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To: Will Lyons who wrote (405)	4/18/2001 11:11:28 AM
From: kinkblot	of 565

Hi Will. Re: weather. From TeraBeam Q & A: Q: Will weather or other atmospheric elements interfere with the performance of Terabeam's service? A: While atmospheric conditions affect transmissions over longer distances, the lengths of the optical transmission paths in the Terabeam network will be kept as short as necessary to provide high performance, given the weather conditions of each city. terabeam.com Free space lasers. George Gilder is big on this as a "last mile" solution and has a chapter on TeraBeam in his book Telecosm. They take weather into account in designing their networks, but Gilder pooh-poohs the concerns about fog, arguing that for the last mile, point-to-multipoint application, the problem has been tackled by brute strength engineering for the worst case scenario (Seattle?): "Depending on whether the system is in foggy Seattle or sunny Tucson, TeraBeam requires each point in the network to be within three to 10 kilometers of a hub." TeraBeam uses high powered (5 watt) pump lasers from a company called IPG Photonics, which filed papers in December for an IPO: hoovers.com The market cap would've been ~$1.4 billion at the proposed price, but they can probably forget about that until market conditions improve... a lot. WT

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