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The things you find when you go looking...
(lemmy.zip)
So that's why a 2 systems were getting crappy speeds. Yes, 2. It had been used only to split a single drop from another switch between two systems.
New drop, happy clients.
Some stuff here is museum material.
It's a 200' cable and the buildings each have their own connection to the power company. I suspect that the earth potential of the two buildings is quite different - I just have not figured out a way to measure it yet and not sure if there's anything I can do to fix it even if I do confirm it.
That shouldn't be a problem unless you're using grounded shielded cable, in which case you should make sure the shield ground is only connected at one end.