Slots that have no card installed should be reported as
empty(2).
Slots where a card has been physically inserted should be
reported as notReady(3) while the card is loading or
warming up, and ready(4) once the card is fully
operational.
Slots that support redundant action may report standby(5)
if they are not yet ready but waiting to go to ready(4) in
case of failover.
When this object is unavailable the Agent will report
the status notSupported (1).