A read-only INTEGER enumeration classifying the nature of this specific measured second, for example error-free, errored, degraded, or severely errored. It gives a direct per-second classification of link quality, letting an admin see at a glance whether the most recent second was clean or one of the several impaired categories. For example, an admin polling p2mpSu1SecType and repeatedly seeing severely errored rather than error-free would know the link is currently in a bad state right now, not just historically.