This value reports whether this card is currently the active(1) or standby(2) member of a redundant pair, per the description. This is the field an admin checks to confirm a failover actually happened as expected, or to identify which physical card is presently doing the work before performing maintenance on the other one -- pulling the active card by mistake because you assumed it was standby would cause an avoidable outage. A card showing standby(2) that unexpectedly flips to active(1) without a corresponding planned maintenance action indicates the previously active card failed or was reset.