submitted 4 days ago by Donatello@lemmy.ml to c/networking@sh.itjust.works

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Hi,

I have a IP camera that have two power input

a DC 12V and PoE

I've lost the 12V power supply.

So I'm considering to power it trough a simple PoE injector like those

I believe those do not come with a 802.3af negotiation protocol (Not sure) so if those injector directly inject the voltage. (Here 48v) will it work ?

Did you already tried ?

Sorry I know it's not "totally" network related but if you know where I can post I'm all ears.

Thanks.

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[-] CondorWonder@lemmy.ca 1 points 4 hours ago

There’s your answer: you need an active PoE injector that follows 802.3af. None of the ones you pictured are the correct ones, they are passive not active and worst case can damage your device.

The difference is the active injector and the device communicate to determine how much power to provide, where the passive injectors just whack the device with their rated power. The device shouldn’t work without negotiation (per the spec).

this post was submitted on 06 Oct 2025

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