why need 54.5-57V not 48V input for POE++
what's the Ilim for POE++
Please clarify what you are referring to with PoE++. The terms PoE, PoE+ and PoE++ are generic and do not specifically apply to a standard. PoE++ is typically used as a term for PoE power levels higher than IEEE 802.3at Type 2 power (25.5W). Linear Technology's proprietary LTPoE++ is an example which provides power levels of 38.7W, 52.7W, 70W and 90W at the PD input.
1) Increasing the minimum voltage requirements is one way to increases the power delivered to the PD.
2) What are the power levels that you are asking the Ilim on?
1) So,I can believe that the minimum voltage requirements only affect the power for PD but not the function of POE?
And there is another question.
The PHY of PD is always damaged during hot plug of the network cable,though with much protection. Have you solutions?