This read-only integer is the upper boundary of the 'HI' (high, but not most-severe) alarm band for the EDFA parameter this table row covers. It lets an admin see the ceiling of the ordinary high-alarm range, distinct from the more severe HIHI band defined by the neighboring columns. For example, a reading just under this value would still register as a 'high' warning rather than escalate into the high-high alarm state (illustrative).