This is the average value over the current performance-monitoring interval of the received optical power measured on the higher-numbered optical lane of this multi-lane coherent port during the current performance-monitoring interval. Averaging this lane's received power over the interval establishes whether this specific lane is running at a materially different power level than its sibling lane, which would suggest a lane-specific issue rather than a port-wide one. For example, an admin troubleshooting a coherent module reporting intermittent errors would compare inOpticalPowerLaneHighAvg against the low-lane average to see whether one lane is consistently weaker than the other.