ADSL is cheaper than SDSL or Symmetric-DSL so it's mostly deployed for residential use everywhere because typical home users don't upload much unlike servers etc. So all DSLs to our homes are ADSLs by design. What I think is 256 kbps is too small a speed for an ADSL connection so some people get it anyway on their uploads too. If you had a 1Mbps ADSL then you wouldn't get 1 Mbps on upload, just on download .
MTNL says it's ADSL but actually it's SDSL...just check ur sync rate and u'll know...the download gets synced at 288 kbps (which should be 256 kbps, but i think they just want their users to have the best) and the upload gets synced at 256 kbps... as much i know, Airtel is ADSL...and srrao has already clarified that
It can't be SDSL coz in actual fact, upload speeds on MTNL have never crossed the 128-150kbps mark for me. Might be different for u. Btw, just wanted a clarification. Does a 256k connection mean we can download at 256 and upload at the same speed(in ideal conditions) simultaneously? Or is it that the total bandwith is 256 both ways..