This read-write INTEGER (10..2500), defaulting to 50 per the description, defines the minimum number of cells per second that must be received before the error-ratio thresholds are even allowed to trigger a frequency hop. It exists to prevent a low-traffic port from tripping error thresholds based on statistically meaningless small sample sizes. For example, an admin raises hcxPortMinErrRatioCells on a lightly loaded upstream port to avoid spurious frequency hops caused by a handful of errored cells.