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Hello I am experiencing periodic disconnections, once every hour or 2, while looking into kernel log it looks like mobile modem is periodically detached and re-attached to ttyUSB. Using only SIM1.  

I am unsure these ttyUSB disconnections affect MODEM 1 (as it seems modem 1 is USB0 to 3). Is this a normal mechanism related to Modem 2 which is not supplied with a SIM ?  Can you help looking what is going on and try understand if the disconnections are related to HW or network ? 

This issue drops the online conference sessions randomly..

------- SYSTEM -----

HARDWARE REVISION0303

BATCH NUMBER0001

PRIMARY MODEM

MODELEG06

IMEI868759032103493

FW VERSIONEG06ELAR03A05M4G

SECONDARY MODEM

MODELEG06

IMEI868759032101307

FW VERSIONEG06ELAR04A04M4G

SYSTEM

FIRMWARE VERSIONRUTX_R_00.02.05.2

KERNEL VERSION4.14.171

-------- FROM KERNEL LOG -------

This is just an extract, I have more than 12 iterations in 48 hours runtime

[15194.315212] usb 3-1: USB disconnect, device number 2

[15194.315714] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4

[15194.319534] option 3-1:1.0: device disconnected

[15194.327708] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5

[15194.331769] option 3-1:1.1: device disconnected

[15194.340899] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6

[15194.344090] option 3-1:1.2: device disconnected

[15194.352571] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7

[15194.356690] option 3-1:1.3: device disconnected

[15194.449162] qmi_wwan 3-1:1.4 wwan1: unregister 'qmi_wwan' usb-xhci-hcd.1.auto-1, WWAN/QMI device

[15206.358874] usb 3-1: new high-speed USB device number 3 using xhci-hcd

[15206.573609] option 3-1:1.0: GSM modem (1-port) converter detected

[15206.573960] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB4

[15206.579588] option 3-1:1.1: GSM modem (1-port) converter detected

[15206.585788] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB5

[15206.592955] option 3-1:1.2: GSM modem (1-port) converter detected

[15206.598717] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB6

[15206.605179] option 3-1:1.3: GSM modem (1-port) converter detected

[15206.611659] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB7

[15206.637036] qmi_wwan 3-1:1.4: cdc-wdm1: USB WDM device

[15206.638814] qmi_wwan 3-1:1.4 wwan1: register 'qmi_wwan' at usb-xhci-hcd.1.auto-1, WWAN/QMI device, 72:84:4c:a2:20:0d

[25257.721590] usb 3-1: USB disconnect, device number 3

[25257.722108] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4

[25257.726017] option 3-1:1.0: device disconnected

[25257.734148] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5

[25257.738125] option 3-1:1.1: device disconnected

[25257.746937] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6

[25257.750609] option 3-1:1.2: device disconnected

[25257.758959] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7

[25257.763077] option 3-1:1.3: device disconnected

[25257.899511] qmi_wwan 3-1:1.4 wwan1: unregister 'qmi_wwan' usb-xhci-hcd.1.auto-1, WWAN/QMI device

[25269.798911] usb 3-1: new high-speed USB device number 4 using xhci-hcd

[25269.997562] option 3-1:1.0: GSM modem (1-port) converter detected

[25269.997886] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB4

[25270.003345] option 3-1:1.1: GSM modem (1-port) converter detected

[25270.009848] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB5

[25270.016667] option 3-1:1.2: GSM modem (1-port) converter detected

[25270.022728] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB6

[25270.029071] option 3-1:1.3: GSM modem (1-port) converter detected

[25270.035696] usb 3-1: GSM modem (1-port) converter now attached to ttyUSB7

[25270.061107] qmi_wwan 3-1:1.4: cdc-wdm1: USB WDM device

[25270.062638] qmi_wwan 3-1:1.4 wwan1: register 'qmi_wwan' at usb-xhci-hcd.1.auto-1, WWAN/QMI device, 72:84:4c:a2:20:0d

1 Answer

0 votes
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Hi,

You're right, this isn't normal and we had several devices having this issue - if it's one of many devices - just return it to the reseller, but before that try these options:

- Swap SIM card into another SIM tray slot.

- Update your firmware to the latest one, because I see you're not on it.

- Try resetting the device.

If the issue is still there - return it to the reseller and ask for a replacement.

EB.
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Okey will try. thx