SLVSF02D March 2019 – May 2020 TPS23881
The requested class is the classification the PSE measures during mutual identification prior to turnon, whereas the assigned class is the classification level the channel was powered on with based on the power allocation setting in register 0x29h. In most cases where the power allocation equals or exceeds the requested class, the requested and assigned classes will be the same. However, in the case of power demotion, these values will differ.
For example: If a Class 8 PD is connected to a 60 W (Class 6) limited PSE port, the requested class reports "Class 8", while the assigned class reports "Class 6".
The requested classification results are available in registers 0x0C-0F
The assigned classification results are available in registers 0x4C-4F
There is no Assigned Class assigned for ports/channels powered out of Manual/Diagnostic mode.