I recently opted for the 1Gbps plan but most of the time I'm only getting speeds of around 700-750MBPS with peaks of upto 850Mbps. Is this normal?
It doesn't really work that way. Doing that will get into ILL over GPON territory, which would cost you ~21Lakhs a year on BSNL.contact your LCO to provide dedicated port of 1GBPS to you.