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The POE standard is 48 volts DC, but unfortunately some manufacturers make proprietary equipment that sends 12 or even 5 volts DC over ethernet, and they sometimes label those products POE as well. You'll also see passive adapters you can plug any arbitrary power supply into sometimes labeled as...

A standard POE device, the working voltage is 48V, and complies with the IEEE802.3 af/at standard. We looked up your product (I41CC ), it is not a standard POE device, the working voltage is 12V, they are called SPOE. It's an outdated technology,