If you need power for just one or two devices, instead of a PoE Switch, you can use a single 'PoE injector to add PoE to one Ethernet cable.
Compared to a larger PoE switch, a PoE injector is more economonical if you need only a small number of PoE devices in a particular location (break even on cost is probably about 4 ports, though there is also a neatness factor of usin a switch).
A PoE injector is mains powered and inserts PoE into the Ethernet cable.
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