This read-write integer, also expressed as a percentage times 100 of the measurement interval, sets the low-water-mark share of Errored Seconds below which the terminal clears its ES alarm. An administrator sets this lower than the high threshold to keep the alarm from flapping as the errored-second proportion hovers near the trigger point. For example, setting a wider gap between the ES high and low thresholds smooths out alarm behavior on a link with sporadic single-second glitches.