This is the average value over the current performance-monitoring interval of the received optical power level measured at this port's input during the current performance-monitoring interval, expressed in the device's optical-power units. The average received power over the interval establishes the baseline signal strength this receiver has been getting, which is compared against the receiver's specified operating range. For example, if inOpticalPowerAvg has been gradually declining over several weeks, an admin would suspect connector contamination or fiber aging and schedule a cleaning or inspection before it drops further.