R: Re: R: Layer23 missing

Luca Bongiorni luca.bongiorni1 at studenti.unimi.it
Fri Sep 30 12:32:50 UTC 2011

Hi Bogdan,

> I've used all types of phones and different networks - same result. If I capture the uplink then every time after a 
> few seconds I get "segmentation fault". My guess is that in a controlled environment it's going to work, but with a live one, where you have a 
> lot of arfcn (on a quick scan I get about 50 on my location) it's unlikely to work. 

well, the success could depends from many things:
- wich cable are you using: FTDI or CP2102;
- which phone you have tried: sometimes the jack on C1xx could be not so clean or used and it could create problems of communication at high baudrates.
- the environment that you are using: public network, as i saw from my tests, is quite horrible to make tests (eg. arfcn hopping).

Using a DP-L10 and modifying the AFC value, seems to work well on public netwroks, even if, sometimes it get stuck: problem related with channel hopping/sync IIRC.

I used a Blackberry Test Field to disable EDGE and identify which ARFCN that doesn't hop on GPRS: ( eg. this one is hopping, others may not [1] ) 

Obviously a private and controlled environment could give you the full percentage of success.


[1] http://tinyurl.com/gprs-hopping

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