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I installed Ubuntu 14.04 on a HP dv6 laptop.

I connect to the Internet via a 3G EVDO USB modem (CDMA) of Capitel make from BSNL Kolkata, device id 1c9e:9e00. Making this modem get detected by Ubuntu needs an extra step since Ubuntu 12.04. I have to type in at the terminal: sudo modprobe usbserial vendor=0x1c9e product=0x9e00 and after waiting a bit the modem shows up in the Network Manager list, from where I use Edit Connections to type in the username and password.

The modem does connect to the internet but this time I noticed that the speed is limited to 123 kBps instead of the 300 kBps that I get when using Windows 7 or Windows 8.

This problem was not there, as far as I am aware, in previous versions of Ubuntu. This speed limitation of 123 kBps also exists in Linux Mint 17 (both Cinnamon and Mate).

How do I go about diagnosing what is actually causing this 3G modem to limit its speed to 123 kBps when used in Ubuntu 14.04?

1 Answer 1

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I tried this method for my BSNL EVDO (PRITHIVI UE100): First connect the device to your laptop/PC. Run the command

ls /dev/tty*

There should be a device ls /dev/ttyACM0 (or a name similar to that) To verify, remove the device and run ls /dev/tty* again to check that device has vanished :)

Now you need a nifty program called 'wvdial' install it using

sudo apt-get install wvdial

After wvdial has been installed we need to provide a configuration file for wvdial. Create one using

sudo gedit /etc/wvdial.conf

Enter the following data into the file

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
Baud = 460800
Modem = /dev/ttyACM0
ISDN = 0
Phone = #777
Password = xxxxxxxxxx
Username = xxxxxxxxxx
Stupid Mode = 1

If your username and password are the mobile numbers (then replace xxxxxxxxxx with your device mobile number with prefix-91 for example 91xxxxxxxxxx)

If you don't know username and password, or the above do not work then you can use this ... (I have used it)

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
Baud = 460800
Modem = /dev/ttyACM0
ISDN = 0
Phone = #777
Password = 165
Username = 165
Stupid Mode = 1

Now run this command (2-3 minutes after you have plugged in the device) to ensure this is working

sudo wvdial

It should show some DNS servers, (your notification area won't show any connected network) . Open browser and see if pages load. If it does, and I believe it will, then it's good to go. Now if you are a geek you can just enter sudo wvdial every time to connect, but for people you prefer the comfort of mouse clicks you have some more jobs left to do.

sudo gedit /usr/bin/bsnl

enter this data into that file

gksudo wvdial

Now we need to set execution permissions to the file

sudo chmod 777 /usr/bin/bsnl

Now we will create a desktop shortcut.

gedit ~/Desktop/BSNL.desktop

and enter this data into the file

 [Desktop Entry]
Name=BSNL EVDO Connection
Exec=bsnl
Type=Application
StartupNotify=false
Icon=package_network

and make it executable

chmod 777 ~/Desktop/BSNL.desktop

Now everytime you plug in the device, wait for 1-2 minutes, then double click the brand new icon on your desktop, and woot!! you are online :)

cheers

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