Greg Hill wrote:
officially, a POE capable switch/etc is supposed to do a discovery routine to detect, when a device is plugged into it, whether that device requires POE. Right? And the single-port POE injectors are usually nothing more than two RJ45 packs with a dc power connector, right? That could be the difference in price there: the detection circuitry. Or am I way off?
No, even the single-port injectors have to have that circuitry, I believe. Otherwise power on the extra pins would be live all the time, which could be damaging to any non-PoE equipment you plugged in there. Also, the PoE device itself wants to negotiate its power usage with the power supplier, and if the injector didn't respond I don't know if the PoE device would ever come up.
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