This is the standard deviation Quality Factor (Q-factor) for the OTU layer over the bin, encoded as a PmInteger32Milli milli-scaled integer (divide by 1000 to get the actual factor), representing how much the signal quality wandered on this section, per the MIB's description. A widening Q-factor standard deviation on this specific port, even if the average looks fine, is often the first quantitative sign of an unstable optical path -- e.g. a marginal connector or a laser nearing end of life -- because it means the signal quality is bouncing around rather than sitting on a steady value; as a 'total' bin it never rolls over on its own the way the 15-minute and 24-hour bins do -- it only resets on an explicit clear or a card reset, so a high count here just reflects long uptime, not necessarily an active problem. A raw value of 8068 here (i.e. a Q-factor of 8.068) would be a solid, in-margin reading for this bin on a well-engineered span; values drifting down toward 6.0-6.5 are the range where carriers start planning intervention on this port.