As I already wrote, theoretically ADSL RAM is available at my place. The analysis of the situation revealed first that the ISP side of my line uses outdated hardware. After the technician I know unofficially took care about it (remotely switching me to a different port), I have seen an immediate improvement of the signal to noise ratio. It is about 20 dB better.
Unfortunately this was not enough to be able to switch to the rate adaptive mode. According to their database the line length allows to give me 1.5 MBit. My line is running already at 2 MBit and my ADSL modem tells me it could do 8 MBit, so I disagree a bit with their database.
As the technician agrees with me, the next step would be to temporary move my house by some hundred meters towards the ISP endpoint of the line, unfortunately the higher management seems to be having some business ideas with our region (FTTT, Fiber To The Town (which means we will probably get 16 MBit via ADSL) … but maybe even FTTH), so they are now monitoring the database for such changes since a while.
I have the impression they seem to prevent such changes to the database because they think that if people get 2 MBit (instead of nothing, large parts of a town nearby does not even have the slowest ADSL connection) or 8 MBit (instead of 2 MBit), they are not interested in getting FTTH (or 16 MBit). Together with their IPTV initiative I do not really understand it. To get their IPTV, you need to have at least a 8 MBit line. With 8 MBit you can only cover one TV at SD resolution (at least with their IPTV offer), if you want HD resolution, you need to switch to their VDSL stuff (which is not available in our town). What people are doing currently is to switch to a cable provider where they can get about 32 MBit (I do not switch, switching is a risky action here, I rather stay with a slow connection that to have no connection at all for some months). With 32 MBit (and TV) people have less a need to switch to fiber (and pay 150 EUR for the work to get fiber into the house) than with 2 MBit or nothing.
The final outcome is, that the technician I know does not want to ask someone to play with the database to move my house temporary (which I can understand). The good part of those news is, that I may get more than 8 MBit in the not so distant future (the current planning is to finish the FTTT work until autumn).