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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here

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To: Frank A. Coluccio who wrote (6644)	3/13/2000 1:12:00 PM
From: Bill Fischofer	Read Replies (4) of 12823

Re: Eye safety TeraBeam may introduce a new wrinkle into the eye safety question. Because TB is Point to Multipoint (PTMP) this implies that the transmitting laser is swept through an arc. As I understand it, all receivers receive all downstreams in their sector and encryption is used to ensure that customer A doesn't see what customer B is being sent, etc. This necessarily implies that the beam will swathe an entire area whether or not there are receivers "tuned" to it in the path of the beam. Gilder makes reference to "diffusion" as the means of preventing eye problems which is why the receiver is the size of a small satellite dish (presumably to allow it sufficient beam gathering power). I'm sure that this implies that the "diffused beam" is safe to the naked eye but the question remains what about telescopes and binoculars. It's entirely possible that someone may use such devices without even being aware that they are in a TeraBeam "sector". It will be interesting to see if TeraBeam addresses this aspect of their technology.

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