Thanks to this forum & members. The above combination ( modem & router) does work for Chennai Bsnl fibre. But the speed I get is less than 10Mbps both upload & download. Ping is 7ms & Jitter is 2ms. Tried with fast.com & Bsnl speed Test . kindly let me know how to get 50Mbps or at least 80 percent of that . should there be any change in setting. thanks. By the way how to attach photo in this post .