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    Replaced NTE5 and faceplate - improvement?

    This is a discussion on Replaced NTE5 and faceplate - improvement? within the Sky Broadband help forums, part of the Sky Broadband help and support category; If the trees are on your land, then you are responsible for them. You will be expected to pay out ...

    1. #11
      Scubbie's Avatar
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      Re: Replaced NTE5 and faceplate - improvement?

      If the trees are on your land, then you are responsible for them.

      You will be expected to pay out for a tree surgeon to do the work if it is on your land. If you are able, then it would be a good idea to do it yourself, but be careful near the telephone lines.

      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


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    3. #12
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      Re: Replaced NTE5 and faceplate - improvement?

      Thanks for all the help. Will be reporting the line out to BT as intermittently noisy and tell them about the trees. The trees are actually outside a neighbours' house, either on their property or unadopted land. Either way they are not my trees!

      Really weird pattern forming though. If I check S/N in the day it is always 13+dB, check again in the evening and it is always around 8.5dB. Why would my line be going noisy only in the evenings?! Haven't pinned down exactly when it changes but it does seem pretty strange to me.

      I've disconnected everything else from the phone line - telephone, sky box etc.

      Any thoughts?

      Cheers again,
      Rich.

    4. #13
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      Re: Replaced NTE5 and faceplate - improvement?

      The higher noise level during the day is normally a result from background noise generated by the Sun.

      The jump in your case is quite high though.

      If you are concerned about upsetting your neighbour, I suspect that there will be a legal condition somewhere to ensure that the trees are kept trimmed properly.

      I know that owners of hedges & trees by the roadside need to maintain them. This is a legal requirement.

      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

    5. #14
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      Re: Replaced NTE5 and faceplate - improvement?

      Thanks Scubbie, appreciate the reply. However my case is the exact opposite! S/N actually degrades in the evening, implying that either the noise is going up or the line signal is going down. Weird..

    6. #15
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      Re: Replaced NTE5 and faceplate - improvement?

      Quote Originally Posted by knighty76 View Post
      Thanks Scubbie, appreciate the reply. However my case is the exact opposite! S/N actually degrades in the evening, implying that either the noise is going up or the line signal is going down. Weird..
      You stated that it is 13+ during the day and 8.5dB in the evening.

      The higher the figure, the more interference there is on the line.

      Sky has a target noise margin of 7dB. Other ISPs have a target of 5dB which is lower.

      A higher noise margin will reduce the speed of your connection, but it will reduce any errors on the line.

      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

    7. #16
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      Re: Replaced NTE5 and faceplate - improvement?

      Hi Scubbie,

      Again thankyou for the help and I appreciate that you are an experienced member on here. But unless I'm missing the point the S/N ratio is a measure of the difference between the line signal and the noise floor. The dB value is a logarithm of the signal divided by the noise. Therefore higher noise level means lower S/N, and conversely a higher S/N means that the noise floor (or interference) is lower, or the signal is higher, either of which is a good thing because in transmission it's the gap between the two that gives you your usable dynamic range.

      I always thought in broadand terms a higher S/N was advantageous?

      Happy to be corrected if I'm wrong, but I'll be a bit worried if I am because I work in broadcast and design transmitters for a living...

      More's the point I don't really understand why the sun would cause my S/N to improve in the daytime, which is what is happening. But I really appreciate the help and suggestions.

      Regards,
      Rich.

    8. #17
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      Re: Replaced NTE5 and faceplate - improvement?

      SNR goes DOWN in the evenings as more interference is on the line - higher in the day as there's less noise
      -------------------------------------------



      Useful Sticky: - How To Obtain Your Router Stats, BT Speed Test, Check For Test Socket

    9. #18
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      Re: Replaced NTE5 and faceplate - improvement?

      Try downloading and running Routerstats Lite, see if you can pinpoint when the margin is dropping. If it always drops at a time in the middle of the night when you are not using it, you may be one of the few that would benefit from turning off your router at night.
      Internet Software

      You may also benefit from fitting an RF3 filter, but there is no guarantee. BT 80B RF3 Junction Box (3 way IDC to 3 way screw connectors with RFI protection)

      TomD


      Please note the views and recommendations in my posts are my own and in no way reflect the views of SkyUser.


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    10. #19
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      Re: Replaced NTE5 and faceplate - improvement?

      Quote Originally Posted by knighty76 View Post
      Hi Scubbie,

      Again thankyou for the help and I appreciate that you are an experienced member on here. But unless I'm missing the point the S/N ratio is a measure of the difference between the line signal and the noise floor. The dB value is a logarithm of the signal divided by the noise. Therefore higher noise level means lower S/N, and conversely a higher S/N means that the noise floor (or interference) is lower, or the signal is higher, either of which is a good thing because in transmission it's the gap between the two that gives you your usable dynamic range.

      I always thought in broadand terms a higher S/N was advantageous?
      You are correct

      Formulae attached
      Attached Files Attached Files
      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

    11. #20
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      Re: Replaced NTE5 and faceplate - improvement?

      Thanks for the help again guys, will run routerstats overnight and see what the pattern is. Might have a look at the RF3 filter aswell, nice one.

      Cheers,
      Rich.

     

     
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