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Early Feedback from Openreach’s G.INP ECI Hybrid Fibre Trial

Wednesday, March 18th, 2020 (12:01 am) - Score 5,560
fibre broadband is here high bt street cabinet

Some early feedback from Openreach’s (BT) latest trial of ReTransmission (ReTx / G.INP) technology on Fibre-to-the-Cabinet (FTTC / VDSL2) based broadband ISP lines, specifically those using the operator’s UK estate of ECI street cabinets, has shown improvements in service speed and latency times (ping).

G.INP (ITU G.998.4) is an error correction solution that is designed to help resolve spikes of Electromagnetic Interference (impulse noise), which can improve a line’s stability and thus performance. The introduction of this technology can, on some VDSL2 lines, even sometimes produce a small increase in performance.

As we’ve reported before. The feature is nothing new to Openreach and they’ve had better luck getting it to work on their larger estate of Huawei based cabinets, but sadly the same cannot be said for those using kit from ECI. Various past attempts have been made to get G.INP working on ECI and all have run into problems.

Last month we reported that Openreach were preparing to give G.INP / ReTx another try on their ECI estate with a new trial (here), which has now started to go live. The good news is that early feedback from a number of Plusnet’s customers appears to be very promising (here).

Summary of Early G.INP (ECI) Feedback

“My downstream connection speed has jumped by around 7Mbps at the moment – interleaving was on prior to the resync and it is currently off [65742 downstream connection speed before resync, 72479 after].”

“My connection resynced about an hour ago, g.inp is on. Got an extra 7 meg on the download and 1 meg on the upload and 0 FECS since compared to about 10k every 5 mins before. Also latency is 0.27ms rather than 8ms before”

“Same here my router was interleaved at 58mbps last night, it’s now 64.8. My noise margin is 6.3 down and 6.1 up.”

“Just to say like everyone else’s my line has jumped from 38meg to 44meg this morning and the ping is now sitting at 10-13ms from 19-20ms, so a nice little increase on my long line.”

“I’m on a short ~149m line but my speed has increased by ~4Mbps and ping speeds reduced from ~12ms to 9.”

The results are good, although the key will be whether or not the upgrade causes any problems like we saw before (this may only become obvious once the trial expands). At present the plan seems to be to test this on up to around 100,000 lines via supporting ISPs (opt in). The trial itself is currently expected to run until around August 2020.

Success in this trial will be viewed primarily as a reduction in faults driven by an increase in stability and increase in speed. Assuming the results are as expected then the feature will remain enabled and deployed to their remaining ECI estate.

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By Mark Jackson
Mark is a professional technology writer, IT consultant and computer engineer from Dorset (England), he also founded ISPreview in 1999 and enjoys analysing the latest telecoms and broadband developments. Find me on Twitter, , Facebook and Linkedin.
Leave a Comment
16 Responses
  1. Dave Scott says:

    I am up for this anything that’s going improve my internet connection am up for it. I get 80/20 now I mean I completely happy with my Speed but if my ping down from 32 down 15 I am more then happy with this.

    1. Archie says:

      Your ping is really that high? (I know 32ms in reality is nothing!) when I was with BT getting 80/20 I was getting between 4-12ms to Google!

      Are you on fast profile? If not, I’d probably give them a ring!

    2. Dave Scott says:

      It also depends on the quality of the cable

  2. johnny says:

    I also on 80/20 with ping of 25 to 30 on uk gaming servers and 35 to 50 on eu gaming servers, so lower ping im all for !

  3. NE555 says:

    “Also latency is 0.27ms rather than 8ms before” – that must be a typo

    1. Mark Jackson says:

      Almost certainly, but they’re direct quotes.

    2. A_Builder says:

      8ms is quite good for FTTC anyway so maybe two typos?

      Anyway apparent progress on an old and annoying problem to many users.

    3. Alex Atkin says:

      They mean interleaving latency is reduced from 8ms to 0.27ms.

    4. Mark Jackson says:

      @A_Builder. I got 8ms on FTTC in a recent test, so not that odd.

    5. Kevin says:

      I agree with Alex Atkin

  4. Liam says:

    I get 6ms ping times on FTTC on Huawei cabinet my brother gets the same since we both on the same exchange.

  5. David says:

    My ping is 17ms on a FTTC connection approx 1.2miles from the cabinet. If this was to help increase my speeds from 5Mbps I’d be all in for it.

  6. Alex says:

    My pings on BT FTTC via a Huawei cabinet are:
    Google 9ms
    Fast.com 10ms
    bbc.co.uk 9ms
    1.1.1.1 10ms

    These are via a wireless Windows 10 laptop so potentially better on a wired connection.

  7. Eciuser says:

    It appears to work so why not just roll it out to the rest of us…. my isp is not taking part in the trial… no doubt many months of further waiting..
    2016 was the last time my eci line was running eci g.inp

  8. anon123 says:

    Hi, I’m connected to an ECI cabinet, does anyone know if I would be likely to have G.INP enabled if I switched my ISP from Talktalk to Plusnet?

    Would Plusnet need to enable G.INP for all FTTC connections on my cabinet?

    Are there any other ISPs offering to switch customers over to G.INP / ReTx, as part of the trial?

  9. daniel badman says:

    i am with plusnet do we as customers have to ask to be put on this trial or can we ask as i am on a 850 meter line and o think g.inp could help stop bursts of errors

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