[Gta04-owner] 3G internet connection

[Dr. H. Nikolaus Schaller]

Am 25.04.2013 um 23:42 schrieb Gilles Filippini:

> Adrien Dorsaz a écrit , Le 24/04/2013 11:08:
>> As written last year in this thread[1], I'd prefer to set "AT_OPSYS=3,2"
>> so if 3G network is bad, the modem switch to 2G. Does anybody else uses
>> this configuration ?
> 
> With "AT_OPSYS=3,2" or "AT_OPSYS=3" (BTW, what is the ",2" for?) I

I think the first parameter has this encoding:
0	GSM only
1	UMTS only
2	GSM has priority if both are available
3	UMTS has priority if both are available

the second parameter:
0	circuit switched only (i.e. GSM 9600)
1	packet switched only (i.e. GPRS/UMTS)
2	circuit or packet switched
3	no preference (whatever this means compared to ,2)

This would indicate that AT_OPSYS=3,3 would be the best choice.

Using AT_OPSYS=3,0 could make the UMTS connection fail (there
is no UMTS circuit switched mode), but I have not tried.

> experience far too many modem-reenumerate.
> 
> I had to revert my config to "AT_OPSYS=1,2" which seems more stable.

-- hns