VDSL Performance & Tuning

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133 posts

Master Geek

#721122 22-Nov-2012 09:13

Well survived another night on DLM1... That means I've been sitting on DLM1 for at least 60 hours on this sync and possibly up to 71 hours back to when I was upgraded.

My stats are pretty steady and I have avoided causing any resyncs myself. I wonder if that's why DLM is happy leaving me on DLM1 for the moment...?

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mattgreen

133 posts

Master Geek

#721906 23-Nov-2012 15:28

Well no resync last night either... Perhaps DLM is happy leaving me on DLM1 because my SNRM is a steady 11-12db and I'm not forcing resyncs myself.

Looking at the graphs I seem to be overing anywhere between 40-70 CRC errors every hour so an average of 0.66-1.16 CRCPM.

stevehodge

393 posts

Ultimate Geek

#721990 23-Nov-2012 18:23

mattgreen: Well no resync last night either... Perhaps DLM is happy leaving me on DLM1 because my SNRM is a steady 11-12db and I'm not forcing resyncs myself.

Yeah, I'd leave it alone too. I think DLM sometimes pre-selects a new profile but doesn't force a resync, I'd be interested to know if you change profile next time you do resync for whatever reason. Otherwise hopefully you'll be on DLM-1 for a least a month.

SamF

1558 posts

Uber Geek

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#722041 23-Nov-2012 21:10

You won't stay on DLM-1 permanently with that CRC rate tho, we have historical evidence to prove that!

richms

27878 posts

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Lifetime subscriber

#722043 23-Nov-2012 21:19

Im still on it from with these stats.

Richard rich.ms

SamF

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#722045 23-Nov-2012 21:22

Oh true!?? Ok, I take that back! However, we have seen others on 1 CRCPM who don't stay on DLM-1, so it's not guaranteed!

Then again, your sync rate is very low for VDSL so maybe there's some correlation with that?

EDIT: Interesting error pattern!

McGee

200 posts

Master Geek

#722460 24-Nov-2012 23:00

Check out these errors boys and girls :)

2x Fritz boxes tested, Pair change already preformed as the previous one had 32v coming down one leg.
Only thing left is ISAM port change I suppose.
Distance is 500m from cabinet, Custom service lead run from street.

Happy days!

helis

96 posts

Master Geek

#722462 24-Nov-2012 23:13

McGee: Check out these errors boys and girls :)

2x Fritz boxes tested, Pair change already preformed as the previous one had 32v coming down one leg.
Only thing left is ISAM port change I suppose.
Distance is 500m from cabinet, Custom service lead run from street.

Happy days!

And you are still on DLM1 lol go figure.

A Line attenuation of 15 seems to be a lot for only 500m. Have you tried connecting the router directly into the demarc to remove the internal wiring of your house as the problem.

mattgreen

133 posts

Master Geek

#724633 29-Nov-2012 13:04

Still haven't had a re-sync from the day I was upgraded. Still the same stats... Still on DLM1...

So either DLM isn't particularly active on my line or it just doesn't care about a CRCPM of 1 when SNRM is a steady 12.

Meanwhile I dare not reboot the router haha.

stevehodge

393 posts

Ultimate Geek

#724766 29-Nov-2012 17:18

mattgreen: Still haven't had a re-sync from the day I was upgraded. Still the same stats... Still on DLM1...

So either DLM isn't particularly active on my line or it just doesn't care about a CRCPM of 1 when SNRM is a steady 12.

Meanwhile I dare not reboot the router haha.

Interesting. I was expecting a resync around now but it hasn't happened yet. My errors also pretty bad:

But the line has been up 26 days now and I haven't had a DLM resync since the 28th of Sept.

SamF

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#724806 29-Nov-2012 18:16

Interesting! Maybe they've tweaked the allowable error rate for DLM1?

SamF

1558 posts

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#725905 2-Dec-2012 23:06

Well... I got swapped to DLM-1 last this morning. My CRCPM rate was 12 however :/ I've upped the SNRM to 16 and my CRCPM is now ~1, but of course I've lost quite a bit of speed:

Going on previous results I'd be expecting to drop from DLM-1 pretty soon, but based on what's been seen in the last 2 weeks with DLM stable even at 42 CRCPM, I'm not so sure now! I think there is a possibility that Telecom have tweaked the maximum error rate for DLM-1! Maybe they were playing it cautious to start with and now they're trying out less strict error limits?

I might see if I can get my router swapped out in any case, because the loan fritz did considerably better with the error rate than my current one!

How's everyone else on DLM-1 and high error rates going since last week?

stevehodge

393 posts

Ultimate Geek

#725910 2-Dec-2012 23:26

SamF: I think there is a possibility that Telecom have tweaked the maximum error rate for DLM-1! Maybe they were playing it cautious to start with and now they're trying out less strict error limits?

Possibly. Or maybe other factors were causing the downgrades before. I was on DLM-1 for all of August with about 3 CRC/min.

How's everyone else on DLM-1 and high error rates going since last week?

Still on DLM-1 with about 2 CRC/min. If it stays like this for another week I'm going to put intended SNRM back to max performance (I've got it down on the middle notch at the moment).

SamF

1558 posts

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#725914 2-Dec-2012 23:57

stevehodge:I was on DLM-1 for all of August with about 3 CRC/min.

Yeah, but your line always seems to act differently to everyone elses!

stevehodge

393 posts

Ultimate Geek

#725916 3-Dec-2012 01:08

SamF:
stevehodge:I was on DLM-1 for all of August with about 3 CRC/min.

Yeah, but your line always seems to act differently to everyone elses!

I suspect people with my sort of line behaviour just don't report it here. There are certainly a number of people who posted once about going on to DLM-1 but haven't posted since. Perhaps they all have perfect error rates, but I suspect that's unlikely given the variation we've seen on our own lines.

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