with 40+ days internet connection time I would have expected a drop in noise margin and a small increase in speed I am loathe to suggest a router reset to see if that will trigger speed improvement with that stable connection bearing in mind you may only get another 2/3mb in connection speed. You would not notice such a small increase apart from watching the stats
Command once logged in via telnet was
wan show connection info
From there I found the ADSL connection info.
Hope this helps.