The PoE device can detect non-standard, legacy PDs, which do not conform to the IEEE 802.3af standard, using a capacitance measurement. However, you must specifically enable the switch to detect these non-standard PDs; the default value for this detection method is disabled.
This configuration applies to the entire switch; you cannot configure the detection method per slot.
The legacy detection method is enabled.
The switch unsuccessfully attempted to discover the PD using the standard resistance measurement method.