mine too - no upgrade here as well
Mine is 1996 UP/ 494 DN
I registered a complaint regarding the low bandwidth and the exchange in charge [broadband] called me and said, despite BSNL announcing an upgrade to 4mbps, they don't have the necessary infrastructure [cables and all] to support bandwidth in excess of 2mbps.
He said that even with an 8mbps plan, we won't be getting any higher speeds than 2 mbps.
Not sure whether this is true or not. I guess I'll just wait till the next month to see whether there is any upgrade happening
Your speed won't go above 2 mbps until ur line rate is not upgraded to 4096 kbps downstream.
Regarding line capability, check ur Attainable Rate in ur modem, this is speed ur line is capable of carrying. If it is above 4 mbps then it just need an upgradation on ur a/c from the technical team of NIB, evrything else is just pure laziness & lame excuse from the Exchange guyz.