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    Pings & G.INP

    This is a discussion on Pings & G.INP within the Sky Broadband help forums, part of the Sky Broadband help and support category; This thread has absolutely nothing to do with G.INP. Apologies to anyone reading this who may have thought otherwise. I've ...

    1. #1
      gymno's Avatar
      gymno Guest
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      Pings

      This thread has absolutely nothing to do with G.INP.

      Apologies to anyone reading this who may have thought otherwise.

      I've considered myself quite fortunate since 5th july, when DLM trained my line to give pings of 15ms to bbc.co.uk & google.com + generally no higher than 22ms to other uk addresses.

      Today though & without any resyncs i noticed they'd jumped to 21ms.
      Ok, no big deal.
      After a little testing i decided to reboot the router & now they're at 26ms.
      It's across the board too. Skyuser was 22ms - now 34ms.

      There's definitely nothing showing in the logs other than the reboot i did, so i was wondering...

      Firstly, are impulse noise protection (INP) & interleaving depth (ID) merely different terms for the same thing?

      Secondly, the new(ish) G.INP means that the level of protection imposed can be variable right?
      IE: it doesn't need DLM to resync the connection to apply a different value & just changes when needed?

      If so, i assume that's what's happened here.
      I guess i'm mostly intrigued by exactly how variable it is, so without a resync, can it change by the day, hour, minute or instantly?

      Really though i just hope my pings go back down.
      Last edited by gymno; 01-07-15 at 09:19 PM.


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    3. #2
      buddbuttocks's Avatar
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      Re: Pings & G.INP

      INP and interleave depth work in tandem, but they are different things. Interleaving is more intended to mitigate errors on lines that are fundamentally weak - you will see this is working whenever there are FECs accumulating (forward error correction)

      Whereas INP offers some protection against impulse noise such as intermittent crackling.

      I'm not entirely sure how G.INP works, but it's something to do with the retransmission of data when there actually is a CRC error.

    4. #3
      gymno's Avatar
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      Re: Pings & G.INP

      Thanks.

      I'd always thought INP & ID were separate entities & a little research today seemed to confirm it.
      Just read something different the other day.
      Must have been the ramblings of a mad man.

      Would you happen to know if ID levels & max delays can only be altered with a resync?

      edit
      I should say, i'm still on the v6_UNI firmware & a new v7 started going out last wednesday.
      Just in case that was of any significance.

      edit2
      Also, to be more accurate, pings to bbc & google are more like 27ms.
      This is typical:

      56 bytes from 212.58.241.131: icmp_seq=0 ttl=248 time=26.7 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=248 time=27.1 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=248 time=27.1 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=248 time=26.7 ms

      So, 15ms > 21ms = 6ms jump.
      Then after rebooting, 21ms > 27ms = 6ms jump again.
      Last edited by gymno; 14-01-14 at 06:12 PM.

    5. #4
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      Re: Pings & G.INP

      I think those values will only change at sync up time. Certainly for Sky at least. I haven't looked into it much but I don't think the auto INP setting will make it dynamically change while connected.

    6. #5
      gymno's Avatar
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      Re: Pings & G.INP

      Thanks again buddbuttocks.

      I should also point out that i haven't noticed any noise margin fluctuations & throughput speeds are normal.
      The line has been absolutely fine.

      Being a gamer, i'm a bit nerdy with ping & do a test every day - that's why i clocked it.

      Intriguing...

    7. #6
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      Re: Pings & G.INP

      Could you set up the Quality Meter on your line please?

      I wonder if an issue is developing or just that your line isn't working as well as it used to.

      thinkbroadband :: The UK's largest independent Broadband / ADSL troubleshooting website (incorporating news, reviews and comparisons)

      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

    8. #7
      gymno's Avatar
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      Re: Pings & G.INP

      My line isn't working as well as it used to.
      But it's doing so in a quite specific manner.
      I doubt there's an issue developing.

      My exchange (or rather the exchange i'm daisy chained to) was upgraded october last year, due to congestion problems.

