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Cellular forums Home > Archive > Cingular cell phone service > March 2007 > Re: Battery life claims
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Re: Battery life claims
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| cledus 2007-03-20, 12:33 pm |
| planetx wrote:
> I am a verizon customer, been thinking of switching to Cingular for
> sometime. I was curious, why are all the GSM phones purported to have
> phenomenal battery life. Many of the Motorola phones show 5 and 6+
> hours. How is that possible? My motorola phones I have own on verizon
> do not even come close.
>
It has to do with the modulation technology used by each company. GSM,
used by Cingular and many other operators, uses Time Division Multiple
Access (TDMA). Verizon and Sprint use Carrier Division Multiple Access
(CDMA). With TDMA, the transmitter is fully active only about 12 to 13%
of the time. So the average battery current is a little over 13%
relative to transmitting continuously. With CDMA, the transmitter is
active 100% of the time. CDMA also requires more "headroom" in the
power amplifiers to assure a very linear signal. So it is true that GSM
generally has much better battery life than CDMA under similar
conditions (e.g. distance from the transmitter, etc.). I have used both
technologies and GSM is the clear battery life winner in my experience.
I don't believe that you will be disappointed.
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| John Navas 2007-03-23, 4:33 am |
| On Tue, 20 Mar 2007 11:09:50 -0500, cledus <cledus@noemail.net> wrote in
<pHTLh.16234$bb1.8570@newssvr17.news.prodigy.net>:
>planetx wrote:
>
>It has to do with the modulation technology used by each company. GSM,
>used by Cingular and many other operators, uses Time Division Multiple
>Access (TDMA). Verizon and Sprint use Carrier Division Multiple Access
>(CDMA). With TDMA, the transmitter is fully active only about 12 to 13%
>of the time. So the average battery current is a little over 13%
>relative to transmitting continuously. With CDMA, the transmitter is
>active 100% of the time. CDMA also requires more "headroom" in the
>power amplifiers to assure a very linear signal. So it is true that GSM
>generally has much better battery life than CDMA under similar
>conditions (e.g. distance from the transmitter, etc.). I have used both
>technologies and GSM is the clear battery life winner in my experience.
> I don't believe that you will be disappointed.
True.
--
Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
John Navas <http://en.wikibooks.org/wiki/ Cingu...less_FA
Q>
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