Here's how bursting works:
1) At this moment, the average consumption goes above the burst threshold, so the data is now ineligible for bursting, and the throughput drops to the max limit. At this point, the data is still flowing, so the average continues to rise, but not as quickly since the throughput is now lower.
2) At this point, the data flow drops to zero and afterwards, causing the average consumption value to start falling. (It's just a coincidence that my drawing has the data flow stop just as the average reaches this value. Had the flow continued, the red and green lines would both stay at max limit.
3) At this point, the average has fallen below the threshold, so burst is now eligible again. Note that when another data flow begins, the green (instantaneous) throughput jumps straight up to the burst rate again. At that point (not numbered) the average throughput begins climbing again.
4) Average has again exceeded the threshold, so the instantaneous rate is again throttled to the max limit. Note that this burst was shorter because the average had not fallen all the way to zero again.
When the second transfer finishes, the average begins falling sharply again.
Suppose there had been another spike in traffic between points 2 and 3 - it would only have been allowed to go to Max Limit because the average had not yet fallen below the threshold value.
The burst time value affects the slope of the red curve. The shorter the time, the faster the red line meets the green line, thus shorter, but more frequent bursts. A longer time will result in longer bursts but requiring a longer period of inactivity to go back below the burst threshold again. In general, I would say that if the burst amount is much higher than the max and threshold values, you're going to want longer durations or else the bursts will be so short that they're hardly noticeable and hardly beneficial.
At the beginning, there had been no traffic, so the average starts at zero. The average is below the burst threshold, so the data immediately begins flowing at the burst rate. This causes the average consumption to begin rising sharply.
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When given a spoon,
you should not cling to your fork.
The soup will get cold.