This reports whether the system's secondary clock, as observed from this card, is currently normal or in failure, and on a BIO card specifically reflects the status of Timing Module 2. A failure(2) reading here specifically means the chassis's backup timing path has failed, which by itself doesn't cause an outage as long as the primary clock is still normal, but it does mean the system currently has no protection if the primary should also fail. For example, seeing cardSystemSecondaryClockStatus at failure(2) while the primary is still normal(1) doesn't create an immediate problem, but it removes the safety net an admin would otherwise have if the primary reference degrades next.