You can get a bit more than the basic info, but it's a bit of a faff...
Log in to the router and go to "Troubleshooting", choose "Event Log", and Category "WAN". You'll find something like this from the last time your line synched:
22:04:23, 09 Aug. ( 105.560000) DSL is up
22:04:22, 09 Aug. ( 104.640000) DSL noise margin: 5.90 dB upstream, 6.00 dB downstream
22:04:21, 09 Aug. ( 103.730000) DSL line rate: 1151 Kbps upstream, 14616 Kbps downstream
From September 2001 on BTopenworld Home 500/Home 1000/Home 2000. Then ADSLMax on <n>ildram. Moved to ADSL2+ from ADSL24. I'm now with plusnet. I'm not saying who I work for. Any opinions expressed here are my own.