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Erratic U/S SNRM and resulting DLM interventions

FIXED
jab1
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Registered: ‎24-02-2012

Re: Erratic U/S SNRM and resulting DLM interventions

Since the change of router, but unfortunately with no calls to see if they cause problems, here are my RSL plots to date. I have removed a few where the trace is steady. First 6:

NoiseMargin-2019Feb09-1042.jpgNoiseMargin-2019Feb09-1430.jpgNoiseMargin-2019Feb09-1730.jpgNoiseMargin-2019Feb10-0230.jpgNoiseMargin-2019Feb10-0530.jpgNoiseMargin-2019Feb10-1430.jpg

John
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

2nd six:

NoiseMargin-2019Feb10-1443.jpgNoiseMargin-2019Feb10-1743.jpgNoiseMargin-2019Feb10-2042.jpgNoiseMargin-2019Feb10-2342.jpgNoiseMargin-2019Feb11-0243.jpgNoiseMargin-2019Feb11-0543.jpg

Notice the instability, especially on the u/s trace from around 1710 Sunday, and the drops to below 0.

John
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

As a point of interest, although it can occasionally give duff readings, here is my JDAST log:-

JDAST.PNG

John
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

Results of an incoming call this morning. Lost connection, but it came back OK with no change in d/s noise margin, but an increase in the u/s plot. NOTE: there was no noise on the line during the change, whereas previously this had caused a burst of crackling.

RSL.PNG

John
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

RSL plot missing from last post, and afurther one following a later incoming callNoiseMargin-2019Feb11-1143.jpg1329.PNG

John
Plusnet Help Team
Plusnet Help Team
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Re: Erratic U/S SNRM and resulting DLM interventions

Hi @jab1,

 

Thank you for letting us know that you've received the new the new router and for sending over the graphs to illustrate how your connection is looking from your side at the moment. For reference, here's a copy of your RADIUS log and today's GEA test result:

xDSL Status Check
Circuit ID: CBUKXXXXXXXXX Service ID: BBEUXXXXXXXXX
Telephone NO.: NA Test Executed On: 11-02-2019 15:24:49
xDSL Status Test Summary
Sync Status: Circuit In Sync
General Information
NTE Status:   NTE Power Status: Unknown Bypass Status:  
 
  Upstream DSL Link Information Downstream DSL Link Information
Loop Loss: 16.0 32.5
SNR Margin: 6.9 6.3
Errored Seconds: 0 1
HEC Errors: 0  
Cell Count: 709 1091
Speed: 780 12116
 
Maximum Stable Rate (KBPS): 11360 Fault Threshold Rate (KBPS): 9088
Mean Time Between Retrains (Seconds): 21548 Mean Time Between Errors Upstream (Seconds): 2873
Indicative Line Quality: A Mean Time Between Errors Downstream (Seconds): 361
Custom Thresholds
MTBR_RED: MTBE_RED:
MTBR_GREEN: MTBE_GREEN:

 

As our tests aren't picking up the cause of the issue from here, we'll need to raise this to our suppliers and potentially book an engineer visit so that this can be investigated further. Please report the issue here and let us know when you've completed it.

If this post resolved your issue please click the 'This fixed my problem' button
 Emily D
 Plusnet Help Team
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

@EmilyD Thanks for the RADIUS log & GEA test. Sad to report that after a promising 36 hours, at 1840 tonight, DLM kicked in again, and raised the d/s SNR to 14dB, dropping my connection speed to 7959Kbps Sad

 

I'm away from home tomorrow and a bit busy tonight so will raise a BB fault on Wednesday.

John
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

@Gandalf, @RandallFlagg, @Gandalf.

Having done everything possible from my side, but still not resolved the issue, I have just tried to raise a BB fault, answered all the questions asked - truthfully - and your troubleshooter decided everything was OK, so auto-closed the ticket.Knuppel

Any ideas what I need to do now? My connection has gone back to being erratic, and the last but one DLM change resulted in a d/s SNR of 3 - totally useless!

Current situation is a d/s SNR of 13.5dB, u/s SNR of 6.3dB and a connection speed of 9.063Mb/s

John
Plusnet Help Team
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Re: Erratic U/S SNRM and resulting DLM interventions

Hi @jab1 

 

The pains of being truthful hey? 

 

Any ideas which question made the troubleshooter decide that? 

 

I can certainly see that there is something not quite right...

 

Can you possibly please try it once more for us and let us know if it works this time? 

 

Thanks, 

 

MoR

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 MoR
 Plusnet Help Team
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

@MasterOfReality I can't say which of my truthful answers gave rise to that obviously wrong answer, but all I can say is that at no point did i say everything was fixed, but I think I got to the end of the troubleshooter.

I'll have another go sometime tomorrow, and take careful note of the last question I am asked.

FWIW, I still think the problem  is in the BT/OR network, as DLM keeps on insisting on setting an unsustainable 3dB d/s margin, even though I am supposedly on a custom set 6dB minimum.

John
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jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

@MasterOfReality Changed an answer, can't remember which, and a fault has been raised. As everything my side of the master socket has been changed, I am convinced the problem is BT's side.

As a point of interest, your line test has resulted in my connection speed rising to 13365Kbps, and the d/s SNR falling to 3.3dB which I know will result in another re-sync sometime today, as my line is too long for such a low margin, as I have been advised previously by BT engineers.

I thought the minimum had been custom set to 6dB?Huh

John
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

As a picture paints a thousand words (as they say), just thought I'd post my RSL plots from today:

NoiseMargin-2019Feb14-1023.jpgNoiseMargin-2019Feb14-1323.jpgRSL2.PNG

John
Plusnet Help Team
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Re: Erratic U/S SNRM and resulting DLM interventions

Hi @jab1, thanks for your post.

 

I've run line diagnostics and we are showing that you're currently set to 6dB.

 

I'm slightly concerned that on checking our connection logs I'm now not seeing an ongoing connection, with it cutting out at around 13:08 this afternoon.

 

Can you confirm what you're seeing your end?

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 Owen P
 Plusnet Help Team
jab1
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Re: Erratic U/S SNRM and resulting DLM interventions

@OskarPapa - yup, it did exactly that at 13.08, and again at 13.49 - see the RSL plots in the post above yours.

As you can see from those, I had a definite 3.3dB margin at that point, then it shot up to around 14.8dB, and down to around 6dB after the re-sync at 13.49.

NONE of this is anything changing at my location - it is all down to the DLM actions.

John
Plusnet Help Team
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Registered: ‎26-03-2018

Re: Erratic U/S SNRM and resulting DLM interventions

Hi @jab1,

 

Thank you for confirming that the SNR margin is changing frequently on your side. As this is the case, I think that it would be worth progressing this as a fault and potentially arranging an engineer visit so that this can be investigated further.

 

Please report the issue here and let us know when you've completed it.

If this post resolved your issue please click the 'This fixed my problem' button
 Emily D
 Plusnet Help Team