Today I powercycled my ADSL-modem. On AdslCentrale.nl I saw that it was sometimes required to restart the modem to recieve the new speed. Weeks ago I already noticed that the Line-Sync speed had gone up, but until my powerrecycle I did not get my upgrade. Now my ADSL-connection should be at 1500/256 kbit/s which helps while downloading Debian upgrades.