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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?

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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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  • For CM4IO I would use 12V to get the full functionality of the IO board raspberrypi.org/products/compute-module-4-io-board
    – Dirk
    Mar 16 at 16:46
  • Actually I have trouble understanding because I am new to this business. Sorry for that. I mean, unlike normal raspberry, can I supply PoE for the raspberry pi cm4 io board without needing a PoE HAT? @Dirk
    – noobinmath
    Mar 16 at 20:16

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