This field records how much the counter for frames transmitted successfully after exactly one collision 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, some background collision activity here is normal on a shared or half-duplex segment, so admins usually only worry when this count grows in step with multiCollision and excessCollision on the same port. For example, 7 frames 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.