[SI-LIST] How to place the AC coupling capacitor of the serdes?

Dear si-listers:
AC coupling per the PCI Express Base Specification Revision 1.0a, section 
4.3.1.2 dictates AC coupling to be placed as
close as practical to the transmitter buffer. 
We consider that the AC cap is used to ensure the DC bias levels of the 
transmitted signal do not adversely
affect the receiver,and most of time place it clsoe to the receiver side.Why 
the PCIe requires  to put it on the TX side?
Is it differ from different serdes interface?

 Thanks and Regards,

                    LIU Luping

   

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