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DP83822I: Class A and B for driver class

Genius 15690 points
Part Number: DP83822I

Hello,

 

My customer has an question for DP83822.
The datasheet says that there are 2 classes, class B and class A, for line driver class like the below on P75.

What is the difference between them?
Also could you tell me each merits and demerits? 

Regards,
Oba