I have an old MC7710 that I cannot bring online with AT+CFUN=1.
ATI Manufacturer: Sierra Wireless, Incorporated Model: MC7710 Revision: SWI9200X_03.05.29.03ap r6485 CNSHZ-ED-XP0031 2014/12/02 17:53:15 IMEI: XXXXXXXXXXXXXXXXXXXXXX IMEI SV: 23 FSN: XXXXXXXXXXXXXXXXXXXXXX 3GPP Release 8 +GCAP: +CGSM,+DS,+ES OK AT+CFUN? +CFUN: 0 OK AT+CFUN=1 ERROR
Debugging the issue, I found there is a Volt:1 LPM force flag reported, and High Critical Volt state:
AT!PCINFO? State: 0 (LPM) LPM force flags - W_DISABLE:0, User:0, Temp:0, Volt:1, Auth:0 W_DISABLE: 0 Poweroff mode: 1 LPM Persistent: 0 OK AT!PCVOLT? Volt state: High Critical Power supply voltage: 3607 mV (139 cnt) OK
The module is connected with a miniPCI to USB adapter to the PC.
I don’t understand the problem and the errors reported. Is the module receiving more voltage than expected from the USB port? Is this a hardware issue with the miniPCI adapter that is not limiting the power to 3.3V correctly before passing it to the module?
I know this module is old and unsupported, but the
PCVOLT? commands are still used in all new modules. We’re trying to add some automatic problem detection logic based on those, but we need to understand the issue first.