If your friend's modems shows the link speed as 10Mbps, then the problem is with your modem. Either your modem is not good or ADSL Modulation mode is not set to ADSL2+ in your modem.I talk to them they tried everything they even came to my home and tested in my pc then they said your modem is very old(more than 15 years old)try with new modem then i tried with my friend modem and link speed shown as 10mbps.