DP83TC811R-Q1: design questions

Part Number: DP83TC811R-Q1

Hi team,

My customer is studying Ethernet PHY solution and they have some questions need us to clarify.

1. What's difference between Q-grade and non-Q grade PHY solution, please base on specification and electrical characteristic to advise.

2. Can both grade devices be compatible each other or not?

3. Do we have comparison table between Q and non-Q device?

4. Does Ethernet PHY support power on Cable?

Thanks