OpenMoko/GTA01 project advice

Andreas Kostyrka andreas at kostyrka.org
Sat Jul 28 01:29:23 CEST 2007


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Nelson Castillo wrote:
> On 7/27/07, Andreas Kostyrka <andreas at kostyrka.org> wrote:
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>>> * Will we be able to use the GSM directly? I am new to
>>> this, and I'd like to know if we can make a GSM call
>>> (to other Neo) and send arbitrary data.
>> Yes and no. You cannot make a Voice call and send arbitrary data. You
>> can make a data call (so called CSD) and send arbitrary data. Trouble is
>> that this is clearly visible to the operator as the call is signaled
>> differently, so if you are trying to avoid data call costs, it's not
>> possible.
> 
> We didn't know about CSD. Good. We are not trying to avoid any cost. We
> just care about the latency of the GPRS link which renders it rather unusable,
> at least in our country.

I don't think that the latency of CSD is much better than the GPRS one.
Plus CSD means 14400 bits per second at absolute best.

Andreas

> 
>> As a mental model, you can think of the Neo as an Linux/ARM based PDA
>> with an embedded GSM modem.
> 
> :)
> 
> Regards.
> 
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