FAQ: How to use PoEz when PoE polarity is 12-, 36 +, 45 + and 78 - on IEEE 802.3bt PSE?
In rare cases, the current and power of Mode A (12, 36) are zero; Mode B (45, 78) have a value or the current and power of Mode A (12, 36) have value; Mode B (45, 78) is zero, which indicates that the polarity of PSE is designed to be a rare combination of 12-, 36+, 45+, 78-. In this instance, it is necessary to switch the direction of PSE and PD connections to obtain the values of both Mode A and B.