In reply to a post by Oldjim:

The 20CN is still working as it always has - Plusnet updating within 12 hours of the BT profile changing

It has always had this occasional failure.

and my experience and that of many others is the new system didn't work as advertised

Now that's a confusing post . What are you talking about? The BT IP Profiling system or the communication of its changes to Plusnet's copy system?

The BT IP Profiling post-August 2008 works fine. The issue being discussed here is the failure of the BT system communicating the profile changes to PN, wherever the fault for that lies.

The 3-day system stopped in August 2008, Fact! Two of you this evening have posted as though it was still in existence and as I'm sure you agree the perpetuation of incorrect "facts", i.e. internet myths, is to be deplored. It certainly doesn't help the discussion in this thread, either for those participating or any later readers.

I can personally vouch for the system that was introduced at that time working as advertised. I was with Newnet, with a slightly unstable line, and when I had a small drop in sync, losing me one or two profile steps, it would take 4-5 days instead of the previous three for the IP Profile to rise again. However it was easy to fool the system.

Just before going to bed, a few of us when in this position would tweak our noise margin extremely high for a few minutes to force a very low sync/profile. Then tweak the margin to something like 3dB, (bearing in mind that's where it would have been at that time of night for many of us). That gave the sync expected from a standard daytime 6dB margin sync, and bingo - come the morning the profile was up to the right place.

The key is to have a high percentage increase in sync. A doubling of sync didn't rate as high . IIRC that gave around the old three days. The further above 100% increase the more rapid the adjustment.
_{Edit - typo as pointed out by ian72}

Edited by RobertoS (Tue 11-Sep-12 09:33:22)

The 3-day system stopped in August 2000, Fact!

Are you sure - this is before they even introduced variable speed products. Think that is a little mistype

In reply to a post by RobertoS:

The BT IP Profiling post-August 2008 works fine.

In my experience and that of quite a few others it didn't

In reply to a post by Oldjim:

In reply to a post by RobertoS:

The BT IP Profiling post-August 2008 works fine.

In my experience and that of quite a few others it didn't

I repeat! Do you mean the BT/Plusnet copying system? That is nothing whatsoever to do with the underlying profile set and applied by the 20CN DLM.

I think I'm right in saying it even cured the historic 2000kbps stuck profile problem.

If my room does not become light when the sun is due to rise, it doesn't mean the sun hasn't risen. It is because the blind-opening mechanism has failed.

It's my impression that that works absolutely fine. Where the sync speed doesn't rise it's because of other factors like another low sync event or the user getting impatient and rebooting the router to try and increase the speed.

Confusing the issue is that most frequently posters give the result of a speed test which doesn't increase because of the delay/non-update of the PN profile instead of checking the IP profile reported by a speed test.

Also complicating this is the DLM which does take a long time to lower the target noise margin, but that is a different issue to the IP Profile updating to reflect the current sync speed.

The final complication is that half the time the BT speed test wouldn't run so users couldn't find out what their IP Profile was anyway - although that seems a bit better these days.

To clarify - al;though I thought I was being very clear
The BT system - also called adaptive max logic - in my experience didn't work as advertised.
I see no point in continuing this discussion as obviously my memory/experience must be faulty

I haven't seen an example of this reported on the Community forums for a user on 20CN for a very long time.

As an example of how this is working on FTTC, my modem resynced slightly higher, from 71491 to 72203 on Sunday, so I rebooted the router to increase my IP profile from 69.2 to 69.89. 24 hours later the Plusnet profile still said 69.2 but it has updated to 69.8 this morning. So it seems to work but it's a bit sluggish.

http://speedtest.net/result/2186494347.png

Edited by kasg (Tue 18-Sep-12 09:20:16)