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To: mightylakers who wrote (118696)	5/11/2002 10:17:52 PM
From: q_long	Respond to of 152472

That basic point seemed to be confused with a lot of acronyms and tangents. A succinct answer would do just fine

To: mightylakers who wrote (118696)	5/12/2002 12:20:34 AM
From: Eric L	Respond to of 152472

Lakers, re: Multi-Mode whatever << That's the bottom line. Eric was confused before, and I pointed that out to him that the so-called backward compatibility can only accomplished by dual mode or multi mode phone. Well somehow I guess that message didn't get through. >> LOL! Ya know Lakers, I wonder how I made it through my wireless years without you. I thought I pointed out to you, what you are now attempting to point out to me. "Well somehow I guess that message didn't get through." But then again, I was always soooooooooo confused. Evidently so were the engineers that supported me in my real wireless life, and the professors that formally educated me in classroom. << I pointed that out to him that the so-called backward compatibility can only accomplished by dual mode or multi mode phone. >> I think we agreed on that, did we not? << so-called backward compatibility can only accomplished by dual mode or multi mode phone. >> Yes. You are absolutely correct. And that is how CDMA has evolved isn't it? Here I am now, using Verizon as a primary cellular carrier as I have been for 10 years (starting with BAM, then BAM NYNEX). When I first abandoned my fixed AMPS car phone in favor of a Qualcomm DUAL-MODE QCP800 in April 1997 (my 3rd mobile since I already had a single-mode/single band GSM for Europe and one for the US, sharing a single SIM and subscription). I had a dual-mode phone that worked on a single network. ... or would you consider that to be what q_long calls "tandem networks"? Subsequently I used a QCP860 dual-mode on a single band and since then I and my wife have used several "TRI-MODES" (Verizon's term). This of course necessitated by the fact that Verizon put together 4 regional ANSI-41 AMPS based networks (BAM - NYNEX - GTE- AirTouch) upgraded to digital cdma and also added in acquisitions from ALLTEL and PrimeCo, in 2 different frequency bands.. So as you say "so-called backward compatibility can only accomplished by dual mode or multi mode phone", to which legitimately one should add multi-band. I thought that was a given. Our buddy q_long is talking about parallel networks and tandem networks. Is Verizon running parallel networks and/or tandem networks? So far as I am concerned as a user, they are not. And so it goes with a GSM/3GSM network. I can use my 5 year old Bosch worldphone on Vodafones GSM GPRS networks today and I'll be able to use it on their GSM/3GSM networks 5 years from now after they have upgraded some portions of those networks to WCDMA. If I buy a new dual-mode WCDMA Nokia this fall or a new dual-mode Samsung powered by a MSM6200 when they are available a year or so later, I'll be able to use either one of those phones on any one of some 400+ GSM networks in 176 countries for basic voice and circuit switched data services regardless of whether or not those networks have implemented WCDMA (assuming those phones serve at least 3 frequency bands (900/1800/1900) and ideally 4 (850). - Eric -

To: mightylakers who wrote (118696)	5/12/2002 12:07:50 PM
From: kech	Respond to of 152472

The discussion of forward and backward compatibility so far has focused on GSM/WCDMA compared to 1X/1XEVDO. Since GPRS and EDGE are only for data it seems like the analogy of 1X/1XEVDO is more directly compared to the voice/data combo of GSM/GPRS or GSM/EDGE. In these cases, voice channels do have to be sacrificed to get data. The issue seems to hinge on how much voice capacity is lost relative to the gain in data. Since WDCMA is on new spectrum, this issue doesn't come up. But it does come up in another backward compatability issue - TDMA/GSM at the same time that GSM/GPRS is going on. For spectrum starved Cingular during peak commuting time this is going to be a nightmare. They will lose channels just to get voice on GSM, then lose additional channels to get data. This is just for the 2 to 2.5 g transition. This does not happen for CDMA IS-95 to CDMA 1X, in fact, more capacity is freed up. This is the nub of the backward compatability issue, and is not simply "solved" by the presence of multi-mode handsets.