Hello Mr. Vikram,
I have similar problem with my DELL Vostro 1015.
I recently changed my router from G to N type (300Mbps at 2.4GHz ) . My Vostro uses Dell Wireless 1397 WLAN Mini Card, which is G and it's some how incompatible with my N router. The connection (link) speed is 54Mbps, but I can only get 3-4Mbps throughput from the wireless. My new N router is cheap Tenda, but it's the same situation when I tried with N router from TP-Link and Cisco.
I have two questions for you.
Is it possible to fix the incompatibility issue by changing some settings of the driver or the HW module? I'd be happy if I could use half of bandwidth, like it was with my old G router.
To which Dell Wireless Wlan card, that supports N connection speed, can I upgrade my laptop? Is 1510 compatible?
Thanks,
Dim