This Gauge counts the number of Loss Of Signal events encountered at the Section layer, a cumulative (non-interval-bound) tally rather than a per-15-minute or per-day bucket. An admin cares because LOS is the most fundamental physical-layer failure — no optical or electrical signal detected at all — so a rising count here over time indicates a section experiencing repeated total signal drops, such as a loose connector or intermittent fiber break. For example, a section that's had its LOS counter climb by several counts over a week, even briefly each time, points to an intermittent physical connection problem worth a hands-on inspection.