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Technology Stocks : The *NEW* Frank Coluccio Technology Forum -- Ignore unavailable to you. Want to Upgrade?

To: elmatador who wrote (4704)	12/21/2001 8:40:44 AM
From: Frank A. Coluccio	Read Replies (3) \| Respond to of 46821

Thanks, Ossy. "Pure optical to an Ethernet switch at the basement of the building and then CAT 5 copper to the apartment, providing 10 Mbps." It makes sense, and such a scheme appears to be the trend here for MDU/MTU/MHU (multi -dwelling, -tenant, -hospitality, respectively), as well. Five years ago, to the month, I had an interesting (to me, at least) discussion with Dr. George Hawley [Dr. Loop of Bellcore/Bell Labs fame] wherein I hypothesized a scenario, using the then NY City World Trade Center as a back drop to explore the economies of using fiber to the building (sonet, in that case, since metro Ethernet was only a wish at the time) and vdsl to the tenants. At that time George countered that if that was all you needed to do, then Ethernet would suffice. My argument was that due to the excessive distances involved and the desire to centralize hubs in a minimum of distribution closets (mini-pops), vdsl would be the preferred medium, since 10 and 100 BaseT Ethernet had a 100 meter distance constraint (the copper cartel at play, again!, thus necessitating multiple housings on each floor, in the case of the WTC and other similarly large commercial structures). In comparison, due to differences associated with VDSL's modulation scheme and resulting EMI/RFI characteristics (not to mention its silicon engineering that unlike Ethernet was actually designed to drive greater lengths of copper), vdsl could sustain distances into the thousands of feet, or over 600 meters, and still deliver full thrust. Keep in mind, this was 1996 that I'm referring to <whew! how time flies ...>. Using Ethernet in a single tower could involve occupying 110floors * [a minimum of] 4 closets per floor due to distances and tenant territorial preferences, or 440 closets, whereas using VDSL, only two. That's a substantial savings on UPS and HVAC, would you agree? In retrospect, it now seems odd that George would have suggested the use of Ethernet within the skyscraper, since he went on to found Diamond Lane Communications of Petaluma, California, a DSLAM vendor that was later acquired by Nokia. In case you are interested, and for any interested historians looking in [the discussion in question contains a number of other unrelated-yet-interesting anecdotes and factoids, imo], the Last Mile Thread discussion that I'm referring to starts at, approximately, here: Message 516224 FAC