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To: Kayaker who wrote (3809)	12/1/1999 12:07:00 AM
From: Bux	Read Replies (1) \| Respond to of 13582

Wireless for voice is exploding, 1XRTT will be plenty fast for many/most applications, and we recently had a Nortel exec state that many providers are maxed out on their available spectrum. I don't think any CDMA carriers are maxed on on spectrum or probably even close but some TDMA carriers are. So if IS-95 provides 3X TDMA and GSM, and 7-10X AMPS, then these carriers are only 1/3 full if they switch to IS-95. But why would they switch to IS-95 if they could switch to 1XRTT? I think 1XRTT provides 2X IS-95 (or 6X TDMA) so a carrier switching to 1XRTT from TDMA would have at least 5/6 of their spectrum free so some of this could be allocated to HDR, the rest could be allocated for future voice needs. I think these figures are in the ballpark but I welcome any corrections. Bux

To: Kayaker who wrote (3809)	12/1/1999 12:42:00 AM
From: Lance Bredvold	Respond to of 13582

A few days ago I posted an answer on a Yahoo Leap board of which I was pretty proud, but which I expected might generate a complete rejection by someone more knowledgeable. That objection did not arrive so I will attempt the same explanation in this more sophisticated audience. I don't believe there is any real shortage of spectrum, if you are willing to spend enough money. To carry it to the extreme, one could mount a base station and switching center in everyone's backyard running fibre optic cable to it. Unlikely each of these would ever reach capacity. And cells would be small and the power would have to be limited to not interfere with cells two doors down in a TDMA system. The point I was getting to was that AT&T is reengineering their system in NYC, but that is an extremely difficult feat. I suggested drawing 3 or more hexagons with a dot in the center of each and then trying to increase the number of hexagons in that same space while continuing to use the existing center dots. And then imagine getting rights to all the locations for additional base stations and adding cable routes and so forth. Nortel recently announced the ability to service 17 users per sector vs. the more common 13 of existing venders. For complex reasons CDMA can add pico bases between cells to increase the ability to handle users while TDMA cannot. A recent discussion between engineer and Clarke suggested CDMA was capable of handling somewhere between 3 and 5 times the number of subscribers per base of a TDMA system. That had me changing my hexagons to squares and triangles. Am I on the right track? Lance