To: Frank Byers who wrote (8762 ) 2/23/1998 9:16:00 AM From: qdog Respond to of 152472
It's not that GSM won't work with ATM or CDMA won't work with TDMA, it has always been what both are tweak to and have characteristics of. With each translation, you lose more B/W, overall. Not necessarily, on the choosen B/W of the channel on IS 95. Yes you had the legacy cellular A&B system, but you also had the PCS system that was fracture into 5 separate license's. There is nothing to stop anybody from expanding those channels to whatever B/W. It is in fact incomprehensible to me. I've work with M/W systems over the years that were different B/W's; narrow, medium, wide. Still all were done the same way. Differing patents for all three, not hardly. As of today. IS 95 is the widest wireless system deployed in mobile wireless. What is ETSI W-CDMA? A 5 Mhz channel. Now how is it going to be accomplished, variable rating vocoders/decoders that fit the demand requested. You are going to use the same 384 Kpbs B/W to do a voice call? No you will use 13 Kbps or even 8 Kbps. Do you use 64 Kbps in GSM for a voice call? But that is exactly what a radio channel can do, but because voice demands are such that it is ADPCM to 13 Kbps and can even go lower in that 64 Kbps time slot. That is the unique feature of generic CDMA, in theory it will give me the alotted B/W to accomplish what I demand to a point. It's far more difficult to do that in TDMA. For this last paragragh, there isn't any difference in how CDMA is done whether it is 1.25 Mhz channel, pi Mhz channel, 5 Mhz channel, 10 Mhz channel or 100 Mhz channel. If there was such a HUGE difference, then why is QCOM 4 patents so important to W-CDMA? That is like saying that there is a BIG difference between IS-136 and GSM. There isn't that much difference, but basically the number of ADPCM calls placed on a radio channel. I've used Ericsson equipment in differing application from land mobile to PABX's over the years with no complaints. I however take a firm stance on what they have been preaching about GSM vs CDMA. I've contend all along that TDMA was inferior for the fastest growing and most demanding customer, data. By all this hubris about CDMA, N-CDMA to W-CDMA, that has been proved. Voice isn't the issue. As to money being tied up, you'd be surprise just how many companies it is tied up in. I sold my NOK solely for one reason, the claim no problems with Asia. I don't buy that. I also rolled that money into another European telcom (part of it) into Alcatel, who I consider undervalued forward looking. I also rolled more of the cash into an European software company that I consider very highly, SAP.