This read-only field reports which Data Link Connection Management Interface standard is actually in effect on this link, LMI Rev 1, ANSI T1.617 Annex D, or CCITT Q.933 Annex A, determined from the last poll received from the DTE when the port is configured for AutoDetect. An admin checks this after enabling AutoDetect to confirm the switch correctly identified the customer equipment's LMI dialect, since a wrong detection would explain PVC status frames being misinterpreted. For example, lportDCEOperDlcmiStd reporting ansiT1-617-D(3) confirms the port auto-detected ANSI Annex D signaling from the connected router, so the admin knows not to manually override the LMI type.