Originally Posted By: Dignan
when plugged directly into the end of the 200' run, I get around 18/5, which I figured was reasonable given the distance, is that correct? Or should it still be 30/5 at that point?

It should still be 30/5, or close. You definitely shouldn't see a dramatic dropoff. That, combined with the fact that putting S2 right next to S1 works fine, points to that cable being bad. Can you run a new cable? Maybe just along the hallway temporarily to see if it helps matters?
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Bitt Faulk