The SG200-08 has no PSE capability. It can accept PoE from an upstream switch or injector, but it can't power other devices. If you connect an injector to the upstream switch and try to power the SG200-08 via port 1, it should come up as long as you can deliver 12V and 1A. I have heard of people using injectors up to 48V and not having any trouble, so 24V shouldn't be a problem. The nice thing about PoE is that power is not supplied unless it is requested by the downstream, and even then, only what the device requests... so you won't be running the risk of burning it out.
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