This field is the average, as frozen at the moment this historical snapshot was taken, of the per-interval delta values for oversized Ethernet frames received on this interface that exceed the maximum allowed frame length, 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 giants on this interface is climbing, on this port, rather than a one-off spike. For example, an average of 4 oversized frames per interval sustained over many polling cycles points at a chronic issue rather than a one-time glitch.