Next step: I connected a 10mb shared hub to the switch, and plugged the empeg into that, along with a laptop so I could capture a trace of the messages. Bummer -- never fails with this setup. Just the presence of the 10mb hub, with the empeg connected to it, "fixes" the problem.
Right, that's been a long-known problem. The empeg isn't compatible with some switches, and daisy chaining into a plain 10mb hub fixes it. We don't know why. Maybe we can get to the bottom of the problem through your research?
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Tony Fabris