VDSL Performance & Tuning

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#927750 5-Nov-2013 17:04

Your error rates look fine, the telecom modem seems to do overall rates rather than per min like we talk about here.

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hio77

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#929211 8-Nov-2013 03:17

so, after the whole substation explosion.. heres what my lines looking like..

so, i synced at a SNR of 10db.. and this has been constant, rather than jittering like normal.. still running DLM-2 with rather undelightful FECs (suspect they are keeping me from dropping down - have been doing reboots every 3~6 days to try to encourage some sort of movement in DLM)

worth noting, my connection wasn't turned straight on after the power came back on, so its not just the sync in before the crosstalk sort experience..

been humming and harring about getting onto snap, since chorus "reset DLM" but clearly watching the stats, resyncs and such they didnt do jack, with exams haven't really had the time to fuss with chorus..

but i do wonder.. this 10db SNR, isnt that seeming to be a sign that seems to crop up in 17a testing?

clearly my slight speed increase here is the synced 10db SNR working its magic, so no questioning that one..

interesting to see a bit more erroring on the upstream than normal too..

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stevehodge

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#929301 8-Nov-2013 11:02

hio77:
but i do wonder.. this 10db SNR, isnt that seeming to be a sign that seems to crop up in 17a testing?

I had some weird syncs before going onto 17a but I'm not convinced they were related.

hio77

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#929302 8-Nov-2013 11:03

stevehodge:
hio77:
but i do wonder.. this 10db SNR, isnt that seeming to be a sign that seems to crop up in 17a testing?

I had some weird syncs before going onto 17a but I'm not convinced they were related.

maybe im just too hopeful then!

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Paul1977

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#929359 8-Nov-2013 12:41

hio77:but i do wonder.. this 10db SNR, isnt that seeming to be a sign that seems to crop up in 17a testing?

If that's the case they must be testing the crap out of mine - jumping between 8 and 9 now. I'm really not sure what to make of it, over a week since last resync and the SNR seems to be getting progressively lower.

hio77

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#929392 8-Nov-2013 13:25

Remember the graph shows minimum.

If the 8db mark is correct your borderline for 17a.

I have had lows as far as 1db recently ...no surprise errors were a tad high in that period.

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graemeh

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#929425 8-Nov-2013 13:58

Could I please have feedback on the stats shown below.

I am particularly concerned about the high "remediable errors (FEC)" numbers.

Should I be worried? If I should worry then what should I do to attempt to reduce them.

Modem Stats

Samsung

Shop now on Samsung phones, tablets, TVs and more (affiliate link).

Paul1977

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#929483 8-Nov-2013 14:58

graemeh: Could I please have feedback on the stats shown below.

I am particularly concerned about the high "remediable errors (FEC)" numbers.

Should I be worried? If I should worry then what should I do to attempt to reduce them

Have you got a master splitter/filter installed?

I'd ask Snap to perform a 24-hour extended line test and analyze the results for you. Your way up on DLM-7, so I'd say there is a problem with your line. But I'm no expert.

graemeh

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#929503 8-Nov-2013 15:10

Paul1977:
graemeh: Could I please have feedback on the stats shown below.

I am particularly concerned about the high "remediable errors (FEC)" numbers.

Should I be worried? If I should worry then what should I do to attempt to reduce them

Have you got a master splitter/filter installed?

I'd ask Snap to perform a 24-hour extended line test and analyze the results for you. Your way up on DLM-7, so I'd say there is a problem with your line. But I'm no expert.

Thanks for the suggestion. I do have a master splitter/filter installed.

I think I'll start by checking the connections to/from the splitter this weekend and see if that does anything.

Chorus have done a 24 hour monitoring exercise and said it is fine but commented on the high level of errors. They were monitoring because we have had problems with disconnects which they thought were being caused by the modem (they were apparently PPP disconnects). The disconnect problem seems to have settled down now but the high error level remains.

hio77

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#929542 8-Nov-2013 15:54

Because your retiree seconds are low, you will have a hard time getting any response from chorus.

It's the same situation I'm dealing with currently.

Chorus reconside the errors are high, will say dlm is doing its job.

Hopefully the 16ms profile will be a arguable point for you however.

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SamF

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#929646 8-Nov-2013 18:10

Well, I declare my attempt to get onto 17a with an 8db line officially over & a bust. I have been running this config (-1db SNRM tweak) for 63 days, 49 of which were one continuous connect session (14 days for the other). Here are my final stats:

So if that won't get me on 17a, I don't think anything will! I'm going back to my fully tweaked setup now :)

hio77

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#929697 8-Nov-2013 20:21

thats quite a shame :/ im still hopeful ill fall over the 17a mark.. think being too hopeful for it might be pushing it however..

does bring up the question still though, what exactly the case is for 17a.. if only we knew..

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SamF

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#929704 8-Nov-2013 20:34

Pretty sure the attenuation threshold is 7db. Not sure if there are any error thresholds or not.

hio77

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#929706 8-Nov-2013 20:37

SamF: Pretty sure the attenuation threshold is 7db. Not sure if there are any error thresholds or not.

see, thats what we have understood.. but the posting on the chrous site, infers more around a 4db mark due to it saying 200M IIRC..

then theres the question, why if its clean cut down to distance from the cabinet, why is it not done at previsioning, why does it take so long to actually happen...

im just poking holes at it now though..

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mikenzb

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#929711 8-Nov-2013 20:44

stevehodge:
hio77:
but i do wonder.. this 10db SNR, isnt that seeming to be a sign that seems to crop up in 17a testing?

I had some weird syncs before going onto 17a but I'm not convinced they were related.

You on a Whisper Cabinet?
If yes Single or Double Bays?

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