This PmStatBitmap identifies exactly which statistic(s), from the Current Bin of the PM profile named by cienaCesPmInstanceProfileType on this same row, the Adjustment TCA feature is actually watching for this instance, per its DESCRIPTION (whose text is cut off mid-sentence describing how those statistics are used). Because a PM instance can have many possible counters available to it (errored seconds, severely errored seconds, code violations, and so on depending on the profile type), this bitmap is what narrows Adjustment TCA down to just the one or few that actually matter for that port, rather than evaluating every counter the profile happens to expose. For example, on a DS3 instance this bitmap might identify only the Sesl (line severely errored seconds) counter, meaning a spike in Pcv (P-bit code violations) on the very same port would never by itself trigger an Adjustment TCA, since it isn't one of the watched statistics.