What's happened to my Annex M?

[#1]

Hi,
I'm away from home at the moment but just trying to see if I've missed something...
I raised a question #48725002 because my uplink sync dropped at the beginning of October.  I thought it would recover but it hasn't.  When I checked in more detail, I saw that my DG834G reported just ADSL2+ and not ADSL2+ Annex M.
The response to the question was that my profile is still ADSL2+ Annex M and that I should raise it as a fault.
I set the DG834 to Annex M only and it wouldn't create a link but OK if I re-enabled ADSL2+.
Is there something I have missed?
I'm just concerned about going through the whole fault reporting process in case I have missed something obvious...
Dusty

 Date            Day Down      Up
13/11/11 18:01  Sun 5544 Kbps 790 Kbps   
04/11/11 16:26  Fri 4592 Kbps 810 Kbps  
01/10/11 13:13  Sat 4580 Kbps 740 Kbps
25/09/11 19:10  Sun 4134 Kbps 1080 Kbps  
30/08/11 19:50  Tue 4130 Kbps 1047 Kbps  
25/07/11 21:12  Mon 4135 Kbps 1058 Kbps
09/07/11 22:42  Sat 3675 Kbps 1054 Kbps
04/06/11 22:15  Sat 3810 Kbps 1043 Kbps
10/03/11 22:26  Thu 2674 Kbps 1080 Kbps 
28/02/11 22:00  Mon 2674 Kbps 1080 Kbps

[#2]

Hi dusty_bin,
I've just run some diagnostic checks and you're definitely configured on Annex M. What speeds would you have normally seen? If they are considerably lower then I certainly would raise a fault.
Jojo

[#3]

I'm rather disappointed with CSC - or is it my fault for giving too much information?
As suggested above, I raised a fault on ticket 49296820
DSL Logged Faults asked me to complete the TAP3 test and, when run, showed low upstream throughput.
I reported that back and included additional information about the disappearance of Annex M on Tue, 2011-09-27 23:24:25 UTC, and also information from Dave Tomlinson last year that BT said my line attenuation was high for the distance I am from the exchange.
Until 2011-09-27 router reported: Mode: ADSL2+ AnnexM EU-56
After 2011-09-27 router reported: Mode: ADSL2+
My conclusion was it looks like there are really two issues:
- the fact that I can't sync with Annex M - probably an exchange equipment configuration issue and;
- the low throughput compared to the sync rate - that is probably a line issue.
Today I got a response from CSC:
Annex M works in a way that it will split the bandwidth to this percentage and would be the reason that you you are obtaining 4541 Kbps downstream. The fact that you can not sync with Annex M is because the bandwidth of the line is not high enough to sync.
From checking your TAP 3 as well as the profiles it is suggesting that this is correct for your line and that there are no faults on the system.
This is rather odd because in the previous ticket 48725002 CSC said:
"Once you have raised the ticket please provide all further information onto your newly raised fault ticket as we can not provide you any further support. We are not trained at a standard of our Faults team but our faults team will be able to answer any questions you have.
I've asked them to put this ticket back to the fault team, but why didn't it go straight back to them if I was answering their request?

[#4]

Hi dusty_bin,
The ticket is now with the faults team, I'll see if I can get someone to take a look.
Jojo