Design example for commercial high speed pcb

[yefj]

Hello ,Is there a PCB example which is routing differential signal over many layers.where there could be many differential ports in between then.
Is there such real life example I could try to do EM simulation from it?
Thanks.

 

[berkeman]

Hello ,Is there a PCB example which is routing differential signal over many layers.where there could be many differential ports in between then.

I believe that @Baluncore and I have both said that this is a bad practice, so there are probably very few examples of it. You really need to route fast signal traces in a consistent way on the same layer in order to minimize $Z_0$ discontinuities that will cause ringing, signal integrity issues and EMI problems.