Something I've never understood:
> The above figure shows a PoE injector with auto negotiation, a safety and compatibility feature that ensures power is delivered only when the connected device can accept it. Before supplying power, the injector initiates a handshake with the PD to detect its PoE capability and determine the appropriate power level.
If PoE requires negotiation, and the device requires PoE for power.. how does it perform the handshake without being powered/booted first?
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