Duet 2 Ethernet questions
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@dc42 said in Duet 2 Ethernet questions:
Does the switch supply a small current until after the handshake, enough to provide power for the handshake but not enough to destroy a non-PoE device?
pretty much, it does a few pulses (not 48v) to detect a the impedance of a poe compliant device, it will not damage non-poe stuff.
you're right about the modes, pretty much all passive poe solutions will use mode B, compliant will negotiate, but still not damage a duet as it wouldn't get past the detection phase. a third mode is defined for 1000BaseT which basically has data and power on all pairs iirc.
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@bearer, thanks for the clarification.
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Just to be very clear, the passive PoE solutions will not attempt to detect a supported device, they just supply a constant voltage. But there are few switches of this type, more common with inline power injectors.
(Also people using passive PoE in their products ought be taken out back and, uhm, be dealt with)
((compliant devices will also have just the PoE PD circuitry powered until handshaking is complete and the host device receives power))
