5. The best option is to apply a spacing constraint set that's already created, so click the Referenced Spacing CSet column
option, then select the SCS1_12MILS CSet we created earlier.
Now that you've learned how to set constraints for traces, let's look at Class-to-Class spacing, as we need it for differential
pairs.
Differential Pair Spacing Constraints
For differential pairs we need to create class-to-class spacing. You already know how to make net classes, so we will show
how to set differential pairs to have the right intra-pair spacing (edge to edge, differential pair to differential pair) and
inter-pair spacing (differential pair to any other non-differential pair).
Differential pairs indicating inter-pair and intra-pair spacing
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OrCAD X High-Speed Digital Design Guide
