Maybe a slightly off topic math-geek kind of question to take time out from the ARIN/death-of-IPv4/IPv6-evangalist thread of the week. Has anyone found any value in examining network utilization numbers with Fourier analyses? After staring at pretty MRTG graphs for a bit too long today, I'm wondering if there are some interesting periodic characteristics in the data that could be easily teased out beyond, "Well, the diurnal fluctuations are obvious, but looks like we may have some hourly traffic spikes in there too. And maybe some of those are bigger every fourth hour." A quick Google search turned up nothing at all. With many EE-types who find their way into network operations and wannabe-EEs already there, I found that maybe a little surprising. I know the EEs love Fourier transforms.