This is the configurable alarm threshold for the FEC byte-error-correction counter on a DWDM trunk-side interface; once the actual corrected-error count, tracked in cMsDwdmFECCurrentByteErrCor and cMsDwdmFECIntervalByteErrCor, crosses this value, the system is expected to raise a degraded-signal condition. Setting this threshold too high delays detection of a genuinely degrading optical path until errors are already severe, while setting it too low generates alarm noise from normal, healthy FEC activity that corrects a baseline level of errors as designed. An engineer tuning alarm sensitivity on a long-haul DWDM trunk with known marginal fiber might deliberately raise this threshold slightly above the historical baseline correction rate to avoid nuisance alarms while still catching real degradation trends.