This field records how much the counter for late collisions detected on this interface — collisions that occurred after the first 64 bytes of a frame had already gone out changed during the specific collection interval this historical record captured — a frozen snapshot of that one interval's increase, not a live running total. For a network admin, a late-collision count that climbs on this specific link is the textbook symptom of a duplex mismatch or a cable run that exceeds the Ethernet distance limit. For example, 6 late collisions in the last interval on this specific FCoE path would already be worth a closer look, since this counter should normally sit at or near zero.