This object configures the severely errored seconds threshold for the current 15-minute interval on the SONET line layer, above which an alarm is generated, applying equally to Far End and Near End measurements. An administrator sets this lower-tolerance threshold to catch serious line-layer degradation quickly, regardless of whether it is detected locally or reported from the remote end. For example, a spike in near-end severely errored seconds crossing this threshold would alert an administrator to a serious line problem within the current 15-minute window.