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To: GraceZ who wrote (18091)	12/20/1999 10:57:00 PM
From: Frank A. Coluccio	Respond to of 29970

Hi Grace, No, you're not reading it wrong. @Work was in the back of my mind but I paid them no mind, earlier. If they are actually providing this transit (as opposed to just "offering" it), then it's most likely -- no, make that, it is definitely -- "partitioned" in some way from the backbone links being used by @Home proper. Let's not forget what this backbone actually is. It's a wavelength division multiplexed pair of paths, not simply a single concatenated stream. Within either of the two (2) 2.5 Gb/s streams there is the potential to support multiple T3s, OC-3s, OC-12a, etc. Each one of these pipes, in fact, is capable of 48 T3s. I highly doubt that they are using the full dual OC-48 (5.0 Gb/s) directly onto a single router port at each node point. Instead, they are probably breaking them up into OC3s and OC 12s, since those are the highest speeds that many of their in-place routers were able to support until recently, at the router port level. [Although, we are now seeing OC-48 router ports beginning to appear more commonly.] If they elect to lease some of these T3s out, or if they permit tunneling on the greater backbone, they can do so without compromising the integrity of the backbone part that is being used by either @Home or @Work. Good find, though. This may even negate, possibly, my previous clarifier on the use of the term "VPN" in my preceding message. It gets down to colloquialisms and semantics at some point, and how finely you want to split hairs, if not strands of glass. Regards, Frank