Thanks for the tip on ip address. I returned the Nokia router and instead got the Alcatel I-240G-D. So, I am in the same boat as you now. I wasn't able to login into the router. There is a telnet interface running but it did not accept any username and passwords i gave to it. I did a hard reset too, but it did not help.
I can confirm the Alcatel router does have gigabit ports.
I have tried to chase Airtel for the username and password, but haven't been successful so far. Perhaps, you can raise a complaint too.
I am not keen on a modem with a closed interface from a security point of view.