This object holds an OID pointer that links this ifTable interface entry to the RowStatus variable of the underlying Passport component that the interface represents. Network management software follows this pointer rather than the ifIndex alone to find the actual component-management row and check or change whether that component is active. For example, an interface representing a physical trunk card might have this object pointing to a row in the card's own status table, letting a monitoring tool confirm the card row is still valid before trusting other data linked to it.