In reply to a post by lee111s:

That's not my experience of it.

The lower target margins are simply an additional tool to DLM's belt in the battle between speed and stability.

3db is not the default target.

Maybe that part hasn't rolled out to your area yet, but as far as I know the rollout should be complete by the end of August, so you should see changes by then

https://www.thinkbroadband.com/news/7668-openreach-a...

I know this refers to the original trial ... but nothing has changed.

Changes will only be seen if DLM thinks a line can handle a reduction in target margin. That doesn't mean the default is changing from 6db

You don't seem to get that.

I've said my bit. Adios.

In reply to a post by lee111s:

Changes will only be seen if DLM thinks a line can handle a reduction in target margin. That doesn't mean the default is changing from 6db

You don't seem to get that.

I've said my bit. Adios.

Nice to see that you didn't read the link that Zarjaz posted about the trial. It states that during the trial: The trial involved the Openreach DLM system identifying lines that were stable at a 6dB target noise margin, and then lowering the target noise margin in 1dB steps over an extended period and monitoring the error rates and connection speeds.

Note the words "lowering the target noise margin"

This applies to existing connections with the full rollout and new connections will be placed on 3db to start and raised if the DLM sees that it's not stable.

As yet I've not seen any of the broadband forums post any of the details of the rollout and it's changes from the trial, but I have seen a couple of people post of the BT forum in particular about it now working on eci cabinets like the ones in my area. This does prove that changes have been made since the trial and maybe not everyone is aware of them yet.

The target noise margin and the default target noise margin are two seperate things. No one has denied that lower target margins can be and indeed are being implemented by DLM.

I read the article when it was published, and did again when Z posted the link.

Nowhere does it state the default is 3db for new connections. You're adding 2 and 2 together and coming out with 3

In reply to a post by lee111s:

The target noise margin and the default target noise margin are two seperate things. No one has denied that lower target margins can be and indeed are being implemented by DLM.

I read the article when it was published, and did again when Z posted the link.

Nowhere does it state the default is 3db for new connections. You're adding 2 and 2 together and coming out with 3

As stated in my post, that link refers "ONLY" to the trial and not to the rollout. As I'm sure you are aware changes do happen from a trial to full rollout and I'm only going by what I've seen in the field (with the full rollout) and what I've been told is happening

As nothing has been published, we can only assume (and go from engineers who work on the products ona daily basis) that nothing has changed.

In reply to a post by lee111s:

As nothing has been published, we can only assume (and go from engineers who work on the products ona daily basis) that nothing has changed.

A good lesson for if you're ever in a business meeting. Don't assume anything, always go in with either facts or observations, otherwise you won't be taken seriously and you will end up looking stupid (or even fired)

Why did you not paste that complete paragraph from SIN 498. You conveniently picked the part that suits you.

" the actual value shall be determined by the Dynamic Line Management (DLM) algorithm based on line stability. "

The default is still 6dB. It will remain 6dB.
ECI cabinets are not part of the current lower dB rollout until retransmission is fixed.
Even in areas where this has been rolled out to the Huawei estate, the majority of lines remain on 6dB.
New lines stay on 6dB, and reset lines return to 6dB.

We have dozens of lines uploading stats every minute to here:
https://www.mydslwebstats.co.uk/Container.htm
Find me a single line that started on 3dB, because I can name you 10 that started at 6dB, and have since dropped to 5, 4, then 3, and a few that have stayed at 5, or 4.
The majority remain on 6dB.

Nuff said.

Edited by j0hn83 (Mon 10-Jul-17 13:58:47)

sorry jOhn83 but your information regarding ECI cabinets is incorrect.

I post an image of a screenshot of a connection on a ECI cabinet clearly showing a 3dB

https://postimg.org/image/o68zsvzpj/

Too many people are assuming things