Data over normal GSM call
ramsesoriginal at gmail.com
Thu Apr 10 22:55:17 CEST 2008
By applying some sort of modulation (fm? am? psm?) it should be
possible to transfere data over gsm, but on a much lower speed then
through the data channel.
On Thu, Apr 10, 2008 at 7:34 PM, Harald Welte <laforge at openmoko.org> wrote:
> On Tue, Apr 08, 2008 at 10:22:10AM -0400, Dan Staley wrote:
> > Does anyone know if it is legal (in the standard TOS) with providers
> > (such as ATnT) to send data over a normal phone call?
> this is not possible, since regular voice calls for GSM are not
> bit-transparent, i.e. the voice signal is coded and potentially re-coded
> (transcoded) a number of time between the calling and receiving party.
> Data calls over GSM are done using CSD. They also use quite a lot more
> error correction than voice calls.
> - Harald Welte <laforge at openmoko.org> http://openmoko.org/
> Software for the world's first truly open Free Software mobile phone
> Openmoko community mailing list
> community at lists.openmoko.org
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