Look at this Link. They only tested tataphoton on RHEL 3 and several other version, but wait what about user having RHEL5.
This is very straight forward Article about getting usb modem to work on linux. The most annoying part is usb_modeswith utility. Download usb_modeswitch-0.9.4.tar.bz2 ready made source of this utility .
When you plug tataphotone USB modem in RHEL 5, by default it will consider it as SCSI Storage device (that’s what happen to me) , But to make it work it must be convert into Serial device so that it can act as USB modem.
To convert back to USB serial modem, blacklist both driver (i.e. scsi_mod, usb_storage). Add this entry to /etc/modeprobe.d/blacklist file and reboot the system. After reboot load usbserial driver by issing command “modprobe usbserial vendor=vid product=pid”, where vid and pid can be found from lsusb command, and do “dmesg” you will see something like
usbcore: registered new driver usbserial
drivers/usb/serial/usb-serial.c: USB Serial support registered for generic
Now issue command usb_modeswitch -v 0x12d1 -p 0x140b -d 1 then usb_modeswitch -v 0x12d1 -p 0x140b -H 1. You will able to see ttyUSB{0-4} in your /dev directory. That’s it, You are good to go. Now type wvdialconf /etc/wvdial.conf it will generate wvdial.conf in etc directory and then finally wvdial, now make change in wvdial.conf and you will be able to surf Internet.
This is just a middle part of working Tataphoton+ under Linux, which lacks in many forum/blogg/article. More on wvdial, lsusb, usb_modeswitch, you’ll find in many article. I just share my experiance How i make Tataphoton work under RHEL 5 Linux.
Hope it will Help you and save your time.
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Happy Surfing.