yes i have airtel. i took screenshots of both 192.168.1.1 and 192.168.1.1/main.html SNR Margin seems to go down and then up again.
http://img100.imageshack.us/img100/1754/12989120ui0.jpg
http://img149.imageshack.us/img149/7118/67318793or0.jpg
http://img100.imageshack.us/img100/1754/12989120ui0.jpg
http://img149.imageshack.us/img149/7118/67318793or0.jpg