Your forum username:
Do you already have an account?
Forgot your password?
  • Log in or Sign up


    Welcome to Sky User - The Unofficial Support Forum for everything Sky! - Proudly helping over 65k members.


    Advertisement

    Results 1 to 5 of 5

    Noise Margin Dropped

    This is a discussion on Noise Margin Dropped within the Sky Broadband help forums, part of the Sky Broadband help and support category; My noise margin has dropped to around 3db and has been there for a few days now, I thought the ...

    1. #1
      alflavor's Avatar
      alflavor is offline Sky User Member
      Exchange: Whittlesey
      Broadband ISP: Sky Broadband Unlimited
      Router: D-Link DSL-2640S
      Sky TV: Sky+ HD
      Join Date
      Jan 2011
      Posts
      39
      Thanks
      7
      Thanked 0 Times in 0 Posts

      Noise Margin Dropped

      My noise margin has dropped to around 3db and has been there for a few days now, I thought the line fix that I had done had stopped this!

      But my connection seems very strong, I am connected at 11500, and am getting 9.5-9.8 on speedtests. Also HD streaming to Apple TV, Spotify, iPlayer all working flawlessly...

      I am not plugged into the main socket, but intend to move it there soon, then run the connection back upstairs with a homeplug.

      Do I need to worry about the margin, if as I say the connection seems to be holding up nicely?


    2. Advertisement
    3. #2
      Scubbie's Avatar
      Scubbie is offline Sky User Moderator
      Exchange: 02392
      Broadband ISP: Sky Fibre Unlimited
      Router: Sky Q Hub ER110
      Sky TV: Sky+HD box
      Join Date
      Mar 2010
      Location
      Near Portsmouth
      Posts
      27,907
      Thanks
      812
      Thanked 2,195 Times in 2,065 Posts

      Re: Noise Margin Dropped

      Changes like that can be caused by a number of things. since you intend to move your router soon and any changes made could be voided once you move it, could you try plugging your router into the test socket and posting your full stats?

      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

    4. #3
      alflavor's Avatar
      alflavor is offline Sky User Member
      Exchange: Whittlesey
      Broadband ISP: Sky Broadband Unlimited
      Router: D-Link DSL-2640S
      Sky TV: Sky+ HD
      Join Date
      Jan 2011
      Posts
      39
      Thanks
      7
      Thanked 0 Times in 0 Posts

      Re: Noise Margin Dropped

      Although not in test socket right now, my stats are:

      ADSL Link Downstream Upstream
      Connection Speed 11262 kbps 1032 kbps
      Line Attenuation 20.5db 11.3db
      Noise Margin 1.9db 7.8db

      Yet everything seems fine, I would have thought this would mean frequent disconnections?

      Uptime of router is currently 215 hours and counting..

      Thanks for your help by the way.

    5. #4
      I_Hate_Sky_Awnsers's Avatar
      I_Hate_Sky_Awnsers is offline Sky User Member
      Exchange:
      Broadband ISP: Virgin Standard
      Router: Non Sky Router
      Sky TV: Virgin
      Join Date
      Mar 2011
      Posts
      965
      Thanks
      2
      Thanked 59 Times in 57 Posts

      Re: Noise Margin Dropped

      Are you using the white Netgear DG834GT? think that they tend to hold sync with a lower noise margin.

      The most likely issue effecting the noise margin is internal wiring.

      try connecting the router to the test socket and post the stats from there

      Could also depend on the time of day that you took those stats noise margins can drop a couple of db in the evening

      Other possibilities affecting the noise margin can be street lights

      Also have a look at the link in my signature for REIN, although its unlikely its possible but normally if that was what was effecting the connection it would loose sync
      Links Router Stats Useful Tutorials Speed Test Check For Test Socket Repetitive Electrical Impulse Noise

      Results from http://www.speed.io (Copied on 2011-04-08 16:36:58)
      Download: 50000 Kbit/s Upload : 4361 kbit/s Connects : 2446 conn/min Ping: 21 ms

    6. #5
      Scubbie's Avatar
      Scubbie is offline Sky User Moderator
      Exchange: 02392
      Broadband ISP: Sky Fibre Unlimited
      Router: Sky Q Hub ER110
      Sky TV: Sky+HD box
      Join Date
      Mar 2010
      Location
      Near Portsmouth
      Posts
      27,907
      Thanks
      812
      Thanked 2,195 Times in 2,065 Posts

      Re: Noise Margin Dropped

      Quote Originally Posted by alflavor View Post
      Although not in test socket right now, my stats are:

      ADSL Link Downstream Upstream
      Connection Speed 11262 kbps 1032 kbps
      Line Attenuation 20.5db 11.3db
      Noise Margin 1.9db 7.8db

      Yet everything seems fine, I would have thought this would mean frequent disconnections?

      Uptime of router is currently 215 hours and counting..

      Thanks for your help by the way.
      The stats are useful.

      As for 'router uptime' be careful about confusing this with WAN & LAN uptime. We are interested in both as WAN being less than the LAN would indicate a problem with the line, whilst both could indicate a problem with the router.

      The noise margin is very low in the above figures in my mind. Sky sets a minimum of 7dB. Below 5dB tends to indicate an issue.

      If you could check the figures in the test socket, it may indicate whether there is an issue with your internal wiring now we have these figures to compare.

      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

     

     

    Tags for this Thread

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •  
    SkyUser - Copyright © 2006-2017. SatDish and NewsreadeR | SkyUser is in no way affiliated with Sky Broadband / BSkyB
    RIPA NOTICE: NO CONSENT IS GIVEN FOR INTERCEPTION OF PAGE TRANSMISSION