Yes, the line has been rock solid ever since we last spoke about it.
So a target noise margin of 3 is OK? ..it's something I don't know much about
It's at 2.8 right now ...no, 2.6 a couple of minutes later.

OK, tomorrow I'll copy the stats and unplug it for a few minutes, then see the stats again. Of course the power cut was in total darkness outside! (aren't they always!)
I hope your forecast is right!

Yes - total darkness ..power cut 9.45-10.15pm

I'll be doing as Bob says around 11am tomorrow (when I get my brain in gear - I'll work until around 2am)
SNR was 6.4 and 3.8 on 19th - been around that for around a week or so.

thanks

I just checked my customer info and see that the TR101 info would appear updated on there around an hour after the router was connected again (if it's not a 24hr clock) after the power cut - but it hasn't changed & doesn't seem to reflect the router stats or the BT test done earlier:

Line rate data
Upstream
Downstream
Sync Rate
BRAS Profile
Interleave
Sync Date

1087 6965 7895 TR101 Auto 23-Jan-2012 11:17
1087 6965 7895 TR101 Auto 19-Jan-2012 09:30
416 4573 5184 TR101 Auto 12-Dec-2011 05:29
I also see that the Synchronisation Data changed on 21st, but have not been aware of any changes in connection that I've noticed:

Synchronisation data

MSR
6816
FTR
5452
MSR Reset Status
N
Date
21-Jan-2012 02:33

Anyway, will note the router stats and then do the disconnect/reconnect tomorrow and post the results.

....did the disconnect/reconnect:

Router Stats:
DMT Status No Defect
Operational Mode ADSL2+
Upstream 1083
Downstream 7867
SNR Margin(Upstream) 6.1
SNR Margin(Downstream) 6.0
Line Attenuation(Upstream) 22.7
Line Attenuation(Downstream) 45.5


BT Test:

1. Best Effort Test: -provides background information.

Download Speed
6389 Kbps

0 Kbps 7150 Kbps
Max Achievable Speed

Download speed achieved during the test was - 6389 Kbps
For your connection, the acceptable range of speeds is 2000-7150 Kbps.
Additional Information:
Your DSL Connection Rate :7867 Kbps(DOWN-STREAM), 1083 Kbps(UP-STREAM)
IP Profile for your line is - 6940 Kbps

2. Upstream Test: -provides background information.

Upload Speed
807 Kbps

0 Kbps 1083 Kbps
Max Achievable Speed

>Upload speed achieved during the test was - 807 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1083 Kbps


So, I seem to have gone back to 6.7 (Speedtest) whereas I had 7.4 after the power cut & this morning, and an IP profile of 7633

Yep. That's odd.

The noise margin is back at 6dB, hence the same speed as before, but I can't think of how on earth you got the higher sync after the power cut. That had to be from a 3dB setting.

I saw in the Zen section of TBB that someone who changed to ADSL2+ had no down speed improvement and found this:

"I got onto customer support this morning and after a bit of investigation was told that although I had been upgraded, BT's profile still had me on 8Mbit"

Is it possible this is the case with my connection do you think?

This is the SNR right now:
SNR Margin(Upstream) 5.7
SNR Margin(Downstream) 6.0

No. You are on true ADSL2+. On 8Mbps with Zen the highest connection speed is 8192kbps, "Your DSL Connection Rate :8652 Kbps" would be impossible.

Lots more evidence earlier as well, most obvious being the attenuation changes and the fact that in at least one post it says so.

The MSR info in your 1:58 post also indicates a 10-day "training" started on the 11th, which is when you were upgraded to ADSL2+.

I think in another 10-14 days you may find the noise margin is reset to 3dB. Can't be sure though.

Which reminds me, you didn't take the stats before the disconnect just now, which I asked for . It is highly possible your speed had already dropped. The time for the target noise margin to rise due to something going wrong is "up to" 75 minutes, and causes a reconnection with that setting.

We are never going to know, unless something shows in the latest TR101 data.

Sorry Bob -
I did make a note of the stats at 10.49am this morning - nothing had changed except the SNR which was 3.8 down 5.7 up, and again at 12.45pm just before I disconnected, it was 3.4 & 5.6.

Any good disconnecting for longer than a minute or two and trying again?

In reply to a post by TrishaH:

Sorry Bob -
I did make a note of the stats at 10.49am this morning - nothing had changed except the SNR which was 3.8 down 5.7 up, and again at 12.45pm just before I disconnected, it was 3.4 & 5.6.

Any good disconnecting for longer than a minute or two and trying again?

Fine, as long as you checked the sync, which I'm sure you did.

Another disconenction isn't likely to change anything, but who knows? Just don't do several. Whether it does or doesn't, I suggest after that you leave it alone for a fortnight and see if it drops the SNR back to 3dB.

Yes, this morning everything in the router stats was exactly as last night except the SNR.

Had no choice re a resync this afternoon - alarm had a problem after the power cut and needed the power off for 20 minutes while son checked the back-up battery!

So, when it was back on, these are the stats:

Router:

DMT Status No Defect
Operational Mode ADSL2+
Upstream 1095
Downstream 7799
SNR Margin(Upstream) 5.8
SNR Margin(Downstream) 5.8
Line Attenuation(Upstream) 22.7
Line Attenuation(Downstream) 46.0


BT Test:
1. Best Effort Test: -provides background information.

Download Speed
6347 Kbps

0 Kbps 7150 Kbps
Max Achievable Speed

Download speedachieved during the test was - 6347 Kbps
For your connection, the acceptable range of speeds is 2000-7150 Kbps.
Additional Information:
Your DSL Connection Rate :7799 Kbps(DOWN-STREAM), 1095 Kbps(UP-STREAM)
IP Profile for your line is - 6880 Kbps

2. Upstream Test: -provides background information.

Upload Speed
824 Kbps

0 Kbps 1095 Kbps
Max Achievable Speed

>Upload speed achieved during the test was - 824 Kbps
Additional Information:
Upstream Rate IP profile on your line is - 1095 Kbps

Shame because before the power cut, the throughput was 6965/1087.
Still, Speedtest not much lower:
1/24/2012 4:33 PM GMT
6.67 Mb/s
0.93 Mb/s
25 ms

I'll do as you say & leave it alone now and see how it goes.