Issue link: https://resources.pcb.cadence.com/i/1532919
3. Return to the Physical > Net > All Layers worksheet, find USB_SIGNALS(5), scroll horizontally down to the Differential Pair > Referenced Intra-DP Spacing CSet, select the drop down cell and choose the spacing constraint set we just created, SCS_INTRA_DP. 4. Now our differential pairs within the USB_SIGNALS class have their own spacing constraints for their inner traces. Visually we're talking about what you see in the image below: Reason for these Constraints: We want to avoid other signals (whether differential pair or not) from creating crosstalk on our differential pairs. We achieve that by spacing them far enough apart and enforcing that spacing rule. However, the traces within the differential pairs themselves need to be close to each other, so they have their own special intra pair spacing constraint, which is shown in the image above. This intra pair spacing constraint makes it so the differential pairs don't violate their own spacing rules. Impact: Reduced chances of crosstalk by preventing the designer from allowing signals to get too close. Related Constraints: Class to Class Spacing, Net Class Spacing Constraints 22 www.cadence.com OrCAD X Constraint Management Guide