I have 3 different 3 volt units and will buy 2 more for another server room. They really get rid of the cable clutter. I haven't connected 8 devices to them and depending on the device I've found that power consumption is an issue. On one of them I had to reverse the polarity by cutting and connecting the wires. Seems like Polycom phones have a different polarity. In general I am quite satisfied.
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