I just want to quote one of your old posts here:
http://forums.thinkbroadband.com/fibre/t/4534104-re-...

Physical Link Status
DSL Status
Up
DSL Enabled
DSL Uptime
6 minutes 5 seconds
DSL Type
VDSL2
DSL Mode
Fast
Line Rate
10.67 Mbps 50.5 Mbps
Data Transferred
118.85 MBytes 694.14 MBytes
Output Power
12.7 dBm 7.5 dBm
Line Attenuation
0 dB 0 dB
Noise Margin
6.3 dB 6.2 dB

Notice how before all the work your line had a noise margin of 6db, but a sync of 50Meg. Your line back then was only capable of 50Mbps... So whatever work has been performed has released more speed, hence your NM is now 11.5db, but unfortunately your line had likely already been banded at 49Mbps during all these faults etc.

Thank you, however this doesn�t seem very intuitive. 3dB is better than 6dB so why should 11.5dB be good ?

Ukhardy07

I very much appreciate you taking time to help and also for constructing an email for me - I�ve been using 4 Gigaset Dect phones the master being the only one in a phone socket(master - but now the Test socket) the 3 slaves using wireless to communicate. I have swapped this out for now and now just have an old Panasonic (digital) handset in the test socket. However as you stated earlier as I�m banded, I won�t see any measurable speed increase unless the cap is removed.

We�ll see if the email works but even if not, I�d just like to convey my appreciation to everyone here who took time to help Thank You.
Jamie

Do you think it would be worth mentioning that BTW Speedtester can get as low as 43Mbps? There should be a database record even for 38 from today.

I wouldn�t be averse to disconnecting the internal wiring TBH and any link as to what to do would be appreciated though I�ll leave the faceplate off until I have some kind of reply from BT but I know my wife will only put up with the dangly filter for so long

A 1dB change is more likely to be because there is no load caused by extensions and is very small. It pushes your max achievable up slightly but you are still banded at 49 - that is why you have a 10 or 11dB margin.

Thanks for the explanation

Say I have 10meg banded sync.

At 3db noise margin the line can�t really support much more speed. So 10 meg is the best.
At 6db noise margin, if the lines stable enough, we could lower the noise margin to 3db and get more speed.
10db noise margin at 10meg indicates we could get a lot more speed out of the line by lowering the noise margin to 3db.
11.5db indicates we could get even more speed.

A higher noise margin is almost like a buffer, a higher noise margin indicates your line can tolerate more interference without dropping. Conversely, as the noise margin goes lower the line can tolerate less interference.

This is why when they cap your speed, your noise margin goes up. It means your line can take much more noise or interference without drop outs.

So unstable lines get a higher noise margin, indicating a cap is in place, the line could support much faster speeds but for whatever reason the lines been unstable and has been capped. In your case this is likely due to the extensions initially or some external interference beyond your control.

All we can do is request a reset, hope it�s approved, if the line goes back to a 11.5db noise margin we know the interference is external and nothing anyone can do.

For reference most lines get a 6db noise margin, only crazy stable ones get 3db.

Edited by ukhardy07 (Sat 20-Jan-18 17:01:59)

Let us know how you get on with BT

Sorry it took so long to report back

No joy, in fact a rather adversarial chap tells me all is in order, in spec and as promised.

Letter

I never actually stated I wanted to leave BT hoever during a conversation I quoted their agent when I called the retention number when BT asked in Nov/Dev if I would leave or stay..
"Reshma: You will get a different device booster at the end of the December month where it will increase the speed upto 76mbps. So that the Internet connection will be more speed and stable also."...

I have drafted a reply but probably won't send it as I don't think it would solve anything coming over all snidy etc.

but anyway it goes a bit like this...

"Thank you for your letter of the 28th January 2018.

I have no idea why you should raise the subject of contract release and my moving elsewhere.

Why on earth would I do that?
It wouldn�t solve the problem which I have would it. Oh sorry you don�t accept I have a problem.

I note you didn�t mention the very poor BTW Speedtester results I sent you. By very poor I mean between 30-40Mbps a few have been a bit higher than that.

I�m not going anywhere and since you mentioned 44Mbps to 55Mbps I shall continue to send you or your successor BTW speedtest
Results in the 30�sMbps unless you can properly justify why they are so poor unless of course it isn�t an accurate product and thus to be ignored.

Note: I comply with all the rules of this test and will endeavour to test at various times of day and night to ensure a fair balance of possible contention. "

Ah well it helps to type it, but I can't understand why BTW Speedtest is consistently low - and oh I learnt that only the last test done stays on the database.

They will only look at the sync, nothing else as this is a sync issue as far as I can see.

I would just push-back along the lines of:

"I am not interested in the sales call at recontacting, that is irrespective here and I dispute the claims regardless.

The noise margin is now sitting at 10db, which is elevated above the 3db and 6db noise margin I had prior to the faults. The max attainable reported by the router is over 65Mbps which is in line with my speeds prior to the faults openreach attended for.

The BT engineer informed me another engineer may be required to reset the Dynamic Line Management post fault if the speeds did not improve. This clearly needs to be done. Are you able to kindly escalate and get this done as agreed prior? "

Edited by ukhardy07 (Wed 31-Jan-18 17:36:50)