This Gauge counts Far End Severely Errored Seconds — reported back via FEBE from the remote Medium/Section/Line interface — accumulated during the current 15-minute interval, the more serious far-end error metric. An admin cares because a Far-End SES event indicates the remote end is experiencing serious reception problems specifically from this device's outbound signal, directing attention to the transmit side of this local interface. For example, a nonzero Far-End SES count with clean local receive-side statistics strongly suggests a problem with this device's transmitter, its outbound fiber, or the far end's receiver optics.