i have two connections in my home, a 4mbps ptcl. and my uncle has a 2mbps LDN connection.... my ptcl 4mb connection syncs to ADSL 2+ and gives me very good pings, whereas the LDN connection takes 40ms just to reach their hub in islamabad, my ptcl connection takes 38ms to reach karachi :S
and the LDN connection wont sync to any other mode besides adsl gdmt on an interleaved path.... SnR and attenuation is good on both connections but why so much difference, especially in syncing to adsl2+ ......
here is LDN's speedtest:
here is ptcl's speedtest: