Dasher on OpenMoko?

Schmidt András asch at freemail.hu
Fri Feb 29 17:50:58 CET 2008

Hi Charles,

I am not sure I understand your post clearly. You want to access a 
telephone-modem using the GSM line of the OpenMoko (not an ADSL modem)?

I am not an expert on this technology but I believe that is not possible.
Modem's are designed to work over analog lines. They also work on 
digital lines which use about 8KHz mu-law or A-law encoded samples. 
That's a standard digital telephone line with bandwith of 64KBit/s . GSM 
is completely different. GSM uses a lossy compression algorithm for 
encoding voice so it uses 13KBit/s (or even less when there are bad 
signal conditions). The GSM codec is optimized for human voice not for 
music or modulated signs of a modem. That makes a GSM line totally 
unusable for a modem connection. The bandwidth of the GSM connection can 
be used directly to transfer digital data but that is another technology 
that has no connection with analog modem's.

Schmidt András

Charles Edward Pax wrote:
> Hi, all. This is my first post, but I've been trying to follow 
> neo/openmoko development for a while. I have a few questions
> Has anyone used gotten dasher running on OpenMoko?
> Is it possible to use a mobile phone to dial in to a dialup number 
> I can use with a regular modem? My university has free dialup access 
> and my mobile phone operator gives me unlimited minutes on evenings 
> and weekends. I don't want to spend the extra money on a data plan, 
> but I would like to have internet access on the go. I've tried to set 
> this up with the phone I currently have, but it doesn't work.
> I suspect that it could be some sort of locked feature. I would purchase
> a new phone if it meant this would work. My ideal situation is to
> connect my powerbook to my mobile phone via bluetooth and connect my
> phone to my university via a regular dialup number. Any information
> would be greatly appreciated. Thanks.
> -Charles Edward Pax
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