[Gta04-owner] Modem crashing?

Marcel Holtmann marcel at holtmann.org
Fri Feb 17 17:41:11 CET 2012


Hi Thomas,

> >> >> I think Radek's approach to monitor the PCM clock - which is only active
> >> >> during a (single) voice call - can address this. It may of course miss
> >> >> some signalling with a second call coming in during a first one
> >> >> (GSM conference calls).
> >> >
> >> > In fact i am now also doing CLCC polling in QtMoko. I will try to collect
> >> > numbers during weekend on how long talk time we have:
> >> >
> >> > 1/ with CLCC polling + routing audio
> >> > 2/ audio routing without CLCC
> >> > 3/ without audio and CLCC polling
> >> >
> >> > We can then decide what to do next.
> >> >
> >> > Btw if you write another mail to Option it would be nice to ask them if they
> >> > know how to disable 3G (if that is possible). I am quite sure the USB
> >> > disconnect is because of that.
> >>
> >> I'm pretty sure this works the same way as in any device:
> >> AT+CFUN
> >> where CFUN=5 is GSM and CFUN=6 UMTS
> >
> > that is just specific to Ericsson MBM and ST-Ericsson hardware. That is
> > nowhere near a standard. Time to read 27.007 ;)
> >
> > Option uses AT_OPSYS in their HSO based devices.
>
> You're right, it's not standard, so it probably is wise to use OPSYS for it.
> However, it does actually work on all devices I've ever seen,
> including every Qualcomm based, from Huawei to Option. So at least it
> does the job for quick testing :)

I don't know how you are doing your testing, but you are wrong here. For
Huawei CFUN=5 means something totally different. And it does not switch
to GSM only. It will actually fully disconnect you from any network.

Just as a hint, Huawei uses AT^SYSCFG for RAT and band selection.

Regards

Marcel




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