Yes DSL Mode is set to auto..G.991.1 and G.991.2 are ADSL, .3 and .4 are ADSL, .5 is ADSL2+
Connection SpeedYour connection speed can give clues too. The upload speed on ADSL tends to be lower than ADSL2+ even on longer lines. From memory (and this might be wrong you are looking at 448 upload on ADSL and higher on. ADSL2+.
Netgear DG834GWhich Netgear router is it?
Other than upload sync you could Telnet into the router or download Routerstats (great little program).