This is the average value over the current performance-monitoring interval of the Q-factor measured on this channel during the current performance-monitoring interval, expressed in dB, a composite measure of signal quality that correlates with the expected bit error rate. The average Q-factor over the interval is commonly used as the headline health indicator for a channel in day-to-day monitoring dashboards. For example, an admin doing a monthly health review would scan qFactorAvg across all channels on a shelf to identify any wavelength trending toward marginal performance before it causes a service-affecting event.