Each row entry represents a MDA slot in an IOM card in a
chassis in the system. Entries cannot be created and
deleted via SNMP SET operations. When a tmnxCardEntry
has tmnxCardAssignedType or tmnxCardEquippedType equal to
an IOM card type that supports MDA slots, a tmnxMDAEntry is
created by the agent for each MDA slot on that IOM card.
Before a tmnxCardEntry can be deleted, each tmnxMDAEntry for
that card must be in the proper state for removal.