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Standard User slimj
(member) Wed 22-Jan-20 08:53:50
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Strange Noise Margin Fluctuation


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Hi all,

I have a weird issue with my VDSL connection that happens quite sporadically but I cannot figure out why. To explain...

I have a long line and usually my connection is pretty stable generally connecting at around 25Mpbs (or more if lucky!) with my noise margin stable at around 3-6db depending on the speed I'm connected at (this may fluctuate by around 1-2db during the day which is normal).

However, every once in a while, I drop my connection and it will struggle to reconnect at anything more than 17-20Mpbs - This is because the noise margin is fluctuating wildly every 5-10 secs between approx 3db and 14db. Eventually after half a day or so the noise margin stabilizes at around the higher db reading - if I do another reboot of the router it will reconnect at the lower speed again with the fluctuating noise margin!

If I reboot after a week or so or just leave it be until it resyncs, I regain the higher speeds and stable noise margin.

Does any one have any thoughts as it baffles me?!

Notes
- Approx 1.5km line length from cabinet.
- Netgear D6400 router, firmware up to date.
- Internal wiring is good, connected to master socket, no extensions.
- No changes in the household that may cause this issue from what I can see.
- Openreach have replaced my line to the DP and another span of cable close by over the past 2 years due to some issues. This if anything has improved my connection speeds slightly.
Administrator MrSaffron
(staff) Wed 22-Jan-20 09:40:15
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Re: Strange Noise Margin Fluctuation


[re: slimj] [link to this post]
 
Noise in the frequency range used by VDSL2 causing issues randomly

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User slimj
(member) Wed 22-Jan-20 09:56:42
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Re: Strange Noise Margin Fluctuation


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
Noise in the frequency range used by VDSL2 causing issues randomly


Likely to be REIN? I think one of our neighbours had an issue with this previously.


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