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@vogelchr @whitequark @gsuberland Yep. We havent opened up the endpoints to confirm, but working theory is that DC jack and center taps are in fact tied together with no anti-backfeed diodes.

And switch C ties all the center taps together so it shorts out, while B has isolated taps.

Workaround: put a dumb passive PoE injector mid-span on the cable with "power out" facing the camera, but don't actually connect power to it. Just use it as a common mode DC block. (This keeps the link working at gigabit)