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ITU proposes that the fraction of time during which a pre-selected threshold is exceeded in the worst-month within a year is referred to as “the annual worst-month time fraction of excess”. This relates directly to situation where accumulation of outages at a specific threshold in one specific month has the worse effect on the transmission link than if compared to the accumulation that were distributed throughout the year. “Worst-month” is basically where the threshold is exceeded for the longest time. The study of the worst-month statistics is critical to the designers of telecommunication systems since there might be cases where impairment can be dominated by a single month of the year due to local weather pattern.