Ken, I suppose that the composite trunking of the type being discussed in the Avici model could be used to "aggregate" a number (4) of OC-48 flows into an OC-192 equivalent, but it would not yield an OC-192c (concatenated) link in its present form, at least not from what I can discern.
But given what they are doing, I don't know if that really matters. From the Avici pages that I've viewed, they don't mention OC-192 except in passing, although they do aspire through their participation in ODSI to go to 768.
Here again I have to wonder if they speaking about an aggregated flow of 16 OC-48s to an equivalent OC-768, or a concatenated one which meets the hierarchical parameters of an STM-256, such as one that would be formed in silicon?
I suppose the answer is in the literature, I just haven't gone that deeply into it. Since the IP framework is not that concerned with SONT/SDH overheading at the sub-dwdm level, and since actual forwarding doesn't take place at the 768 rate (yet), I suspect that it's simply an aggregated flow equivalent to 768, but I don't really know for sure. If someone else knows the answer, please post.
Regards, Frank |
