I am told by an even more reliable source that the new DLM also has a much less aggresive noise margin policy. I wasn't given any details though.
As long as there are no great bugs, it greatly decreases the arguments against BT Wholesale connections. I have always been vociferous in condemning the "old" DLM.
More good news WRT DLM then - you are not alone in hating the old version - I ended up with a target of 9db for ages after once letting my modem hang on to a higher than normal sync that got me +500kbit. I guess DLM saw that my margin was mostly 0-3 and maybe too many errors and bumped up the target - which lost me a meg.
It was only recently that it went back down to 6 - a couple of weeks before switching to 21cn.
I also haven't been on fast path for years - until yesterday. I am now hoping DLM doesn't switch me back with more interleaving than I already had, or raise my margin from 6.
Given the amount of FECs I got I am surprised it changed me.
It has inspired me to get gnuplot and finally get round to making a graph from my logs - so here's just before the switch to fast, and after till now. Having to use log 2 scales to make things fit is not ideal.
Time will tell what happens - noise is much the same before and after - usually 6 but fluctuating a bit sometimes.