The only ISP that might do this could be Andrews & Arnold, should Openreach ever (doubtful) open up a bit more to ISP's in regards to DLM on FTTC.
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@kitz: In regards to ASSIA and Openreach changes, for certain they changed the banding. For example, the minimum sync rate used to be half of the maximum sync rate (e.g. minimum 40Mbps, maximum 80Mbps) unless currently on an open wide profile. Now all banding has a minimum sync rate of 128Kbps. Beyond that I don't know if any other changes were made, certainly not that I could notice from the console on the DSL-AC68U.
The stuff I saw wasn't from AAISP, but they are perhaps the only ones that I could think of who would perhaps even think to integrate this into the customer portal.
As Chrys pointed out, they do give ISP's a lot of info that isn't relayed back to the EU's. ISP's were given a lot of info about DLM by BTw. However its not in one 'book', but takes a lot of piecing together from various documents. It took me a loooooong time to even attempt to put things into words that the layman would understand. Before I did that I had to try and put something together which explained the hardware side first so that people would know what the various bits did. No-one really wants to spend time and effort trying to collect it all together to explain to EU's when most of them either dont care, or wouldnt have a clue what you are talking about.
There is only Chris Pettit from Plusnet that did so - I believe quite a lot of it in his own time. Then some of it changed soon after. There was another rep from Zen who was also piecing things together but for some reason he abandoned it before it was complete. The beta tool for line info again was coded by an ISP rep in his own time.
ISP's get told each time DLM params such as MTBE & MTBR get changed, but the SP's don't seem to do much with this info and I doubt the info is ever retained for long because its passed to them in snippets amongst other info.
Re capping - we know for certain that BT had to change something on the NGA DLM after the ASSIA court case. The 20CN/21CN appeared to be deemed OK and afaik no changes were ever made to those. The only big difference with the NGA DLM is that they used speed caps rather than target SNRM. Much of the other stuff is the same and of course G.INP is new since then, but even with G.INP the ISPs were told info that never really got much further into the public. Plusnet was telling snippets and Ian Lawrence (OR chief engineer) either confirmed or told some new facts to us. I admit he didn't answer all questions, but I am mindful that this was relatively soon after ASSIA.. there is no doubt that since then they have been a bit more reserved about what they say about DLM. The other thing where we have some missing info on is how long it takes to reverse any DLM changes.
However ISPs do know MTBE/MBTR figures - supposedly to help them chose which profile they want to put their customers on. They do get info like what BS has just shown us, only they only retain the last set. They could easily retain more if they wanted. They even have access to such things as how many errors the line has. It's down to the the GUI interface thing again and up to the ISP to build something if they want to make use of the raw data. Obviously someone at Openreach has coded something for their engineers, but even so the ISPs do still get quite a lot of data by the BTw & Openreach test suites that they can perform.