Issue link: https://resources.pcb.cadence.com/i/1532919
3. After creating your net classes and groups, apply the differential pair Physical Constraint Set you made earlier to a Net Class, Net Group, or Differential Pair (NCls, NGrp, DPr), as shown below. 4. The Net Class, USB_SIGNALS(5), adopts the Physical Constraint Set (which we also named USB_SIGNALS) and the application is done. Note: While it may be implicitly understood, know that constraint sets are different from the objects, groups, classes, and regions they are applied to. They may be named the same as the net groups they're applied to, but that is simply for conve- nience. There is no relation between the names of your constraints and what they are applied to. Important Tip: Please be careful with the worksheet being selected. All constraint sets are made in the Constraint set category (e.g., Physical Constraint Set - All Layers in this case) Impact: Differential pair use and constraints are popular for carrying important signals that need some protection against noise. Managing the constraints for your differential pairs improves signal integrity and enhances overall performance. Differential pair signaling is popular in high-speed designs. Related Constraints: Differential Pair Static Phase Tolerance, Differential Pair Dynamic Phase Spacing Constraints Creepage and Clearance: Minimum Distances Between Conductive Elements to Prevent Electrical Arcing Purpose: Defines minimum distances between conductive elements to prevent electrical arcing and ensure insulation integrity. Clearance between two traces on a PCB across an air gap 12 www.cadence.com OrCAD X Constraint Management Guide