TalkTalk's new DLM is on their ADSL only.
I have an ADSL line with them and it's been pretty stable for years, they were able to set a 6db margin, fastpath, and disable the DLM on it..... until the new DLM was put in place.
Now I have gone from 15ms ping to 38ms, reduced sync, etc. etc. honestly the DLM has really screwed me over.
The only reason I kept with talktalk was due to the fact that I could get DLM disabled - now they are unable to do that I will be moving this line as soon as my contract is up.
The other odd thing is that since they put this new DLM in place I am unable to upgrade to fttc with talktalk, even though it's available with every other ISP (and my main line is infact FTTC already).