Issue link: https://resources.pcb.cadence.com/i/1532919
6. Choose the USB_SIGNALS net class on the left then the USB_SIGNALS net class on the right so we can make rules from USB to USB (shown below). 7. Click Apply, then Ok. 8. The USB_SIGNALS Net Class gets added underneath itself and is listed as a Class-to-Class constraint (CCls). Click the cell next to it, then select USB_SIGNALS (this is the spacing constraint set, not the class). 9. Now go to the Net Class-Class > CSet assignment matrix worksheet. Scroll right until you see the classes overlapping in that matrix. 10. What this means is that any object within the USB_SIGNALS class will have USB_SIGNALS spacing constraints active in relation to any other object within the USB_SIGNALS class. This is inter pair spacing. 20 www.cadence.com OrCAD X Constraint Management Guide