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< Esato Forum Index > Sony Ericsson / Sony > Technical > someone asked me a question about cdma/iden/gsm. is this a good reply? Bookmark topic

it was on a blackberry forum (i was trying to get help with it, which BTW i am getting rid of)

I assume that trying firmware made for a GSM device, such as the 7100i and putting that on the 7130E (CDMA), won't work?

someone said no it wont, and he asked why. my awnser:

GSM has 4 different frequencies (850,900,1800,1900 i believe), and CDMA and iDEN use a complete different set of frequencies. Lets say the CDMA frequency bands are called X and iDEN frequencies are called Y, and GSM are the numbers i listed. If you have a GSM phone, the software/firmware/OS on the GSM phone will only work with the 850,900,1800,1900 bands. so if you add CDMA software to a GSM phone, it wont work, becuase the X (or Y) frequency will not be supported by the GSM device.

If you know anything about remote control cars, its like how you can be messing with 2 cars with RF, and the MHz is different, so you can control both at the same time. and they wont get mixed up. HOWEVER every once and awhile you get a remote that can control 2 cars (which would be the GSM devices, becuase 4 frequencies).

another solution, if you know anything about HTML, C++ or any computer language, its like trying to program a program in pure HTML


does it make sence at all? i could have typed SOOOO much more i know, but i got sick of trying to explain it.
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Posted: 2006-04-05 21:13:26
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hehe.. i dunno bout the iden..cdma comparison but the C++..html one was cracking
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Posted: 2006-04-05 23:43:00
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in gsm, each phone has two unique frequencies assigned to it for sending and receiving audio. In cdma, all the phone are on the same smaller freq. spectrum with separate time slots for each phone.
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Posted: 2006-04-10 19:18:10
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Quote:
On 2006-04-10 19:18:10, niranjan007 wrote:
in gsm, each phone has two unique frequencies assigned to it for sending and receiving audio. In cdma, all the phone are on the same smaller freq. spectrum with separate time slots for each phone.


and to be even more precise they are not assigned two frequencies for uplink/downlink since GSM uses frequency hopping so the frequency is changed 217 times per second... ok... it's possible to use GSM without frequency hopping, but it's probably not many providers that uses it without hopping.
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Posted: 2006-04-10 23:14:49
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CDMA networks can carry either GSM or UMTS services (depending what they are designed for).

GSM is the most common, but the newer UMTS system is more efficient and usually uses higher frequencies, and has a higher data throughput than GSM. GSM generally tops out at about 144Kbps when using EDGE (although 237Kbps is possible). UMTS generally tops out at about 384Kbps. These figures are general only, both systems have higher theoretically possible speeds. EDGE can achieve 384Kbps, and with enhancements up to 2MBits/s. Some UMTS systems (based on WCDMA networks) can achieve up to 10Mbits/s throughput!
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Posted: 2006-04-11 01:13:54
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