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    Openreach appears to be taking lower noise margin trail national

    This is a discussion on Openreach appears to be taking lower noise margin trail national within the General Computing and Internet forums, part of the Community channel category; thinkbroadband :: Openreach appears to be taking lower noise margin trail national A trial has been running looking into whether ...

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      Scubbie's Avatar
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      Openreach appears to be taking lower noise margin trail national

      thinkbroadband :: Openreach appears to be taking lower noise margin trail national
      A trial has been running looking into whether Openreach can squeeze more speed out of VDSL2 for some lines with no hardware changes in the cabinet or by the customers VDSL2 modem and it seems on Monday 20th March, this limited area trial is set to go national.

      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. The monitoring is not new, the Openreach DLM (Dynamic Line Management) is constantly running, the change is that while 6dB is currently the lowest target noise margin modems are told to negotiate the connection at and now for lines that look like they can cope with lower margins without undue numbers of errors lower margins will be allowed. The bonus is thus more download speed without any cost.

      It is thought the trial involved some 40,000 lines and we presume Openreach has seen positive results from the trial, we are monitoring what we believe is the trail area but to date have not seen an observable difference, but this may be that the 40,000 lines is swamped by those not in the trial but still in the area we've been monitoring. It may be once we run the Q1/2017 analysis in a couple of weeks we can see some indication of a difference, or it may take many more months once things go national.

      The way the target noise margin's work mean that if your line is stable, then it does not matter if you connect at 21,232 Kbps or 44,536 Kbps its all about if the DLM thinks the line is stable and suitable for trying a lower margin, what will differ is the amount of benefit different people see and many people may see no change at all. Its important to emphasis that the drop is in 1dB steps down to a minimum of 3dB, and the margin may return back to the 6dB level if things do not look stable.

      Sweating the assets to squeeze what might be just be a 2 Mbps average increase seems like a lot of work for little extra speed, but for individuals it might be worth much more speed, and given that across the UK if most users getting 24 Mbps were to see speeds jump to 30 Mbps this could mean that models on performance versus distance would have to change and a 6 Mbps jump for lines in the 1km long region would be worth 0.6 percentage points to the UK superfast total. CAUTION Don't take the 0.6 change as been what we expect from the roll-out, it is just an illustrative figure and we will only change our model if we see a significant change, in the past monitoring experience against our model was more difficult but since Autumn 2016 we have automated this so we can keep a better eye on how all the various changes are affecting the model we use.


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      Re: Openreach appears to be taking lower noise margin trail national

      But don't get excited if you are on an ECI cab, as it will not apply to you... at least not for a time as yet unknown!
      --------------------------------------------------------
      Artificial Intelligence is no match for Natural Stupidity.
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      Re: Openreach appears to be taking lower noise margin trail national

      What's an ECI cabinet?

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      Re: Openreach appears to be taking lower noise margin trail national

      Vdsl street cabs are either huawei or ECI. See google images for pics. Eci are smaller than huawei. Sadly yet again those of us on eci cabs still have no G.INP or the new lower snr profiles. Postcode lottery for vdsl. Totally unfair. We pay the same but a bunch of us do not enjoy the benefits that come with being on a huawei cab.

      Openreach need to fix this so its a level playing field.


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      Re: Openreach appears to be taking lower noise margin trail national

      On the other hand Openreach could put up the prices for those on Huawei... No wait, I'm on Huawei, I'm giving them bad ideas!
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      Re: Openreach appears to be taking lower noise margin trail national

      ECI users should get a discount if they are unable to resolve G.INP and the lower snr profiles wah lol..
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      Re: Openreach appears to be taking lower noise margin trail national

      Openreach appears to be taking lower noise margin trail national-my-fibre-cabinet.jpg


      My little cabinet is the one on the right.

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      Re: Openreach appears to be taking lower noise margin trail national

      Welcome to the ECI club....... no G.INP or lower profiles for you at the moment..
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      Re: Openreach appears to be taking lower noise margin trail national

      I dont want g.inp thankz
      Last edited by Shonk; 18-03-17 at 06:52 PM.

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      Re: Openreach appears to be taking lower noise margin trail national

      Quote Originally Posted by Shonk View Post
      I dont want g.imp thankz
      I thought that you liked those?

      Sky Fibre Unlimited Pro: Connected at 80,000 kbps / 20,000 kbps
      Previous ADSL2+ Speed 19999 kbps 1153 kbps, Line Attenuation 17.5 db 6.9 db, Noise Margin 7.5 dB 8.7 dB
      Speedtest: 17.15MB/s 0.97Mb/s Ping 31 ms

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