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    Stability Boost as Openreach Eye G.INP Fix for ECI “Fibre Broadband” Cabs

    This is a discussion on Stability Boost as Openreach Eye G.INP Fix for ECI “Fibre Broadband” Cabs within the General Computing and Internet forums, part of the Community channel category; Stability Boost as Openreach Eye G.INP Fix for ECI "Fibre Broadband" Cabs - ISPreview UK Last year Openreach ( BT ...

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      Scubbie's Avatar
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      Stability Boost as Openreach Eye G.INP Fix for ECI “Fibre Broadband” Cabs

      Stability Boost as Openreach Eye G.INP Fix for ECI "Fibre Broadband" Cabs - ISPreview UK
      Last year Openreach (BT) was forced to stop a roll-out of Physical Retransmission ReTX (G.INP) technology, which can improve the performance of their FTTCfibre broadband” lines, because of problems with their ECI based Street Cabinets. The good news is that a fix has been found.

      Just to recap. G.INP (ITU G.998.4) is an error correction technology that is designed to help resolve spikes / bursts of Electromagnetic Interference (impulse noise), which can impact the stability and performance of VDSL2 lines (FTTC). Impulse noise generally comes in two main forms – intermittent and repetitive.

      Noise that occurs as sporadic, unpredictable events are termed Single High Impulse Noise Events (SHINE) and these often originate from turning an appliance on or off. Meanwhile impulse noise that is consistent is known as Repetitive Electrical Impulse Noise (REIN), which can be caused by all sorts of things from faulty power adapters to household dimmers etc.

      Suffice to say that G.INP can help to iron these problems out, which makes problematic lines more stable and less prone to errors. Improved line stability can also yield a small performance benefit for consumers. Some rival networks (e.g. Sky Broadband’s unbundled LLU platform) already support G.INP and in 2015 Openreach (BT) began a similar roll-out (here) but this didn’t go quite according to plan (here and here).

      As usual the technology worked fine on Openreach’s Huawei based cabinets, although the same could not be said for those lines being served by their footprint of ECI cabinets and certain VDSL modems. Under certain conditions the ECI lines could suffer a loss of speed, higher latency and a few users also complained of connectivity problems.

      Initially Openreach thought they had managed to develop a solution for this, although it soon became clear that there were still problems and the roll-out was ultimately suspended during early 2016.

      The ECI Fix


      The G.INP upgrade is an important enhancement and so Openreach has continued their efforts with ECI to find a proper solution. Recently ISPs have been told that a new fix has been developed and this is currently going through final testing before being piloted in the wild.

      A Spokesperson for Openreach told ISPreview.co.uk:

      “Openreach have been working very closely with our vendor to find a solution to the issues encountered last year during the rollout of G.INP on our ECI estate.

      We have now identified and lab tested a solution that will manage the circumstances where a line was previously becoming unresponsive under a specific set of conditions.”
      Openreach states that they expect to pilot the solution “later in the summer” and assuming all goes well then it will be deployed, which could begin as early as autumn 2017. However there is still a caveat for ECI kit, which has not been overcome.

      Retransmission can operate in both downstream and upstream channels simultaneously, although ECI equipment (either modems or DSLAMS) still doesn’t fully support upstream retransmission. “Due to a hardware limitation G.INP will only be enabled in the downstream direction which is where we also see most benefit for customers,” said Openreach’s spokesperson.

      Naturally we’ll be keeping an eye out for the first pilot and looking to see how it impacts line stability and connection latency.


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      skyeci's Avatar
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      Re: Stability Boost as Openreach Eye G.INP Fix for ECI “Fibre Broadband” Cabs

      following up on this as still not seen the return of the elusive G.INP on ECI. I stumbled upon an updated article on isp news.

      The update was added on 1st Feb 2018 - hopefully its finally good news for us ECI users and seems to indicate some success with lower SNR profile on the DS much like on Huawei.

      Even though I upload to mdws and check daily we still haven't seen any of our uploaders re-enabled after it was turned off back in April 2016.. Love to know where the 600,000 lines are....

      Will update as soon as I see one

      "UPDATE 1st Feb 2018
      We understand that so far the ECI Retransmission Trial has migrated around 600,000 lines and the official rollout is about to commence across their estate. The xdB (3dB profile) has also been successfully applied to some ECI lines"


      Billion 8800NL modem (bridge mode)
      Qotom i5 Opnsense with IPV6
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      ECI CAB- G.INP disabled 8th April 2016

      click for my ECI line stats

      click for line stats by Pi3/Huawei

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