This counts cells that passed HEC but were found to reference a VPI and VCI (virtual path and channel identifier) that doesn't correspond to any provisioned circuit on this card. This distinguishes cells that are structurally intact but semantically invalid, arriving with an unrecognized circuit identifier, which typically means either a remote misconfiguration is sending traffic to a VPI/VCI that was never provisioned locally, or a circuit was recently torn down without updating the far end. For example, cardInErrorVPIVCI starts incrementing right after a PVC is deleted locally while the remote switch continues sending cells tagged with the now-defunct VPI/VCI.