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To: JMD who wrote (7845)	2/1/1998 7:15:00 PM
From: Caxton Rhodes	Respond to of 152472

2nd China CDMA International Summit 23, 24 & 25 March, 1998, Beijing Guess who's coming to lunch? Day one sponsored by LU, day two, QCOM, day three.......................ericy!!! Dr. J Gives a discussion on: Evaluating the results from the latest global CDMA deployments worldwide On day 2, Ericy is on on panel discusion of: Evaluating evolution of CDMA towards third generation systems and forecasting how standards for CDMA might develop for the whole schedule: cdg.org It looks like a big cdma push by LU &Mot & others. Caxton

To: JMD who wrote (7845)	2/1/1998 7:39:00 PM
From: qdog	Read Replies (1) \| Respond to of 152472

Nope, there isn't anything different except alot of hot water. It depends on B/W and use of the spectrum. Satellite Appeal is first it's wireless. IN traditional GEO, you have fix 24 hr access to a particular bird in the the Clarke's Belt. Satellites tend to be expenxive as they are large, multi functional. Latency for data as been term a problem, but I find that to be an accuse to mask data software/hardware problems. Earth station cost tend to flucuate with requirement. At Ku band 11/14 Ghz weather is an issue. Rain drops are about the size a wavelength of Ku. YOu tend to have fades and lost of service during rainstorms. DSS dishes are Ku. The new LEO and MEO proposals are cellular systems in reverse. Instead of you, the user, are traveling through the cellsite. Simplified for the blinking time displayed crowd, the cellsite passes overhead at around 110 minutes on average. Satellites are smaller and multiply satellites can be lifted per launch. Some of these systems are going to be in the Ka band which is higher frequency than Ku. Again weather will affect or impair these, even they are closer to the earth. Common myth propogating is published hype, they are closer and the latency problem is no different than traditional terrestrial systems, which is true. Geo is 22,000 miles vs these 150 to 600 mile beasties. The myth, free space loss in link budget is minimal. In short, there isn't much difference in loss of the radio signal. Still going to require high performance antenna's and the such. With all systems, bandwidth is at issue. I don't care if you are at 4 Ghz, 14 Ghz or 27 Ghz, it the appropriate amount of bandwidth that is allocated. IF it is a 30 mhz B/W then you aren't talking much at all. If you are talking 500 Mhz then that is much larger. The DSS Deathstar's of DirectTV and others are using compressed video. Works fine. The are able to get more in to the same than usual computer data that refuses to allow compression techniques. I use to ask the computing world why it took longer to send a Word document with are it's logo/shaded garbbage via data at 9600, but a 9600 fax could sen that printed version faster. Always mess their point heads up. Big disadvantage, besides weather, is launch reliability. All this junk is also at issue with NASA. Safety of Shuttle and space station operation is coming into question. Teledesic may have to go back to the drawing board. There is a angency that tracks space junk like Ed White spare glove in his first walk in Gemini program. They actually no where it is at all time. Three Shuttle launches over the past few years have actually been delayed because of junk floating around in space. Escalating cost due to delays, launch availability, etc. drives the cost up. Also a higher degree of QCing is done to insure that the stuff you place actually will deploy and work. Motorola has had, I believe, 3 failures so far. Little hard to fix the stuff once it's up there. So Maurice you have a new US government official that is going to mess with $illion $ill in the future. Terrestrial Advantage easily maintain. Far more costily to deploy over the smae geographical area, that LEO, MEO and GEO can cover. Better free space loss than the satellites which translate into cheaper antenna/recievers and amplifiers. Again Bandwidth. Can't compete with a single fiber. It the computing world that is pushing the world to fiber. They do not attempt to utilize bandwidth in an efficent manner. They are wasteful. As long as they keep raising the bar for bandwidth of there systems, anything with limited bandwidth is unappealing. Coax is a finite system that also delivers wideband TV signals. That bar will be raised by HDTV which is even more a hog for bandwidth. Fiber is also finite but with WDM systems up to I think 18 different light sourcres, that is billions and billions of bits. So this 3G debate is kinda a red herring, in some regards. I'm going to mainly be sitting down to compute, be it at a restaurant, airport, hotel, work or home. Who is going to be driving down the road at 70 miles per hour surfing the web. I'm still angry at drivers that put on makeup or reading newspapers instead of concentrating on the road. Oh boy, now I get to snap and growl in the morning at idiots in stock chat rooms while driving.