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Author Topic: Drop to below SNRM target this morning  (Read 484 times)

Weaver

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Drop to below SNRM target this morning
« on: April 19, 2021, 02:45:18 PM »

My line 1 is set to 6 dB downstream target SNRM and 9db upstream, supposedly. This morning, for god only knows what reason, the line dropped at around 9:25 am and resynched with a d/s SNRM of 3dB which was wrong. I have no idea why it resynched and I have no idea why it was at 3dB, not the 6dB that is on record in clueless.aa.net.uk

This then caused me a load of problems with Zoom as the error rate was too high.

Iíve just forced an SNR reset, and the SNRM is now 6.5 dB d/s / 9.0 dB u/s, just as it should be.
« Last Edit: April 19, 2021, 02:54:13 PM by Weaver »
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burakkucat

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Re: Drop to below SNRM target this morning
« Reply #1 on: April 19, 2021, 04:36:58 PM »

Just one of those little mysteries with no obvious reason.
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Weaver

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Re: Drop to below SNRM target this morning
« Reply #2 on: April 19, 2021, 06:37:37 PM »

I looked at this further and all lines had ended up at 3dB d/s at some earlier time. I would have to go back through all the logs to work out when the SNRM changed for each line. Line 2 anyway did not change this morning, it was at least a few days earlier than this; I didnít go back far enough to find it.
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burakkucat

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Re: Drop to below SNRM target this morning
« Reply #3 on: April 19, 2021, 10:56:28 PM »

A while ago, you were running each circuit with a DS target SNRM of 3 dB. Could it be that one of your auto-magic scripts made the change? (Perhaps you forgot to disable the helper.)  :-\
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Weaver

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Re: Drop to below SNRM target this morning
« Reply #4 on: April 21, 2021, 12:04:24 AM »

No, I havenít developed that technology yet. Good thought though. There are two things here; why drop a line? Could be various reasons but Iím thinking that it is unreasonable, and secondly why forget what the downstream target SNRM is?

I decided a few weeks ago that I had to raise the downstream target SNRM to 6dB from the long-term 3dB because of unreliable performance with Zoom.
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burakkucat

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Re: Drop to below SNRM target this morning
« Reply #5 on: April 21, 2021, 12:10:45 AM »

xDSL technology is both:
  • miraculous
  • mysterious
At times it is impossible to rationalise what has taken place. I strongly suspect that this is one of those times.
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Weaver

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Re: Drop to below SNRM target this morning
« Reply #6 on: April 21, 2021, 07:21:57 AM »

At least I can fix it with an SNR reset. But I donít want it to happen again as it causes too many errors.

This is what we want to see (for the first time ever); the report from my DSL linksí summary tool:

Summary of DSL linksí wellbeing and error counts
=====================================

--------------------------------------------------------
 ***                                                                                    ***
 *** All is well ! No errors or problems detected.  : -)  ***
 ***                                                                                    ***
--------------------------------------------------------

--
* Modems with a few errors:  None

__
« Last Edit: April 21, 2021, 07:26:20 AM by Weaver »
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Weaver

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Re: Drop to below SNRM target this morning
« Reply #7 on: April 25, 2021, 12:53:36 PM »

This has happened twice more. Always in the early morning. The latest was line 1 only and at 6am, and that time that is an exact multiple if an hour makes me thing that it is related to management systems - something within BT or AA. Iím wondering now if this is the resync to do with the 10 day training period. this latest time it put the downstream SNRM of line 1 down from the target 6 dB to 3, but left the upstream alone at my chosen elevated 9 dB target.

Iíll have to ask AA. Itís not like it is a major problem, just a bit odd.
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ejs

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Re: Drop to below SNRM target this morning
« Reply #8 on: April 25, 2021, 01:14:20 PM »

Perhaps it's the DLM doing it's thing. Doing a reset to set the target SNRM to whatever value does not disable the DLM, and does not prevent the DLM from changing the target SNRM.
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Weaver

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Re: Drop to below SNRM target this morning
« Reply #9 on: April 26, 2021, 02:55:06 AM »

Yes, I had thought about DLM. Itís weird DM increasing the error rate though isnít it? By reduce the SNRM? Iím lost. If so, I could get AA to fix that by turning off the DLM, iirc.
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