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DP83869HM: Gigabit aplication

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

Tool/software:

Hello,

we are designing the gigabit application and I wanted to better understand recemented circuit. In datasheet on figure 8-3 is showed how the circuit shall look like, But in the note A is written that the central tub voltage shall be connected to PHY if I get it right. So my question is if the central tab voltage shall be  available from PHY or just decoupling C is ok. 

I am asking because I made research I see that there are tow recemented circuit basically depending on the PHY / vendor......but I did not found anywhere why there is two variant for Ethernet communication (with CTV / without CTV)