This field records how much the counter for frames that were eventually transmitted successfully but only after more than one collision on the wire 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, this is a milder cousin of excessCollision on the same interface, and a rising trend here can be an early warning of the same duplex or loading problem before it gets bad enough to actually drop frames. For example, 3 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.