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    Sudden 5000Kbps drop in fibre download speed.

    This is a discussion on Sudden 5000Kbps drop in fibre download speed. within the Sky Broadband (Fibre) Help forums, part of the Sky Broadband help and support category; Hi all, Been on the Phone to sky over the last week or so about a sudden drop in our ...

    1. #1
      orbiter's Avatar
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      Sudden 5000Kbps drop in fibre download speed.

      Hi all,

      Been on the Phone to sky over the last week or so about a sudden drop in our DL speeds, from what was a steady (almost permanent) 40000Kbps connection, to a sudden 5000Kbps drop last week to 34999Kbps.

      I have tried two routers over the last week or so, both plugged into my BT test socket (thus no internal phone wiring connected) I usually use a Billion 8800axl R2 which is great, but I reverted to my old sky SR102 to test (I don't normally use this as it can only do 20Mbps DL on WiFi.) Anyway.. Both
      routers after a reboot show this dropped DL speed of 34999kbps. However for almost a year now (ever since we signed up for Sky Fibre.) These routers would both sync between 39990 & 40000kbps, and online speed tests would show around 38M00Kbps plus which was fine.

      Openreach came to the cabinet one day least week and our BB was off for about 10 minutes. Openreach apparently reported to Sky that the line was ok. However I don't agree and argued my point to a Sky adviser later that day, she proceeded to tell
      me that our line was fine and that our new 5Kbps LOWER speed of 34000Kbps was fine and should be acceptable. I have since called again NOT HAPPY, and now have a specialist Sky engineer coming on the 11th September to hopefully fix it, as 5Mbps is a lot to loose
      IMHO especially when your regularly downloading files that are up to 100GB or more each.

      I believe perhaps something has gone wrong at the exchange, perhaps equipment failure or a setting that has adjusted itself somewhere. As a specific 5000Kbps drop and sync speed of 34999Kbps from an almost permanent 40000Kbps seems weird. Any Ideas guys?

      Thank you


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    3. #2
      tenar's Avatar
      tenar is offline Sky User Member
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      Re: Sudden 5000Kbps drop in fibre download speed.

      most likely over saturation at cabinet as new people added can drop speeds as noise levels go up as more added but maybe line issue causing higher noise but line test may not pick up faults, was a sky engineer or openreach booked ? as sky engineer can only check internal setup did you get any previous and new line attenuation and noise margin readings?

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    5. #3
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      Re: Sudden 5000Kbps drop in fibre download speed.

      Quote Originally Posted by tenar View Post
      most likely over saturation at cabinet as new people added can drop speeds as noise levels go up as more added but maybe line issue causing higher noise but line test may not pick up faults, was a sky engineer or openreach booked ? as sky engineer can only check internal setup did you get any previous and new line attenuation and noise margin readings?
      Hi.. Sorry for the delay.. Yes saturation could possibly be an issue however this 5Mb loss happened literally overnight.
      An Openreach engineer came and checked the line and wired etc in the cabinet, but said everything was ok.
      Sky are sending one of their engineers, however I did tell them that both routers (SR2 & Billion 8800axl R2) show the same stats whether internal phone system is connected, or router is plugged directly into test socket, so it's not internal.

    6. #4
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      Re: Sudden 5000Kbps drop in fibre download speed.

      It can depend on distance from exchange and users per square mile. Mine sits at 72mbs down and 20 up and rarely changes because I live in a smaller town and this wont vary much ever. However I would imagine in a city this would potentially drop the more users per exchange. Still shoddy by sky to drop service due to demand though.

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    8. #5
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      Re: Sudden 5000Kbps drop in fibre download speed.

      Yes, especially as Skys ads state 'we'll never slow you down'.
      Anyway it seems there are bigger issues now as around 10 minutes after my last post. The broadband and phones service went down in our area (LCFOM) & 3 hours later we are still without both services.
      Its probably not the case but I'm hoping that whatever has failed to cause today's outage is responsible also for the speed issue we're having.

    9. #6
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      Re: Sudden 5000Kbps drop in fibre download speed.

      Sounds to me as if your line is just slowing down due to crosstalk.

      It may help if you posted router statistics so we can see if you are locked at the target SNR, etc.

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    11. #7
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      Re: Sudden 5000Kbps drop in fibre download speed.

      Sounds like a full cabinet or some kind of Crosstalk, as above.
      Have you checked on the Openreach dlschecker to see if your cabinet is full.
      Go here and select Address checker.
      https://www.dslchecker.bt.com/

      If your cabinet is full or near to full it will show that under Availability.
      There could also be a description under the table saying there is a Waiters list.

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    13. #8
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      Re: Sudden 5000Kbps drop in fibre download speed.

      Sounds like a cross talker to me. Does the OP know his vdsl cab type out of interest..
      Last edited by skyeci; 11-09-19 at 06:48 PM.
      billion 8800nl V1 (bridge mode)
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      click for line stats by pi3/ECI CAB

      click for line stats by Pi3/Huawei CAB

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    15. #9
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      Re: Sudden 5000Kbps drop in fibre download speed.

      I don't know the cabinet type but I've put a pic at the bottom if it helps...

      Ok guys so the Sky Engineer came out yesterday and said that our line was fine, but we had indeed been reduced, or capped (like DLM used to do.) So he rang the bods etc at Sky who after giving them some good SNR numbers told him that they'd
      have the message put through to Openreach to trigger the reset or whatever it is they do to get our 39999kbps sync speed back

      So on to today.. it seems the adjustment has taken place now, except that instead of having 39999kbps speeds reinstated. It seems further reductions have taken place as we've now lost a further 2600kbps to 32399kbps. So in all now
      we've lost 7.6Mbps in total, approaching 22% of our DL speed. This is getting a bit silly now. I mean if it drops much more pretty soon it'l be the same as a standard copper BB line Oh well.. Back on the phone to
      Sky again tomorrow.


      Sudden 5000Kbps drop in fibre download speed.-2019-09-12_203444.jpg

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      Re: Sudden 5000Kbps drop in fibre download speed.

      Nice Huawei cab. Leave it a few days. If you have had a dlm reset you will have probably lost g.inp on the line and potentially any lower db profiles which can lift speed that may have been in use...
      If it was me I would wait till dlm puts g.inp back on the line and hopefully uses lower db profiles to lift your sync back towards where it was... you may still lose some of your sync overall due to the additional cross talk you may have picked up...

      Have a look at your modem stats if using the billion and see if g.inp has been removed....
      billion 8800nl V1 (bridge mode)
      Qotom i5 Opnsense with IPV6
      Asus RT-AC88U - as wap

      ECI CAB- G.INP disabled 8th April 2016


      click for line stats by pi3/ECI CAB

      click for line stats by Pi3/Huawei CAB

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