I've bought dozens of these over the years and didn't realize the power adapter wasn't included. But on the other hand, it will power any PoE device, even those that don't require 48 volts. Try connecting a 24v power supply to other POE injectors and in most cases they won't turn on. This one does. As for the rating. What is purity? I bought a PoE adapter, not pantyhose.
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