Network utilization is dependent on time, varying according to the hour, day, or week and reflecting activity spikes due to special events (e.g., sports games, news conferences). Figure 1 shows a typical profile of aggregate subscriber traffic throughout the day. This is just one example, but the key thing to note is that the demand fluctuates over some time period. In this case, one can see that there is approximately an eight-hour period of prime-time network activity with 16 hours of relatively low usage.
In fact, primetime growth is outpacing average traffic growth, and thus driving CapEx spending for new access equipment to meet this demand.