0

As I understand IEEE PoE standards, the PSE detects PoE capability of the connected device (PD) by measuring resistance on certain pairs and then negotiates its PoE requirements.

Questions:

  1. Do passive PoE PSE perform the measurement before outputting power?
  2. Is there any PoE injector or midspan PSE that does so?
  3. Is there a risk of damaging equipment when connecting a non-PoE device down the line of passive PoE injector? Do Ethernet controllers include any protection against such damage? (thinking laptop, basic switch...)
0

The definition of "passive" PoE is that the power supply doesn't try to negotiate or determine anything. That is what differentiates it from "active" - i.e. standard - PoE.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.