This integer, ranging 1 to 96, identifies which of the past 24 hours' 15-minute intervals a given historical Far-End Line-layer statistics row covers, with interval 1 being the most recently completed. An admin cares because this lets them walk back through a day of far-end-reported history to pinpoint exactly when the remote end started reporting reception problems from this device. For example, finding a Far-End ES spike specifically at interval 30 while the corresponding near-end interval is clean narrows a transmit-side problem down to that specific past window.