VDSL Performance & Tuning

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3700 posts

Uber Geek

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#716281 13-Nov-2012 11:59

0.08 should be fine but you'll want to keep an eye on it if\when you get changed to DLM1 - it might go up a fair bit.

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samsam

167 posts

Master Geek

#716289 13-Nov-2012 12:12

k thanks hopefully I get changed soon, its been 7 days since snap reset the training time. Since then I've gone from DLM7 to DLM4 and about two days ago to DLM2

fellaintga

195 posts

Master Geek

#716846 14-Nov-2012 09:23

Been up 48 days on DLM-1 everything set to Max performance. If you line is reasonable just let it do its thing as they didn't design the system so you had to tweak it every 5 minutes. See where you end up before you start playing you could be worse off listen to SamF.

helis

96 posts

Master Geek

#716885 14-Nov-2012 10:19

fellaintga: Been up 48 days on DLM-1 everything set to Max performance. If you line is reasonable just let it do its thing as they didn't design the system so you had to tweak it every 5 minutes. See where you end up before you start playing you could be worse off listen to SamF.

I don't think some of you are seeing the point. If you leave it on performance over stability you may end up stuck on a higher speed and a higher DLM. If lag is more important than speed than setting stability to max over performance is the way to go. People are not reading this thread because they want to leave everything on default. :)

The 10 day training phase should be based on what you want more. Not just leave it and see. If you want speed leave it on default and by the end of day 10 you will have the highest possible speed for your line. You might end up on DLM1 and you might not. If you want the best possible ping for gaming etc than you can put the odds in your favor by setting the fritz to max stability. At the end of the training phase you can leave it as is any never look back or you can fine tune it to increase the speed.

SamF

1558 posts

Uber Geek

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#717661 15-Nov-2012 13:27

By tweaking the settings during the 10 day period you run the risk of DLM getting an incorrect view of what your line is really like. During those first 10 days there are a lot of background tests & tweaks which are there to get the most out of your line as it is and determine critical thresholds. If you think you know better than the engineers who designed & built the VDSL systems then go right ahead and tweak away, but if not, I'd leave everything at default until the first 10 days are up.

At the end of the day you loose nothing by leaving things on defaults for the first 10 days, once this period is up, you can tweak to your heart's content and DLM will adjust your line accordingly.

helis

96 posts

Master Geek

#717742 15-Nov-2012 14:58

I honestly didn't realise Chorus worked with AVM on setting the Fritz!box defaults.... :|

I'm just giving my opinion based on my experience. Increased SNR will give a better chance of DLM1 and a more stable line. If you want speed increasing SNR is not what you should do. Simple as that.

stevehodge

393 posts

Ultimate Geek

#717794 15-Nov-2012 16:05

helis: I honestly didn't realise Chorus worked with AVM on setting the Fritz!box defaults.... :|

Chorus sets the SNRM target all by themselves. And from what I gather 12db is unusually high. It seems like most implementations use 6 or 9db.

Personally I don't think there is much risk in changing it, though be aware that a lot of resyncs might look like instability to DLM. So if you are going to change it during the initial 10 days, change it once and then leave it alone.

SamF

1558 posts

Uber Geek

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#718974 18-Nov-2012 09:19

WELL!! I plugged in the Snap loan fritz yesterday and this is what I'm getting after running it overnight (all line settings set to 'maximum performance'):

This is what I have been getting for the last month or so with my fritz (all line settings also on 'maximum performance'):

I notice that bitswap is on with the loan fritz too. For some reason it hasn't come on in the last month on mine.

So I'm getting significantly fewer (98%) CRCs with the loan fritz than with my one! Looks like it's definitely faulty!!

I'm going to leave the loan fritz alone until I've got 24hrs uptime to check that I'm getting consistent readings, then push RFI up to maximum and see what the results are then.

SamF

1558 posts

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#719092 18-Nov-2012 17:28

Ok, 24hrs have passed:

CRCPM was sitting at 0.18 until the last large spike of errors, but it's still way better than my old router!:

Now on to RFI tests.

stevehodge

393 posts

Ultimate Geek

#719114 18-Nov-2012 18:43

SamF: I notice that bitswap is on with the loan fritz too. For some reason it hasn't come on in the last month on mine.

So I'm getting significantly fewer (98%) CRCs with the loan fritz than with my one! Looks like it's definitely faulty!!

It's interesting but I don't think you can be sure it is faulty just yet. In my case I had a connection showing 0.3 CRC/min for two or three weeks before a power outage caused a resync. Now my connection is show 2-3 CRC/min. Changing SNRM target between max performance and the middle position hasn't made any difference either way. There are definitely parameters on the line that make a big difference that we can't see in the interface.

Bitswap, incidentally, is controlled by the DSLAM - and I haven't noticed any pattern to its application.

helis

96 posts

Master Geek

#719118 18-Nov-2012 19:09

stevehodge:
SamF: I notice that bitswap is on with the loan fritz too. For some reason it hasn't come on in the last month on mine.

So I'm getting significantly fewer (98%) CRCs with the loan fritz than with my one! Looks like it's definitely faulty!!

It's interesting but I don't think you can be sure it is faulty just yet. In my case I had a connection showing 0.3 CRC/min for two or three weeks before a power outage caused a resync. Now my connection is show 2-3 CRC/min. Changing SNRM target between max performance and the middle position hasn't made any difference either way. There are definitely parameters on the line that make a big difference that we can't see in the interface.

Bitswap, incidentally, is controlled by the DSLAM - and I haven't noticed any pattern to its application.

This is very true. On Thursday I decided to try putting my router back to max performance and my CRCPM has gone from 0 to 0.03. Its been that low for 3 days now. Last time I was on SNR of 12 my CRCPM was closer to 0.1. The only difference is instead of me syncing at 42.5Mbps im only sync'd at 41.4Mbps so could that 1Mbps be the difference between a stable sync and higher CRCPM's?

One thing I have found is if I sync in the morning I get a high rate of speed but that always results in a higher CRCPM where as if I sync in the afternoon/night my speed is about 0.5-1Mbps less but the CRCPM is always lower by about half.

richms

27899 posts

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Lifetime subscriber

#719124 18-Nov-2012 19:24

Speed it set at sync time, so less noise from less people using the internet will give you higher speeds for the same noise margin.

Richard rich.ms

Dairusire

294 posts

Ultimate Geek

#719126 18-Nov-2012 19:25

Well, I'm not complaining about anything, okay maybe a little at the ping but meh. Could be worse. I'm happy downloading at 3.8MBps internationally, and 4MBps on a good day. I was able to download at 4.2MBps but that dropped back with the sync :(

helis

96 posts

Master Geek

#719129 18-Nov-2012 19:33

richms: Speed it set at sync time, so less noise from less people using the internet will give you higher speeds for the same noise margin.

This is what I assumed. But it seems its better to sync at a busy time so that the router picks a speed that suits the worse line condition. This way CRCPM's overall are lower. I generally save doing a reset if i need to until about 7pm.

SamF

1558 posts

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#719135 18-Nov-2012 19:54

I find that even a <1mbit speed change can affect error rates dramatically.

Well, after a few hours with RFI set to 5 I'm getting more errors! Gonna try RFI 3

EDIT: Same deal with RFI 3 & also back on RFI 1!? I dunno, this RFI setting just seems to make things worse for me!

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