This field is the single highest per-interval delta value on the live, currently-updating stats object for frames that were dropped because they experienced too many collisions (the classic 16-attempt limit) before ever being transmitted successfully — the worst burst seen across the retained collection history. This is the number to check after an alert fires, since it shows the worst single interval for excessCollision on this interface even if the current live value has already settled back down. For example, a recorded max of 19 frames in one interval would flag the worst burst the interface has seen, useful for correlating against a specific outage window.