      Current throughput speed:
      http://speedtest.uk.net/result/444745/

      Current router stats:
      Broadband Link Downstream Upstream
      Connection Speed 21860*kbps 1157*kbps
      Line Attenuation 22.5*dB 13.9*dB
      Noise Margin 6.0*dB 8.9*dB

      It's only this that's changed:
      PING 212.58.241.131 (212.58.241.131): 56 data bytes
      56 bytes from 212.58.241.131: icmp_seq=0 ttl=248 time=26.5 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=248 time=26.7 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=248 time=26.7 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=248 time=27.5 ms

      Used to be 14.5ms -16.0ms, not 27ms.

    9. #8
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      Re: Pings & G.INP

      Hmmm, i wonder if the routing may have changed?

      bbc benchmark & others are still high:
      56 bytes from 212.58.241.131: icmp_seq=0 ttl=248 time=27.3 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=248 time=26.3 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=248 time=27.1 ms

      But plucked this IP from a reverse traceroute:
      56 bytes from 141.136.111.245: icmp_seq=0 ttl=62 time=16.4 ms
      56 bytes from 141.136.111.245: icmp_seq=1 ttl=62 time=16.4 ms
      56 bytes from 141.136.111.245: icmp_seq=2 ttl=62 time=15.7 ms

      So it's still capable of sub 16ms...

      It's times like this that i wish i had bought that cheap second hand laptop, so i could get some cmd prompts on the go.

    10. #9
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      Re: Pings & G.INP

      Well it's good to know it's not my line & therefore out of my hands.

      Found this ping test comparison i did to bbc & one of skys cache servers back in july in this post:
      2.127.251.89 = 24-29ms
      212.58.241.131 = 15ms
      Now:
      56 bytes from 2.127.251.89: icmp_seq=0 ttl=60 time=25.3 ms
      56 bytes from 2.127.251.89: icmp_seq=1 ttl=60 time=23.7 ms
      56 bytes from 2.127.251.89: icmp_seq=2 ttl=60 time=24.2 ms
      56 bytes from 2.127.251.89: icmp_seq=3 ttl=60 time=24.5 ms

      56 bytes from 212.58.241.131: icmp_seq=0 ttl=248 time=26.9 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=248 time=26.6 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=248 time=27.1 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=248 time=26.6 ms

    11. #10
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      Re: Pings & G.INP

      Does anyone know what might be causing this?

      Latency is still higher than what i've been used to for 6 months, but not to every ip address.
      bbc.co.uk was 15ms now 27ms
      google.com was 15ms now 21ms
      skyuser.co.uk was 22ms now 34ms

      Reverse traceroute:
      Hop (ms) (ms) (ms) **** IP Address Host name
      1* **0* **0* **0* **** 8.9.232.73 *xe-5-3-0.edge3.dallas1.level3.net *
      2* **104* **104* **104* **** 4.69.145.62 *vlan60.csw1.dallas1.level3.net *
      3* **104* **105* **105* **** 4.69.151.130 *ae-62-62.ebr2.dallas1.level3.net *
      4* **103* **103* **104* **** 4.69.137.122 *ae-3-3.ebr2.newyork1.level3.net *
      5* **104* **104* **104* **** 4.69.148.42 *ae-82-82.csw3.newyork1.level3.net *
      6* **104* **104* **104* **** 4.69.134.73 *ae-81-81.ebr1.newyork1.level3.net *
      7* **104* **105* **104* **** 4.69.137.73 *ae-43-43.ebr2.london1.level3.net *
      8* **104* **104* **104* **** 4.69.153.134 *ae-57-222.csw2.london1.level3.net *
      9* **103* **103* **103* **** 4.69.166.29 *ae-232-3608.edge4.london1.level3.net *
      10* **104* **103* **103* **** 195.50.122.114 * - *
      11* **Timed out* **Timed out* **Timed out* **** * - *
      12* **129* **127* **127* **** 90.204.192.155 *5accc09b.bb.sky.com *

      I still get pings of 16ms to 4.69.137.73 & 4.69.153.134 (hops 7 & 8) though.
      Also 16ms to 141.136.111.245, another ip a few hops before my exchange on a different sites reverse traceroute.

      Am i right in assuming that this rules out any kind of line or exchange anomaly & must be something happening somewhere further along the network?

      There's no variance, depending on time of day & of all the sites i ping, they'll either be up 6ms, up 12ms or unchanged.
      All the sky cache servers listed in this post are unchanged at 24ms.
      Last edited by gymno; 16-01-14 at 01:31 PM.

     

     
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