment of the cable length is pretty close and, more importantly, it shows all the pairs are the same as each other. I think that if there was some damage to the cable, it’s unlikely that it would affect all the pairs in exactly the same way. I have other weird grounding issues - like 20V between neutral and ground, even though it’s a new house and they’re properly bonded at the service entry. I had a really old transformer on the street feeding the two buildings and the power company recently replaced it - I was disappointed when this didn’t resolve all my issues.