wvdial fails with "NO CARRIER" on GPRS/EDGE (works fine on 3G)

karolis · 07-07-2013, 10:53 AM

Hey,

I've been googling around for 10 hours or so and getting pretty desperate.

I have a Huawei K3765 USB modem and a debian linux PC (alix board). It is working fine for a year or 2. I've been using different carriers in different countries and it has never let me down as long as there was a 3G connection.

Now I have moved to a location where 3G is not available. Only options are GPRS/EDGE. And the modem doesn't connect. It did connect fine to the same carrier in a different location, which has 3G available.

The output from wvdial is usually similar to this:

Code:

#wvdial

--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
NO CARRIER
--> No Carrier!  Trying again.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
NO CARRIER      

...

It seems that the problem is that 3G isn't available and the modem can't use 2G for some reason.

my wvdial.conf is as follows:

Code:

[Dialer Defaults]
Modem = /dev/ttyUSB0
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Stupid Mode = on
Modem Type = Analog Modem
Phone = *99#
New PPPD = yes
ISDN = 0
Username = blank
Password = blank
Baud = 9600

The same modem with the same card works fine on Windows using Mobile Partner.

Any help would be appreciated.

thanks,
Karolis

pierre2 · 07-08-2013, 05:34 AM

try updating your modewitch, as per:-
http://www.zoringroup.com/forum/view...php?f=6&t=4077

karolis · 07-08-2013, 05:58 AM

Quote:

Originally Posted by pierre2

try updating your modewitch, as per:-
http://www.zoringroup.com/forum/view...php?f=6&t=4077

Hi,

thank you for your answer.

The dongle is recognized properly as modem and 3 tty interfaces are created:

Code:

# ls /dev/ttyUSB*
/dev/ttyUSB0  /dev/ttyUSB1  /dev/ttyUSB2

As I mentioned, the same usb dongle works fine on the same carrier using 3G but not 2G.

I have installed usb-modeswitch and usb-modeswitch-data as debian packages and I would like to keep it that way unless I absolutely have to install from source. Do you think installing from source would make a difference? If yes, why?

Karolis

karolis · 07-08-2013, 06:02 AM

Sometimes (seems to be random) instead of throwing "NO CARRIER" message, wvdial starts pppd which later dies:

Code:

# wvdial
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Sending: AT+CSQ
AT+CSQ
+CSQ: 18,99
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
--> Carrier detected.  Starting PPP immediately.
--> Starting pppd at Sun Jul  7 17:55:01 2013
--> Pid of pppd: 2794
--> Using interface ppp0
--> pppd: œÉ[08][10]–É[08]hÉ[08]
--> pppd: œÉ[08][10]–É[08]hÉ[08]
--> pppd: œÉ[08][10]–É[08]hÉ[08]
--> pppd: œÉ[08][10]–É[08]hÉ[08]
--> pppd: œÉ[08][10]–É[08]hÉ[08]
--> pppd: œÉ[08][10]–É[08]hÉ[08]
--> Disconnecting at Sun Jul  7 17:55:03 2013
--> 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

then in /var/log/messages:

Code:

Jul  7 17:55:01 alix pppd[2794]: pppd 2.4.5 started by root, uid 0
Jul  7 17:55:01 alix pppd[2794]: Using interface ppp0
Jul  7 17:55:01 alix pppd[2794]: Connect: ppp0 <--> /dev/ttyUSB0
Jul  7 17:55:01 alix pppd[2794]: CHAP authentication succeeded
Jul  7 17:55:01 alix pppd[2794]: CHAP authentication succeeded
Jul  7 17:55:02 alix pppd[2794]: Modem hangup
Jul  7 17:55:02 alix pppd[2794]: Connection terminated.
Jul  7 17:55:02 alix pppd[2794]: Exit.