RE: Two Tiered Internet

This unobstructed network was pioneered by Sprint on it's zero-CIR frame relay network and they carried this forward into their IP network as well. Other companies have carried forward this architecture as well.

If I understand you correctly I highly doubt this is the case. If every customer suddenly was to use the maximum link speed of their access pipes I would be very surprised if all the traffic would be carried. On the subject of tiered Internet you could argue that mobile/celluar access to the Internet is another tier. Regards, Neil