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To: Leigh McBain who wrote (156)	3/24/2000 7:17:00 PM
From: RocketMan	Respond to of 227

I agree with your conclusion, given your architectural concept. What I thought they might be doing, though, is to transmit an array of pencil beams from a transmitter, that would have to be received and detected by a signal chip array assembly. It seems that this would be much more efficient than a single beam of light transmitting the entire signal. However, the 85% statement would not be consistent with this design.

To: Leigh McBain who wrote (156)	3/25/2000 1:05:00 AM
From: Webster Groves	Read Replies (1) \| Respond to of 227

<<Most optical transmission systems also use more than one transmitter, therefor you would also have to block more than one beam to actually cause a disruption of service. At least that is certainly the case with our product.>> Good point. The system could use two 4 cm dia. beams (for example) spaced 50 cm apart and get around the bird problem, unless bald eagles are no longer endangered. But with redundant beams paths, don't you have to worry about phasing the path lengths well enough so that the time difference for reception is compensated. For a gigabit/sec data rate, you'd need to individually compensate each receiving station to less than 7.5 cm (90 degree) path length difference (combo of optical and electrical path lengths). Shouldn't be that hard to do, but adds complexity and therefore cost. Higher data rates make phasing even harder. - wg