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    Upstream attenuation halved?

    This is a discussion on Upstream attenuation halved? within the Sky Broadband help forums, part of the Sky Broadband help and support category; I understand. It would though have to mean that whatever affected my line, did so during the 6 days that ...

    1. #51
      gymno's Avatar
      gymno Guest
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      Re: Upstream attenuation halved?

      I understand.
      It would though have to mean that whatever affected my line, did so during the 6 days that dlm ran.
      I therefore have to say i doubt it


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    3. #52
      snadge's Avatar
      snadge is offline Sky User Member
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      Re: Upstream attenuation halved?

      well...its funny because when I first got connected and called sky and ask them to "un-cap" my line so I could get more speed, he did so and I too ended up with 6.1db Margin and 18,012k sync speed and I thought they had changed the TSRNM to 6db or something (aswell as other changes) but I believe they cant, and right enough some time later it was back at 7db but same sync speed - ive never had those speeds since I had problems when i was moved to SVBN, now Im getting 16,500k @ 7db

      ive been told that sky's DLM can now set 3db noise margins and will do so if it see the line can handle it,

      maybe whats happening with yours is there is 1db worth of noise thats bringing it down immediatley after re-sync - it could be that it fixes the speed and noise margin at 7db irrespective of the amount of noise on the line (unless its an amount that will cause problems and therefore it might/should set a higher noise margin)

      next time I see mine at 6db I will reboot and see if it goes back to 7db..
      Last edited by snadge; 11-09-12 at 09:34 PM. Reason: added "speed and noise margin" to make it more clear
      - Hardware - Netgear DG834Nv1
      - Line Attenuation - 27.5db
      - Sync Rate - 17,600k
      - Noise Margin - 7db
      - Latency - 28ms

    4. #53
      gymno's Avatar
      gymno Guest
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      Re: Upstream attenuation halved?

      Kicked off early & worse today
      These tests are all 6 seconds apart:

      PING 212.58.241.131 (212.58.241.131): 56 data bytes
      56 bytes from 212.58.241.131: icmp_seq=0 ttl=247 time=270.9 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=247 time=245.4 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=247 time=268.6 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=247 time=267.1 ms

      --- 212.58.241.131 ping statistics ---
      4 packets transmitted, 4 packets received, 0% packet loss
      round-trip min/avg/max = 245.4/263.0/270.9 ms


      PING 212.58.241.131 (212.58.241.131): 56 data bytes
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=247 time=268.5 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=247 time=271.7 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=247 time=272.5 ms

      --- 212.58.241.131 ping statistics ---
      4 packets transmitted, 3 packets received, 25% packet loss
      round-trip min/avg/max = 268.5/270.9/272.5 ms


      PING 212.58.241.131 (212.58.241.131): 56 data bytes
      56 bytes from 212.58.241.131: icmp_seq=0 ttl=247 time=225.7 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=247 time=237.1 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=247 time=224.3 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=247 time=99.6 ms

      --- 212.58.241.131 ping statistics ---
      4 packets transmitted, 4 packets received, 0% packet loss
      round-trip min/avg/max = 99.6/196.6/237.1 ms


      PING 212.58.241.131 (212.58.241.131): 56 data bytes
      56 bytes from 212.58.241.131: icmp_seq=0 ttl=247 time=24.1 ms
      56 bytes from 212.58.241.131: icmp_seq=1 ttl=247 time=24.8 ms
      56 bytes from 212.58.241.131: icmp_seq=2 ttl=247 time=25.3 ms
      56 bytes from 212.58.241.131: icmp_seq=3 ttl=247 time=24.6 ms

      --- 212.58.241.131 ping statistics ---
      4 packets transmitted, 4 packets received, 0% packet loss
      round-trip min/avg/max = 24.1/24.7/25.3 ms

      Grrr.

      *edit- Just putting out there how bad it is.
      I know it's for me to sort out with sky now.
      I won't spam this thread anymore, but will post if i get a result.

      Forgot to mention.
      Online speed testers were showing 5mb / 0.1mb while all that ^ was going on.
      Normally get 17mb / 1mb.
      Last edited by gymno; 12-09-12 at 08:41 PM.

    5. #54
      gymno's Avatar
      gymno Guest
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      Re: Upstream attenuation halved?

      Network team will be notified tomorrow & will report back (to me no less!) on exchange capacity / congestion status.

      I've also been asked to call back again while the pings are going ballistic (shouldn't be long now) for some tests to be done.

    6. #55
      snadge's Avatar
      snadge is offline Sky User Member
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      Re: Upstream attenuation halved?

      at least you have someone trying to help,

      its defo a congestion/capacity issue that though...without a doubt! - but like ive said before, there should be a threshold they set to say WHEN they do anything about it and dependant on workload WHEN it gets done...unfortunately!

      sky have had a run of great offers since Xmas last year and this has caused a massive sudden increase in custom, it seems to me that they little prepared for what came about and now some exchanges suffer, temporarily of course (well I hope anyway)

      must be frustrating if your a gamer.

      whats your upstream attenuation doing between resync's?
      - Hardware - Netgear DG834Nv1
      - Line Attenuation - 27.5db
      - Sync Rate - 17,600k
      - Noise Margin - 7db
      - Latency - 28ms

    7. #56
      gymno's Avatar
      gymno Guest
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      Re: Upstream attenuation halved?

