Thanks Murph, that is pretty much what I thought. I presume that the aggregation device is a switch/router of some sort.

From what I was told about my service and the speeds I get, I suspect that my provider is doing some sort of traffic 'shaping' based on system load, as I seem to get considerably higher bandwidth than I pay for at times.

The issue I was having with inconsistent download speeds was with my cable modem and, in the end, required a reboot. Given that I tell my users to do this several times a day, Its a wonder I didn't think to try this before calling my ISP.
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Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!