OS: Linux 
Handset: Z020 ( Anydata )
Cable: Direct USB

If your current version of Linux has the USBSerial driver compiled into it, then you're ready to start. If it has the driver built as a module (most of the Linux distributions use this method), then you'll have to enable the driver with the following command:

#rmmod usbserial
#modprobe usbserial vendor=0x16d5 product=0x6501

Now that you've got the driver loaded, you need to set up the device node
(in /dev) for the modem. You can use up to 32 modems with this driver, but
most people will only need to configure one. To set up a modem, use the
following command:

Test if it is already in system:

#ls -l  /dev/ttyUSB0

Create device nod :

#mknod /dev/ttyUSB0 c 188 0


Download linux-anydata.tar.gz 
Copy the files from archive (linux-anydata folder) to your linux /etc/ppp.

source files:
linux-anydata/chap-secrets
linux-anydata/chat-anydata
linux-anydata/dialevdo.sh
linux-anydata/ppp-down.sh

Note: overwrite the files (you may want to make a backup of the old files)

To bring the PPP connection up:
go to /etc/ppp folder and run
#./dialevdo

For DNS resolution :
#mv /etc/resolv.conf /etc/resolv.conf.old
#ln -s /etc/ppp/resolv.conf /etc/resolv.conf

For disconnect :
go to /etc/ppp folder and run
#./ppp-down.sh