This is the highest value recorded during 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. The highest received power seen on this lane during the interval helps confirm this lane isn't being overdriven relative to its sibling lane, which matters for balanced performance across both lanes of the coherent signal. For example, comparing inOpticalPowerLaneHighMax against the module's per-lane overload specification helps an admin confirm the high lane isn't at risk of saturation after a span shortening.