[SI-LIST] Switching diff pairs from tightly coupled to loosely coupled and back

Hi,

I'm re-designing a board initially designed by somebody else and I
noticed that on layer 1 the diff pairs are tightly coupled while on
layer 3 they are loosely coupled. (The stackup for the first 4 layers is
S/G/S/G and there are 2 microvias layers.)

So I'm wandering what will happen to my 5.0Gbps signals when the diff
pairs go form the layers 1 to the layer 3 and back. As this is on the 2
sides of the same gnd plane maybe the transition will go smoothly but I
would be interested by any references (papers, links) or feedback on the
subject.

Thanks,

Marc
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