[SI-LIST] Better choice for AC coupling

Hi.all
we often use AC coupling circuit for differential signal especially different 
level type.

Now I'm designing a system interface as following:
driver card-------backplane---------receiver card

No doubt ,we need at least one capacitor series in the path to realize 
interconnect.
Some vendor also recommend using two capacitors as following:

driver card----||---backplane-----||----receiver card

which is better to use one or two capacitors?
What's the priority for each case? 

for above system ,when use one capacitor,where is better to place?

By the way,The simulation result at receiver card is no difference when we 
place one or two capacitor series in the circuit.
  

Thanks.


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