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Standard User WilliamGrimsley
(member) Tue 07-Feb-17 15:04:29
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Is A Fault Developing On My Line?


[link to this post]
 
Hi guys,

I hope you don't mind me posting after some issues last month.

I think a fault is starting to develop on my line. I'm still uploading to MDWS under the ID WilliamG. My line was in the new downstream SNR trial and at one point it was at 3 dB, then it came out of the trial and now it's back in it again. What's bizzare is that when the downstream SNR margin was at 6 dB, it became very erratic and jittery. I can't hear any noise on the QLN test, but due to a sudden increase in both G-INP Retransmit Tx's and FEC's, I feel something's not right.

Does anyone have any ideas? I've attached a link to help.

https://i.gyazo.com/037b13819d7ea21563d90b15afd777dd...

Thanks,

William

Edited by WilliamGrimsley (Tue 07-Feb-17 15:25:17)

Standard User j0hn83
(member) Tue 07-Feb-17 16:03:38
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Re: Is A Fault Developing On My Line?


[re: WilliamGrimsley] [link to this post]
 
You've had 26 ES in a week. SNRM is steady. Hlog looks clean.
Remember G-INP Retransmit Tx's and FEC's are errors that corrected before they happen.
I regularly had 10,000 to 50,000 FEC's per minute. It's nothing to worry about.
Your upstream appears quite noisy. You keep having upstream G.INP reapplied, but it's doing it's job well. From roughly 200-250 ES per day on the upstream, G.INP has reduced that to 0.
Your line looks pretty good to me.
Standard User WilliamGrimsley
(member) Tue 07-Feb-17 16:11:05
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Re: Is A Fault Developing On My Line?


[re: j0hn83] [link to this post]
 
Hi John,

Thanks for your reply.

I don't understand how the downstream SNR margin looks steady?! It's far from it comparing it to most other VDSL lines.

Yes, I noticed that the Hlog is clean, hence why I was surprised the downstream SNR margin was going up and down all the time. But, if that's steady then maybe I have nothing to worry about.

Cheers,

William

Edited by WilliamGrimsley (Tue 07-Feb-17 16:13:14)


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Standard User ukhardy07
(knowledge is power) Tue 07-Feb-17 16:48:41
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Re: Is A Fault Developing On My Line?


[re: WilliamGrimsley] [link to this post]
 
The downstream SNR is steady.

A line with issues, known as a flappy line, will have the SNR at 6db and then it suddenly drops drastically to say 1db. This can result in a dropped connection.

Your SNR varies around 1db, it does not drop 3db or 5db at once. Overall the line looks better than mine.

Here is a problematic line:
http://www.abar.co.uk/dsl/snr.png
Standard User WilliamGrimsley
(member) Tue 07-Feb-17 16:51:38
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Re: Is A Fault Developing On My Line?


[re: ukhardy07] [link to this post]
 
Understood, however the downstream SNR margin used to only vary around 0.1 - 0.3 dB, but now it's constantly more, so something must've changed.

Edited by WilliamGrimsley (Tue 07-Feb-17 16:53:59)

Standard User MrDiode
(learned) Tue 07-Feb-17 17:55:26
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Re: Is A Fault Developing On My Line?


[re: WilliamGrimsley] [link to this post]
 
very odd whatever is causing this started on the 3rd of february at 3pm any bt engineers working at your cabinet around that time
Standard User WilliamGrimsley
(member) Tue 07-Feb-17 18:01:36
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Re: Is A Fault Developing On My Line?


[re: MrDiode] [link to this post]
 
I don't know, but it was very windy and several tree branches rub against the line. My line's had issues in the past when it was on ADSL due to this.

Edited by WilliamGrimsley (Tue 07-Feb-17 18:04:02)

Standard User j0hn83
(member) Tue 07-Feb-17 18:13:18
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Re: Is A Fault Developing On My Line?


[re: WilliamGrimsley] [link to this post]
 
I would try leaving the modem off overnight. It's helped with oscillating SNRM with other lines in the past, ones much worse than yours. It's not a huge movement in SNRM and could be caused by a variety of reasons. A buggy modem from a crosstalker could cause this by constantly resyncing. Unlikely to be trees I wouldn't expect it to be so consistent.
Standard User WilliamGrimsley
(member) Tue 07-Feb-17 18:15:35
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Re: Is A Fault Developing On My Line?


[re: j0hn83] [link to this post]
 
That's an idea, but my line's in the downstream SNR margin trial so I can't turn it off. LOL.
Standard User WilliamGrimsley
(member) Wed 08-Feb-17 16:25:55
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Re: Is A Fault Developing On My Line?


[re: WilliamGrimsley] [link to this post]
 
The downstream SNR margin has stopped being very erratic and jittery!

Edited by WilliamGrimsley (Wed 08-Feb-17 16:26:35)

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