This read-only integer is the upper boundary of the 'LOLO' (low-low, most severe under-range) alarm band for the EDFA parameter this table row represents. An admin uses it to know the ceiling of the critical-low condition, i.e. the point at which a rising reading would exit the worst-case low alarm. For example, a value climbing above this bound would move the parameter out of the critical-low state, while staying below it keeps the alarm active (illustrative).