We've discussed about this in the past and I agree with you that 20 doesnt always seem to fit with what we are seeing. Each subsequent release of any MTBR figures always seems to be higher than what can sometimes happen in reality
I think I've also mentioned to you before about the little known or talked about
'Scarlet ILQ'. I cant find much info about this other than what is on the
Plusnet site where there is a very hard to see graphic
Note on there the mention of 10. OK things may have changed but what I have found in BT documentation is classification of a 'Very Poor' status (separate from MBTR red) whereby DLM will react quicker if several retrains are detected in a short period. I dont know what is classified as short period, but it leads me to believe that obviously its not over the usual MTBR daily period.
Perhaps it could be something like 10 in an hour (or 2 hours?) for speed, and if they do half things like they usually do for standard then that would equal the 5 you mention you are seeing. Can't find anything about this now and everything is locked down tight since ASSIA case
Ive been asked a couple of times in the past week or so if I'd release what info I had got and although Ive always made the page available to members from here, Ive just never linked to it on the main site, because it was specifically the ILQ scarlet and steps to remove DLM where things had come to a halt and these I wasnt sure about.
I think the best thing to do is gloss over those 2 areas, because nothing new has come to light during the past 10 months and it seems stupid holding back on other info such as wide area events etc which I am certain about.