STEVELVL
I just wanted to make sure you got your answer:
https://www.phonescoop.com/carriers/forum.php?fm=m&f ... »
https://www.phonescoop.com/carriers/forum.php?fm=m&f ... »
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yesit would apear wcdma can hand off to gsm. but what we have also learned is cdma can hand off to amps and they are still not backwards compatable.
an evdo phone is backwards compatable. if you take an evdo phone with a straight evdo chip in it it will work on an old is-95 network just fine.
if you take a wcdma phone that has a stricktly wcdma chip it will not work on a gsm network. they have to put a special thing in the chip to make it work on gsm.
an evdo phone is backwards compatable. if you take an evdo phone with a straight evdo chip in it it will work on an old is-95 network just fine.
if you take a wcdma phone that has a stricktly wcdma chip it will not work on a gsm network. they have to put a special thing in the chip to make it work on gsm.
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CDMA can hand seamlessly off to AMPS? Since when? If it can, then I must be living in the dark.
We'll settle at this:
CDMA and AMPS are not backwards compatable, period. Simply because you cannot benefit from having both technologies at once while in a call.
WCDMA and GSM are backwards compatable through dual-tech chipsets. Simply because you can benefit from both technologies while in a call.
EVDO is fully backwards compatable with IS-95. Simply because it is essentially the same technology.
We'll settle at this:
CDMA and AMPS are not backwards compatable, period. Simply because you cannot benefit from having both technologies at once while in a call.
WCDMA and GSM are backwards compatable through dual-tech chipsets. Simply because you can benefit from both technologies while in a call.
EVDO is fully backwards compatable with IS-95. Simply because it is essentially the same technology.
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You are living in the dark ages. Roaming on Verizon, my SPCS Nokia 3588i seamlessly goes from CDMA to AMPS and back in Western US areas.
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So during a call that originated in CDMA coverage and tavels into an AMPS-only coverage, your call isn't dropped? I don't believe it, but whatever you say.
I've never once seen it done.
I've never once seen it done.
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🙂 Out west, not in populated areas, the towers are about 10 miles apart. Within 3 miles of the tower, CDMA is in effect, then it seamlessly switches to AMPS, then back to CDMA as you get closer to the next tower. In other words, for about 6 miles I have CDMA and 4 miles AMPS. It is easily distinguishable by the fidelity of the call when in AMPS. I have a hunch this only works with an 800 mhz CDMA/AMPS pair. As SPCS says, if you are on SPCS and you get to the 'end' of the signal, the call will drop-it's 'tough' to find a 2100 mhz AMPS signal. 😉
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stevelvl said:
if you take a wcdma phone that has a stricktly wcdma chip it will not work on a gsm network. they have to put a special thing in the chip to make it work on gsm.
If you take a EVDO phone that has a strictly EVDO chip it would not work on a CDMA network either. They have to put a "special thing" in the chip to make it work on CDMA for voice, because EVDO is strictly data.
Any way you look at it, new techonologies are going to require dual-tech or multiple chipsets altogether.
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RUFF1415 said:
If you take a EVDO phone that has a strictly EVDO chip it would not work on a CDMA network either. They have to put a "special thing" in the chip to make it work on CDMA for voice, because EVDO is strictly data.
Any way you look at it, new techonologies are going to require dual-tech or multiple chipsets altogether.
actually no the evdo chips have both voice and data. ev-do is a little miss leading. what it means is the cdma network has had only the data portion upgraded. not the voice portion. in fact evdo is little more then a softrare upgrade top the network. which is why it is fully backwards compatable. wcdma however is a hardware upgrade. why? because wcdma is a compleatly differen...
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hey stevelvl if u want to settle this with ruff just list the hardware componets that mak up gsm then the stuff that makes up gprs and then he can see that when wcdma gets added to the gprs side it will make it wcdma and all the have to do is take out gsm and wcdma will work on its own. now on cdma list those as well and he can see that all it is just simple upgrades that make evdo and rev-a work on a cdma network without major changes. if u dont have i can list them so it can put this (wcmda is a uprade to gsm crap) to bed. really wcdma is repalceing hardware on the gprs side and gprs has nothing to do with gsm.
🙂
🙂
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The discussion never once involved a suggestion that "WCDMA is an upgrade to GSM". The discussion was that WCDMA is the natural evlotion choice to GSM because of the very fact that they are compatable. Meaning, the two technologies work in tandem and can seamlessly hand off to one another. It only makes sense that WCDMA is the next step to take from GSM when they work so well with each other.
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stevelvl said:
gsm was great back in the day (80s) but now it just plain sucks. wcdma will replace it and wcdma will mostlikely have little or no advantage over evdo rev a.
WCDMA will have little advantage over EVDO rev. A, but no US carrier has slated plans to release WCDMA. Cingular's launch includes the HSDPA upgrade, and it will be interesting to see rev. A compete with that. With the following HSUPA upgrades, the only company in position to compete with data uplink and downlink speeds like that will be Sprint-Nextel.
stevelvl said:...
this is why china, russia india and every one who is any one out side of europe is switching off of gsm. in fact my prediction is that in 10 year
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