This read-write floating-point object sets the low-water-mark Blocks Error Rate below which the terminal clears an active link BLER alarm. An administrator sets this below the high threshold to give the BLER alarm hysteresis, so it doesn't toggle on every measurement interval near the trigger point. For example, widening the gap between the BLER high and low thresholds on a noisy link reduces nuisance alarm churn in the event log.