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    Attenuation and noise margin

    This is a discussion on Attenuation and noise margin within the Sky Broadband help forums, part of the Sky Broadband help and support category; Morning, We've never had fast broadband due to our distance from the exchange. Normally it's been stable at 0.5 mb, ...

    1. #1
      markmunk's Avatar
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      Attenuation and noise margin

      Morning,

      We've never had fast broadband due to our distance from the exchange. Normally it's been stable at 0.5 mb, which while modest was fine for our needs.

      Recently connection speeds dropped drastically to 0.1 mbps, sky are in the process of addressing this and so far they've been great.

      Last night I was told we'd been switched over to a new system (sv something) which required some reconfiguration to our line that could take up to 48 hours, yielding much improved sync speeds.

      Every cst member I spoke to was amazed our speed was so slow and said their line tests indicated 2 mbps should be possible.

      Our router is connected into the master socket via a micro filter.

      The line stats are:

      Attenuation 68db
      Noise margin 19db

      I admit I don't really know what these mean but should it really sync faster than 0.5 mbps?

      I think we might be unusual in that we don't unrealistically expect lightning fast speeds, but wouldn't mind at least 1 mbps if possible.


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    3. #2
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      Re: Attenuation and noise margin

      If your downstream noise margin is 19dbs, that indicates that your connection is heavily capped. It is possible that this margin is necessary to keep your line stable, but it does seem to be very high. You should call Sky and ask them to lift the cap on your line to give you a bit more speed. You are on ADSL2+ which may not suit your line too well and cause excessive errors, ask them if they can try it on G.DMT(ADSL1) to see if it helps your connection.

      TomD


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    4. #3
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      Re: Attenuation and noise margin

      mate iv had the same problims and they havnt been able to find the problim, saying that ur noise margin is way higher than mine so donno is the problim will be the same but hope ya get it sorted.

    5. #4
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      Re: Attenuation and noise margin

      Quote Originally Posted by anton7350 View Post
      mate iv had the same problims and they havnt been able to find the problim, saying that ur noise margin is way higher than mine so donno is the problim will be the same but hope ya get it sorted.
      Your problem is completely different to this.
      This looks like a simple capping problem with a noise margin of 19db indicating you have plenty of noise in reserve to increase the speed. I agree 100% on isitme's suggestions!

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      Re: Attenuation and noise margin

      Thanks for the replies. We had some reconfiguration on the line, following advice here which matched what sky support suggested to.

      Long story short we completely lost connection and eventually they got it back but out was only at 0.1 mbps, which is where it's still at now.

      We have an engineer coming this afternoon to check hardware, wiring and possibly replace our prehistoric master socket. Will update after.

      Sky have been really helpful so far.

    7. #6
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      Re: Attenuation and noise margin

      Not so happy now.

      A wasted afternoons leave from work waiting for an engineer who never showed up. Called sky and was told the engineer had fixed it without coming to the house, sending me a text message to tell me.

      Needless to say no message received, and far from being fixed the internet connection is gone completely now.

      Sky apologized and another engineer is supposedly coming monday with instructions to actually knock on the door!

      My partner is disabled and she relies on our internet connection to stay in contact with people.

      I suppose a few more days without connection isn't the end of the world, I'm just left feeling disappointed.

      Our broadband was fine until sky upgraded us, then suddenly it stops working.

    8. #7
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      Re: Attenuation and noise margin

      Did you get them to put your line onto G.DMT?

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    9. #8
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      Re: Attenuation and noise margin

      I asked, they said it was an issue with our line hence the engineer.

      After the rescheduled visit on Monday, assuming it's not fixed, I'll call back and ask again.

      We've managed to regain a connection (after leaving the router offline for a few hours) but it's still synching around 0.2mbps. At the moment though we'll take anything we can get

      Thanks again for the input.

    10. #9
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      Re: Attenuation and noise margin

      Personally, I just think you're better off with mobile broadband if it none of the solutions ever work tbh or another ISP if you aren't having any luck with your connection?

      But you don't have to go with it though, its just an idea.

    11. #10
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      Re: Attenuation and noise margin

      Mobile broadband is the worst form of broadband you can get! I'd go so far as to say dial-up is more reliable/stable.

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