Draw physical extent and electrical connection separatelyThe physical span classifier does not infer every net connection. Stub review and route selection need the actual signal path and reference structure.Draw physical extent and electrical connection separatelyExample: an inner-layer trace leaves a through viaL1L2L3L4L5L6L7L8Signal exits at an inner layer.Unused barrel can continue.Physical endpoints ≠electrical connection list.Backdrill may remove a stub.A through via connected to an inner trace is still physically a through via.³Ô¹Ïtv · Engineering illustration · Conceptual, not to scale