A.Label B.VPI VCI C.EXP D.TTL E.FCS F.S flag
A.SNMP traps B.fabric cards C.exec-level configuration D.privilege-level configuration E.admin-level configuration
A.for trail trace identification B.as the backward defect indicator C.to transmit information between OTU termination points D.to extend command and management functions over several frames E.General communication channels 1 and 2 (GCC1/GCC2) do not belong to OTU OH