      Cheers snadge

      Attenuation figures don't change real-time on my router, but I've forced 5 re-syncs since dlm finished:

      Upstream attenuation
      DLM 14.2db
      reboot 12.8db
      reboot 10.0db
      New router, psu & adsl cable 14.3db
      reboot 14.3db
      Original router, psu & adsl cable 11.8db

      It's hardly a comprehensive test as i daren't do any more reboots, but it may be that my original router is at fault.
      The last 4 re-syncs were done within 45mins, around 10am with perfect pings & throughput.

    8. #57
      snadge's Avatar
      snadge is offline Sky User Member
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      Re: Upstream attenuation halved?

      whats ur downstream atten again? (just so I know what your upstream should be about - 14.3db (up) seems a little high if you have 20Mb syncs normally

      but certainly shouldnt be fluctuating between 10-14,3db...no way - i reckon it would probably do it on your new router too if you tried a few more times (dont though) I got it across all routers but it DID seem more fluent on my Netgear's 834GT + 834N than on the 2504n - now it stays put on all my routers

      did u say you had a post on sky forums? - might be worth making a post on there asking for other users with high pings to report upstream attenuation between 3-4 reboots - see if they have same issue, need to remember that theres two scenarios here, so its possible some may not get upstream attenuation fluctautions with reboots

      1. CONGESTION - could it be possible an ISAM is not over-loaded capacity wise, but is being used heavily by its customers to the extent its causing congestion anyway.
      2. OVERLOADED/CAPACITY - could it be possible the ISAM is over-loaded capacity wise so that general 'average' use by those customers is causing congestion (and these UAF's = Upstream Attenuation Fluctuations)

      I refer the UAF's to the overloaded capacity scenario because thats what the sky engineer told my rep was happening when i was getting the UAF's
      - Hardware - Netgear DG834Nv1
      - Line Attenuation - 27.5db
      - Sync Rate - 17,600k
      - Noise Margin - 7db
      - Latency - 28ms

    9. #58
      gymno's Avatar
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      Re: Upstream attenuation halved?

      ADSL Link Downstream Upstream
      Connection Speed 19992*kbps 1172*kbps
      Line Attenuation 23.0*dB 11.8*dB
      Noise Margin 5.8*dB 9.6*dB

      Attenuations started of at 22.5db / 13.9db when i first joined sky a year ago.
      Downstream only moves in 0.5db increments, so a slight increas on both sides seems normal to me.
      DLM did finish on 22.5db / 14.2db.

      I haven't posted on the sky forums.

      Upstream attenuation has been as low as 6.2db before dlm ran.
      It went as low as 8.6db during dlm & would've been set at 4am.

      I'm expecting a call from cst or the network team today, re: exchange status.
      Cst have hard evidence of my pings from their testing when i called them back last night & have passed that on to the network team

    10. #59
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      Re: Upstream attenuation halved?

      And the chocolate biscuit goes to...

      Snadge!
      Congratulations.

      A network chap called today & after testing & having spoken to "the guys in London", confirmed that the equipment is overloaded.
      It's not actually at my exchange, as that's the last in a chain after 2 other "points - not actual exchanges", but at the one before it.
      The London guys have known about it for a while & a "1 gig card" has already been installed & successfully tested for a week.
      Ordinarily, a card will go live about 1 week after this test, but the chap couldn't get the London guys to commit to that, so at present it's the original date of 11th october.
      He's going to update me of when the live date is & aalso call me shortly after to check that it's solved my issues.

      Result

      I may have had a rocky ride with my line (since day 1) but cst do get things done.

    11. #60
      snadge's Avatar
      snadge is offline Sky User Member
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      Re: Upstream attenuation halved?

      well done...!!

      one thing I will say is sky do seem to go to great lengths to sort out your problems, they are badly let down by BT openreach though - sky bent over backwards many times to help me and i was in direct contact with one of their Office Based SNS Engineers and someone at the CEO's office, the SNS Engineer was brill as he knew his stuff and understood the things I was on about with SNR/QLN, Wideband Noise and Upstream Atten flux over time and said he would not rest until it was fixed, he even rang to give me a heads up to let me know the 7th engineer that was "on his way" had a bit of an attitude and seemed reluctant to do the job, he said just let him do what he wants and we'll get someone else in with a SNS Engineer on site (Sky Network Services) - right enough he was a right piece of work, very rude and condescending, i pushed and pushed him though and he did eventually fix my problem a few days later....split leg!

      ah well at least we know it was overloaded and is getting fixed - soon as its remedy monitor your upstream atten between syncs and i bet it stays put.
      gymno likes this.
      - Hardware - Netgear DG834Nv1
      - Line Attenuation - 27.5db
      - Sync Rate - 17,600k
      - Noise Margin - 7db
      - Latency - 28ms

     

     
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