Just finished wiring up a new wall drop and did a routine TDR test on the switch to confirm everything was good. TDR showed an open on pair D right on the switch rack (https://imgur.com/qEWhabN). Looked at the patch cable, one of the brown wires looked a bit marginal so I re-crimped it. Still no go.
I spent a while looking around the rack jiggling things, inspected the punch-down connection on the patch panel, and everything looked good.
Then I had the bright idea to look at the switch port... https://imgur.com/4ImqSac. Welp.
On the plus side, this is going to a lab bench that had lots of very expensive 10/100 gear on it so I can just mark the wall drop "100M only" and not have it be too much of a problem. Still annoying though.
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