Each row entry represents an Ethernet port on a IOM card in a chassis in the system. Entries cannot be created and deleted via SNMP SET operations. Before an IOM 'cardEntry' can be deleted from the tmnxMDATable, its supported 'tmnxPortEntries' and 'tmnxPortEtherEntries' must be in the proper state for removal. The tmnxPortEtherEntry contains attributes that are unique to the Ethernet TmnxPortType.