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To: gdichaz who wrote (37892)	8/11/1999 11:06:00 AM
From: Brian	Read Replies (1) \| Respond to of 152472

Brian: Still curious re the role of CDMA, if any, in the MMDS arena - or in any wireless data transmission where the requirements are fast and large. Are you making a distinction that the wireless "fiber" point to point systems which WCII, TGNT and NXLK supply have no reason to use CDMA, since CDMA only "adds cost"? Aren't these companies moving right now to point to multipoint transmission? Is there any role for CDMA there? Your comments seem to imply that there might be. By CDMA do you mean a CDMA standard? If so, even with the improved data rates of 1-2 Mbit/sec I don't see this satisfying the needs of backbone and loop applications. These are T-1 speeds which in this day and age are obsolete. My brother has a web site he runs from T-1 link and the speed is woefully inadequate. He is upgrading to a 4Mbit/sec DSL service. This is one person with one web site! I can also say that my cable modem is barely adequate. If more bandwidth were available I would use it. I don't see the rates offered by the current set of 3G standards, while impressive, as being able to satisfy the MMDS market. The terms MMDS and LMDS have never been very clear, however. The channel "division" in code division multiple access is provided by the use of a "code." While this has many advantages, if you can provide the channel division using directional means ("spacial division multiple access" if you will) it will probably be cheaper and simpler. Typically point to multipoint are harder to configure directionally, so that is why I note it as a factor. Nonetheless, if the link is going to be shared by many users and up and fixed for some time, you would probably use directional means of channel separation. I don't see any of the available CDMA standards as being directed to this market. Again, that's OK. The market they are directed to is very big indeed -- the biggest. Let me give you an example. A possible configuration would be to have a base station providing CDMA2000 service to a set of mobile customers on one side, using a MMDS style backhaul at the back end to communicate with the switch. To different applications using two different technologies. The other major reason to use CDMA is interference resistance from third party jammers. This is the main reason Teryon (is that the companies name?) is using it in their cable systems.