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Thread: Novatel Ovation MC950D Fails/Hungs Intermittently

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    Re: Novatel Ovation MC950D Fails/Hungs Intermittently

    EDIT: tech info added

    Quote Originally Posted by nhoeller View Post
    Mar 29 13:02:59 300PL kernel: [142120.140359] usb 1-2.4: USB disconnect, address 23
    Mar 29 13:02:59 300PL kernel: [142120.143494] option 1-2.4:1.0: device disconnected
    Mar 29 13:02:59 300PL kernel: [142120.145360] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
    Mar 29 13:02:59 300PL kernel: [142120.155013] option 1-2.4:1.1: device disconnected
    Mar 29 13:02:59 300PL pppd[15345]: Modem hangup
    Mar 29 13:02:59 300PL pppd[15345]: Connect time 307.2 minutes.
    Mar 29 13:02:59 300PL pppd[15345]: Sent 2831521 bytes, received 16614180 bytes.
    Mar 29 13:02:59 300PL pppd[15345]: Connection terminated.
    Mar 29 13:02:59 300PL pppd[15345]: Exit.
    Mar 29 13:02:59 300PL kernel: [142120.561284] usb 1-2.4: new full speed USB device using uhci_hcd and address 24
    Mar 29 13:02:59 300PL kernel: [142120.601593] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
    Mar 29 13:02:59 300PL kernel: [142120.691916] usb 1-2.4: configuration #1 chosen from 1 choice
    The above seems to be a h/w reset caused by the modem (circuit or firmware) or a momentary power loss. The modem did not stuck (brown out) but restarted and recognized by the system. Also the system rearranges /dev/ttyUSBx starting from 0 because wvdial exited normally. In another case the connecting program stuck holding the /dev/ttyUSB0 resulting in a rearrangement to /dev/ttyUSB1 & 2

    If the above caused by a power problem could be fixed with the patched cable.

    Quote Originally Posted by nhoeller View Post
    --> Disconnecting at Mon Mar 30 11:35:11 2009
    --> The PPP daemon has died: A modem hung up the phone (exit code = 16)
    --> man pppd explains pppd error codes in more detail.
    --> Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.
    --> Auto Reconnect will be attempted in 5 seconds
    --> Cannot open /dev/ttyUSB0: No such file or directory
    --> Cannot open /dev/ttyUSB0: No such file or directory
    --> Cannot open /dev/ttyUSB0: No such file or directory
    --> Disconnecting at Mon Mar 30 11:35:11 2009
    ...
    ...If I run wvdial while the modem is in its 'madly blinking' state, I get back

    --> Cannot open /dev/ttuUSB0: Device or resource busy.

    I tried running minicom against the port - it hung 'Initializing Modem'. Killing minicom caused it to hang 'Resetting Modem'. Rebooting Ubuntu did not help because power to the USB port never dropped.
    In the above case the modem is in an ERROR state with its firmware knowing or not this Error condition (the 'madly blinking' could be random or a status). We are sure that power removal is a solution.

    Quote Originally Posted by nhoeller View Post
    From your understanding of USB cables, is that all I need to do, or do I need to open/close all four leads?
    The best is to open/close at least 3 leads (V+ and data). As it is simpler to open/close only the V+ (red cable) you have to try it. If the modem is well designed will reset fully even if the line driver has data signals.

    Finally Init2 = AT&FE0V1X1&D2&C1S0=0 it is very good because of AT&F which restores factory defaults, useful when using the modem with windows where we don't know the exact settings (via control panel you can enable and check the modem log file to see some of them).

    Using minicom you can try AT&F then ATZ and AT&V to see factory default settings.
    (minicom -s starts minicom without initializing showing the main menu)

    Regards,
    George
    Last edited by GeorgeVita; March 30th, 2009 at 09:04 PM.

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