This is the highest value recorded during the current performance-monitoring interval of the accumulated chromatic dispersion measured on this channel during the current performance-monitoring interval, expressed in picoseconds per nanometer (or per picometer for the averaged/min/max readings), reflecting how much the fiber has spread the signal's spectral components apart in time. The highest dispersion value seen in the interval matters most because if it approaches the coherent receiver's electronic dispersion-compensation limit, the signal risks becoming unrecoverable. For example, if chromaticDispersionMax drifts closer to the transponder's compensation ceiling after a fiber repair splice was added, an admin would flag that splice location for review.