In reply to a post by EloiseJane:

Really appreciate you looking at that RobertoS.

For a while both up and down SN margins were around 6 after the changeover to DLM.

That's DLM doing its job . It started with a fairly safe 6dB that is almost always high enough to stop frequent disconnections. After a while it decided your line was having low volumes of errors and decided it could lower it - giving you more speed. Absolutely nothing to worry about - that's what it's supposed to do.

If your line had been getting a very high number of errors it would have raised it to 9dB, slowing you down.

Have a read of this page. Now a bit out of date and only talks about BT Wholesale DLM, (that's what most people are on who aren't on Sky or TalkTalk), but the basic logic is the same.

I'll try a reboot again tomorrow.

I wouldn't bother. It looks to be fine. You were worried because of what you read about 6dB. It used to be the BT Wholesale default and they would only ever go higher. Now they allow 3dB.

Over the years I've seen lots of ill-informed posts saying your line had to stay at 6dB or else disaster. You have probably seen some of those.

Once you've read the linked page you'll see why that is rubbish. It's a margin! As long as the drop caused by random noise is less than the margin then there isn't a problem. You still have a margin. Mine used to drop by 3.5dB every night and recover to 6dB in the morning. So I needed 6dB setting otherwise I would have had an overnight reconnection at a lower speed. (DLMs don't normally re-sync once the margin has risen).

If you see the margin shooting up and down by several dB many times a day, than that suggests either a line problem or somebody with a very electromagnetically noisy piece of equipment close to your line somewhere between you and the exchange.

Edited by RobertoS (Fri 25-Nov-16 01:06:51)

RobertoS,

Thank you for all the useful information.

There's a problem my end with that link - 404 Not Found?

Will be back here soon, have a busy day tomorrow.

Yes, currently using a HG533 router 'vitrocmax'.

So glad I found this site.....

Oops! Sorry .

I always check links work, in the Preview screen, except - once in every 2,816 posts I forget. Then there's always something wrong with it. In this case the link double-pasted into the link format.

Fixed and tested now.

TalkTalk may not have a DLM like the dynamic BT Wholesale ones, but they do have different line profiles available but are usually manually controlled, i.e. no licence cost for DLM system

The seeking to a target noise margin is of course the usual xDSL behaviour.

I have a fixed 6dB S.N.R.M. it def. helps my >6km E.O.line to cope......just!!

With TalkTalk.

Agreed that's what they had Andrew, but this sounds like they are moving to a true dynamic one. That's what the OP appears to have been moved to, and see this key post. Unfortunately it doesn't have a link.

Edited by RobertoS (Fri 25-Nov-16 11:11:20)

In reply to a post by vitrocmax:

There's a notice on the TT Community page that says they are moving over to DLM but it doesn't give a timescale.

Any chance of a link please? I've been posting relying on this since you posted it, but being able to read the original is always a help .

Thanks for the new link RobertoS....

Will check that out this weekend.

Well I wanted sound independent advice and I certainly got that here.

Just received an email from the TalkTalk CEO handling my case.....

"Our technical department have looked at your connection again and have said they checked the line stats via their new Dynamic Line Management system and it has dropped the SNR margin down to 3dB as the line was deemed stable enough to handle it. The only recent drops that they can see are in the early hours of the morning and this is when the system has been amending the profile. It is showing stable any other time.

The technicians have said that if a line has an SNR margin of 3dB the system will set that level if the line can handle it which this one can and it is normal for it to fluctuate around 1dB either way across the day and that is why you would have seen it move from 2 and 3.9dB.

The reason it was previously set to 10dB was because our technicians could set it themselves but the new system constantly monitors the line and if it becomes unstable the SNR margin will automatically amend to a more appropriate level."

So seems DLM did make that final tweak 'Zarjaz' spoke of earlier.....

But why only on the down and not up, which is still at 6dB it seems?

I'm wondering.......is this TalkTalk's own DLM or BT's? I'll ask.

It is TalkTalk's own (or purchased from elsewhere as has been suggested). Almost certainly not a copy of BT Wholesale's.

The upstream I don't think I have ever seen changed. It basically isn't necessary to do so. It can be affected quite badly by a line fault, but then the downstream is shot to pieces anyway and the fault gets dealt with.

Edited by RobertoS (Fri 25-Nov-16 13:52:18)

I see.......thanks for the info.

I've yet to answer their email, will do so at the weekend and try to find out more.