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Author Topic: Odd shaped SNR-vs-tone graph - line #4 fault again  (Read 21667 times)

burakkucat

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #135 on: November 26, 2020, 07:46:12 PM »

Hmm . . . How about sending andrew-AAISP a PM and ask him to review this thread?  :-\
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #136 on: November 26, 2020, 09:43:04 PM »

I’m pretty sure a senior colleague has looked into this. I’ve emailed AA with a report, and an earlier email had all the graphs, and another had also a url pointing to Johnson’s github sources and binaries
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burakkucat

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #137 on: November 26, 2020, 10:17:52 PM »

Ah, I see. So let's strike out my suggestion.
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #138 on: November 26, 2020, 10:33:23 PM »

No, I’m not ignoring your suggestion, my friend.  :) In fact I think I still have Andrew’s email address.
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burakkucat

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #139 on: November 26, 2020, 10:39:04 PM »

In fact I think I still have Andrew’s email address.

If you were to left-click (yes, I realise an iDevice is different) upon the "andrew-AAISP" link you should see options for sending a PM and (possibly) also for sending an E-mail message.  ;)
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #140 on: November 28, 2020, 10:47:34 AM »

 :drink: :yay: Problem solved, once again, on second engineer visit.

Very knowledgeable and helpful engineer from Gleann Dàil (I think he said) arrived this morning and magically fixed the problem! But once again, we don’t know how: downstream sync rate was around 1Mbps (at I forget what SNRM) but DLM pushing the SNRM up may be part of the issue if I had not reset it recently.

Our engineer told Janet and me that FTTP is being provided in Skye now: in Dùn Tuilm and Bhatairnis at the extreme northern end of the Island and also on the mainland, in Gleann Seile, and he mentioned some thing about supply to 120 houses but I’m unsure where that is to be as my hearing is not good. It almost sounds as if sanity has broken out and the powers that be are doing those with the greatest need?

That has to be some of the best news in ages and he said it will certainly be coming to Heasta. He mentioned pole-mounted distribution nodes, I don’t know if that is instead of FTTP green cabs.
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #141 on: November 28, 2020, 11:04:02 AM »

Sync rates:
  #1: down 3015 kbps, up 522 kbps
  #2: down 2986 kbps, up 566 kbps
  #3: down 2935 kbps, up 389 kbps
  #4: down 3139 kbps, up 570 kbps

Look at line #4 go! This is a recurring pattern; when the faults get mysteriously fixed, the speed is very high downstream.
« Last Edit: November 28, 2020, 11:13:43 AM by Weaver »
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burakkucat

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #142 on: November 28, 2020, 04:35:21 PM »

Sync rates:
  #1: down 3015 kbps, up 522 kbps
  #2: down 2986 kbps, up 566 kbps
  #3: down 2935 kbps, up 389 kbps
  #4: down 3139 kbps, up 570 kbps

Look at line #4 go! This is a recurring pattern; when the faults get mysteriously fixed, the speed is very high downstream.

An excellent result. Let's hope it lasts.  :fingers:
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neil

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #143 on: November 28, 2020, 06:57:46 PM »

Sync rates:
  #1: down 3015 kbps, up 522 kbps
  #2: down 2986 kbps, up 566 kbps
  #3: down 2935 kbps, up 389 kbps
  #4: down 3139 kbps, up 570 kbps

Look at line #4 go! This is a recurring pattern; when the faults get mysteriously fixed, the speed is very high downstream.
wow  :o
looks like you are far way from your cabinet?
and you are using adsl
can you please tell me what software you are using for telnet?
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #144 on: November 28, 2020, 10:03:45 PM »

Hi neil, line 2 is on a cabinet but the other three are exchange-only (EO) ie direct into the exchange. The lines are 7300m long roughly - 4.5 miles.

To telnet into my modems I’m using the Prompt2 app on an iPad.
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #145 on: November 30, 2020, 08:46:09 AM »

I told my engineer about the weird mystery of how no-one knows what it is that is fixing my lines. He said he had seen the 3+ Mbps downstream sync rate when he first came on site, that is, he had not seen the low 1 Mbps reading.
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #146 on: December 08, 2020, 10:22:25 AM »

Fault on line 2 was reported to AA, they came back and told me immediately that they could see a battery contact fault. I could have checked for that myself but I didn’t think any more to it other than burned faceplate front or modem cable as seen with line 4. See https://forum.kitz.co.uk/index.php/topic,25430.0.html This morning an engineer rang at 8 am; he was at the exchange or out on the moor locating the fault. Speed is already up to 2.9 Mbps, should be 3.1 Mbps and can see that the SNR vs tones curve is still not quite perfect but 93% of the way there. The bit-loading graph shows that it is 2 bits short of what it should be on the best downstream tones, should be 12 bits in places, otherwise 11 bits from tones 40 to 80, but in part of that region it isn’t yet even managing ten.

Anyway, a good job so far. Engineer still out there working on it. Really really nice guy; hellish job having to be up before 8am, ugh. Poor fellow, what a hero.



Erm, not such a good end to the tale: having been working, the line is now down!  >:( ???

Notes follow:

2020-12-08 11:11:24      Track PSTN Fault 5-8-183338846151 Informational Message: 4150 Response Required - Fault Report Cleared   bt
2020-12-08 11:11:24      Track PSTN Fault 5-8-183338846151 Estimated Response Time: 2020-12-08T23:59:59   bt
2020-12-08 11:11:24      Track PSTN Fault 5-8-183338846151 Clear: 82.2 In Joint AreaCable (Underground)   bt
2020-12-08 11:11:24      Track PSTN Fault 5-8-183338846151 Status: Open - Clear Unconfirmed

Track PSTN Fault 5-8-183338846151 Notes Field: **Line Stability:**Network Stability:**Test Outcome:Pass**MFL:OK**Term Statement:**Line Signature:**Distance to Fault:0**Cable length:8.16**Test Start Time:2020-12-08T11:11:08**Test Stop Time:2020-12-08T11:11:09
=== QBC Summary Start ===
Customer Report: End customer advised there is a broadband issue.
Actions to resolve: Engineer has resolved the fault located at the D-side including aerial cables / lead-in / block terminal.There was a fault outside the end customer's curtilage caused by general wear and tear.The fault was fixed by clearing in joint.The test passed on 2020-12-08T10:40:52.
Final alternate test results: Final FastTest performed from the customer premise. The test passed on 08/12/2020 11:01:28.=== QBC Summary End ===



The bit about "Final alternate test results: Final FastTest performed from the customer premise." is a complete lie as he never came to the house, or I would have been able to say, where’s my DSL gone?

Very nice guy though, very friendly, just a bit daft.
« Last Edit: December 08, 2020, 02:14:34 PM by Weaver »
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #147 on: December 08, 2020, 02:17:53 PM »

Have notified AA that I now no longer have any DSL.
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burakkucat

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #148 on: December 08, 2020, 06:43:01 PM »

 :(
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Weaver

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Re: Odd shaped SNR-vs-tone graph - line #4 fault again
« Reply #149 on: December 08, 2020, 11:24:20 PM »

AA just asked me to do a quick sanity test with a swap of modems, they said so "then I can confidently moan at them" [Openreach].
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