This read-only Gauge32 reports cells with uncorrectable FEC or HEC errors received via the I-Port during the previous 15-minute period, per the description. It provides a finalized per-input error count useful for building a history of that RPM segment's line quality. For example, an admin compiles a week's worth of hcxRpmPrevMinUncorFecHecCells values across all I-Ports to identify the chronically worst-performing RPM input for prioritized repair.