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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here -- Ignore unavailable to you. Want to Upgrade?

To: Frank A. Coluccio who wrote (1493)	5/2/1998 4:03:00 PM
From: Ray Jensen	Read Replies (1) \| Respond to of 12823

Frank, Who can forget the blimps floating gracefully out of the hangers? No kidding, maybe the giant blimp hangers at Moffett N.A.S. in Sunnyvale, CA will be returned to their original intended use. Indeed, I looked in my FCC frequency allocation chart, and it appears that the 47.4 to 48.2 band of millimeter wave frequency is set aside for Skystation. That's 800 MHz! Of course, it's even a higher millimeter wave frequency band than the 28 GHz band of LMDS. That means it will be even more sensitive and challenging to work with. And don't forget, the signal is up and downlinked 21 km above earth, with a footprint of 1000 km. at its maximum diameter. That's a big area, and will take a lot more transmission power than LMDS, which has a comparatively tiny transmission range under 10 km. Depending on what type of modulation is used for transmission of the digital data, my guess is that they will be able to transmit 4 bits per hertz. That adds up to a maximum bidirectional transmission rate of 1600 Megabits per second within the 800 MHz allocation. That means that one Skystation could support a little over 1000 simultaneous bidirectional T1 circuits (1.544 Mbps x 1000= 1544 Mbps). Yes that's a fair amount of bandwidth...about ten OC-3 circuits worth. How many metro area ISPs have that kind of bandwidth available? What if some of the bandwidth were used with VoIP as a local loop bypass? If compression allows 8 VoIP calls per DS0, you could support 24,000 simultaneous VoIP calls per 100 MHz of spectrum. There is an endless list of possibilities of what to do with the spectrum, if the bandwidth can be delivered economically and in a reliable manner to customers. Ray.