Noise Margin
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- Re: Noise Margin
Re: Noise Margin
04-02-2010 2:40 PM
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It had dropped to 3500 as of 13:09 so I moved our profile to match.
Re: Noise Margin
04-02-2010 4:05 PM
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Re: Noise Margin
05-02-2010 1:51 PM
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Re: Noise Margin
07-02-2010 1:57 PM
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Re: Noise Margin
08-02-2010 2:28 PM
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Edit, Any chance of a nudge ?
Re: Noise Margin
18-02-2010 11:33 AM
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Re: Noise Margin
18-02-2010 8:18 PM
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Re: Noise Margin
18-02-2010 8:39 PM
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Edit: And it has cost me a ps3 dualshock controller
Edit again : has lost sync a further 4 times
Re: Noise Margin
19-02-2010 2:53 AM
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That problem is viewed by the exchange DLM as a big interference in your stability, so it is actively trying to improve the stability by increasing the noise margin.
The downside is that this limits the sync speed, and gets reflected (immediately, and for a long time after) in the profiles and your download speed
The problem is, because this "fault" is largely invisible to you and goes away again, only the after-effects are visible to you: a slow download, low profiles, and changing sync speed.
If all you do is a resync and ask for the profiles to be fixed, then unfortunately, you are only ever going to cure the symptoms, and never cure the original fault.
You have my sympathy. This kind of intermittent problem is about the hardest thing for anyone to solve, and requires patience and a methodical approach.
Even if all you want to do is hand this off to one of BT's technician's, you're going to need patience - because it will be hard for him to find the fault, hard for him to fix the fault, and hard for you to know whether the fix has had any real effect.
I see you've tried routers, filters, and had a visit to check the NTE5. That's a start (OK, quite a way round the next lap too), but it looks like there's more work that's needed...
You've also got some good graphs out of RouterStats. They show the problem happening, but even they're not good enough to show the cause.
For example, the drop at 3:44 shows this to a tee. The sync drops for no apparent reason (certainly no serious dip in the noise margin). When it re-syncs, it does so with a high SNR level, suggesting that the exchange DLM has ordered this to be increased. Consequently the speed has decreased, and this will be immediately reflected in the profile and download speeds.
But no hint of why the sync dropped.
The drop at 5:09 has less consequences on either your sync speed or your profile, but there is still no indication why.
If you want to try to gather better evidence about the line, then I suggest that you try to augment the RouterStats graphs to also collect data about the number of errors being seen on the line. These will be displayed by the router (if at all available) as CRC or HEC. You may also see ES (Errored Seconds) figures too.
You might find that graphing these details will give you a better understanding of your line at the time it fails.
If nothing else, they'll give you a "before" picture, to allow you to assess whether any attempted BT-fix has actually had any impact on the line.
With 3 routers, they might also let you asses which router handles the line best... assuming you can get matching data out of all 3.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Noise Margin
19-02-2010 3:16 AM
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Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Noise Margin
19-02-2010 10:19 AM
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Re: Noise Margin
20-02-2010 1:12 AM
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Re: Noise Margin
20-02-2010 2:13 AM
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Re: Noise Margin
23-02-2010 9:48 AM
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Re: Noise Margin
23-02-2010 4:03 PM
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If you're getting a lot of these disconnections I'd definitely recommend raising us a fault at http://faults.plus.net
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