Noise Margin
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- Re: Noise Margin
Noise Margin
04-07-2009 6:04 PM
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My downstream noise margin recently went from a stable 6dB to a massive 17dB - upstream is sitting nicely at 5dB. Downstream line attenuation is 24dB. I've not had any noticeable problems with sync rate and I still get 7000 Kb.
Who do I need to talk to to get this changed? Is it plusnet or BT? Are there any tests on the line I can perform?
-tony
Re: Noise Margin
04-07-2009 6:41 PM
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iam on 50db atten and been up an down the noise margin ranges a few times now with out having to get BTw to reduce it like on 20cn
did you plug any thing in to the phone line or hav a thunder storm ect that might of caused the DLM to up your target
Re: Noise Margin
04-07-2009 8:19 PM
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I've just received a rather promising response from Plusnet (RA at BOT - DSL Logged Faults).
Quote I've now sent the fault to BT for further investigation and we'll keep you updated. We'll see if they can reduce the SNR and remove any banded profile first.
Does anyone know what a "banded profile" is?
"In The Beginning Was The Word, And The Word Was Aardvark."
Re: Noise Margin
05-07-2009 10:13 AM
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Nothing new plugged into the line, obviously had a few thunderstorms over the last few weeks but couldn't tell if there was any evidence of causality.
I'm running RouterStats and have been monitoring the SNR over the last 24hrs and it is now down to 14dB and hasn't actually been as stable as I thought. It's jumped around a bit between 17 and 12 quite a lot overnight before settingly back to 17 until 9 am when it dived down to 14 and has stayed there (maybe a graph would have been more appropriate than all that I'll investigate).
I've also installed a DGTeam firmware on my dg834g box as it is, apprently, less buggy and provides a few linetest options, however I've no idea what to run or why.
Re: Noise Margin
05-07-2009 12:58 PM
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Are you using the BT master socket?
"In The Beginning Was The Word, And The Word Was Aardvark."
Re: Noise Margin
07-07-2009 10:36 PM
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Is there any way to find out if BT have done any work in our area? I guess it could be the local loop. I'm connected to the HEATON MOOR exchange if by chance anyone else is connected to that.
Re: Noise Margin
08-07-2009 5:17 AM
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Re: Noise Margin
08-07-2009 8:00 AM
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In my case I did have a much better downstream sync or around 11-12Mbs and my upstream (since uncapping) has remained pretty stable at 1.2Mbs (thank you PN!) so I'm pretty sure my line is basically solid. I suspected that something was imposing a limit either automatically, such as some random decision by the DSLAM for who know's what reason, or manually by BT. Banding certainly appears to fit that.
Is there someone at PN I can contact to look into this?
Re: Noise Margin
08-07-2009 8:26 AM
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Re: Noise Margin
13-07-2009 8:23 AM
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After months on that, we had a power cut last Wednesday so the line reconnected and it looks as though the noise margin has dropped back to around 6db, which is where it used to be with ordinary ADSL. (Of course there's now an increase in the connection speed though the stable rate hasn't gone up up as yet.)
The point of this is that given time it seems it eventually goes back down to where it should have been all along, though in our case it was a via resynch caused by something beyond our control.
Full Fibre since September 2023
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