Last couple of months I had trouble with my BSNL broadband connection. The problem happens after upgrading my BSNL connection to multiplay. Multiplay connection offers you Internet Protocol television and video-on-demand to its broadband customers. Ok, what ever it is, my broadband connection sucked. It restarts every few minutes and become stable after 15-20 minutes. Even it become stable it may reset again after some time, may be when you are downloading some files.
I probed about my friends and others those who have using BSNL broadband. But nobody has this situation. I checked my connection settings and my broadband line is perfect and SNR is proper. I replaced my old modem with new one. I replaced the NIC with new one. Nothing helped me to solve the problem.
I played with the connection settings again followed by http://www.indiabroadband.net discussion forum. I tried the below suggestion.
After logged into the broadband settings through 192.168.1.1 with the username and password. (By default BSNL broadband modem username and password will be admin/admin).
Login – > go to advanced setup -> go to DSL settings
Keep only GDMT/Glite/T413 Bitswap enabled.
Rest ADSL ADSL2+ etc uncheck.
I am not that techie to explain this. But this settings worked for me. Now no connection resetting. Now it is always on.

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congratulations Mr. Sunil . At last u win !!!!!!!!!