USB Modem issue

[Karl F. Larsen]

Tommy Trussell wrote:
> On Sun, Jan 18, 2009 at 1:30 PM, Sundar Dhanasekaran
> <sundar261 at gmail.com> wrote:
>   
>> Hi,
>>
>> I am using USB datacard on my Ubuntu 8.04.  I am able to connect and use
>> the internet services.  But when the connection fails, I am not able to
>> connect back without rebooting the system.  The modem does not seem to
>> be identified.  Not sure why.
>>
>> Error I get -
>>
>> --> WvDial: Internet dialer version 1.60
>> --> Cannot get information for serial port.
>> --> Initializing modem.
>> --> Sending: ATZ
>> --> Sending: ATQ0
>> --> Re-Sending: ATZ
>> --> Modem not responding.
>>
>> $lsusb
>> Bus 005 Device 001: ID 0000:0000 Bus 004 Device 001: ID 0000:0000 *Bus
>> 003 Device 003: ID 12d1:1001 Huawei Technologies Co., Ltd. E620 USB Modem*
>> Bus 003 Device 001: ID 0000:0000 Bus 002 Device 001: ID 0000:0000 Bus
>> 001 Device 001: ID 0000:0000
>>
>> Any pointers on why I have to reboot and how to avoid it?
>>
>> -Sundar
>>     
>
> It sounds like the modem isn't "handshaking" properly, or it doesn't
> return to command mode when it should.
>
> You didn't say exactly what model modem you are using, but from your
> lsusb dump it looks like you have a Huawei.  I see some Ubuntu
> documentation for a Huawei E220
> https://help.ubuntu.com/community/DialupModemHowto/Huawei/E220
>
> It looks like the recommended initialization strings are different
> from the ones you are using, so you might try making your wvdial
> configuration look like the examples -- notice especially the line
> that says "Init2 = ATQ0 V1 E1 S0=0 &C1 &D2" -- some of those parts
> after ATQ0 are probably important for its correct operation.
>
>   
    You didn't say your using a Serial to USB converter. But your error 
message assures me you are. These converters are poor at best. This is 
your problem I think and better just live with the problem.

Karl


-- 

	Karl F. Larsen, AKA K5DI
	Linux User
	#450462   http://counter.li.org.
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