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I have rpi cmb4 and I want to power on rpi with using PoE. I don't know how should I do. I tried to just connect ethernet cable to rpi but rpi was still closed.
Is there any idea?
PoE runs at 48V, it has to be stepped down to 5V. RPI does not have circuitry for that.
You need either a PoE HAT or a PoE USB splitter.
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