This field is the average, as continuously recalculated on the live object, of the per-interval delta values for frames that were eventually transmitted successfully but only after more than one collision on the wire, taken across the retained collection history for this stats object. Admins watch this to separate a genuinely sustained problem from one noisy interval — if DeltaAvg for multiCollision on this interface is climbing, this is a milder cousin of excessCollision on the same interface, rather than a one-off spike. For example, an average of 3 frames per interval sustained over many polling cycles points at a chronic issue rather than a one-time glitch.