This read-only integer is the lower boundary of the 'LOLO' (low-low) alarm band for the EDFA parameter tracked by this row, effectively the floor of the monitored range. It tells an admin how far the parameter's value is expected to fall before the device even considers it within its defined low-low alarm range. For instance, a reading at or below this floor represents the most extreme low condition the table anticipates for that parameter (illustrative).