VDSL Performance & Tuning

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41 posts

Geek

Reply # 735303 20-Dec-2012 09:49
I got my VDSL connected on Monday, it initially had a low sync rate of around 25000 but I knew the wiring was a mess. I was going to get Coffeebaron out to check it all but with it being Xmas and money being tight at this time of year I decided to get into the roof and run a cable myself..... Well after much swearing and sweating I ended up coming back online with a 35000 sync rate and a very low error rate. As of last night I received a new DLM profile and it looks like I've actually gone backwards to DLM-3 from DLM-6 and the errors have gone through the roof, slightly disappointing considering the much better line that it is now running on.... I asked snap to reset the DLM with all the mucking around with the wiring but they can't do it until after the initial 7-10 days and then only if there are still issues. So guess I will just have to be patient and hope things start going the correct way!

SamF

815 posts

Ultimate Geek

Trusted

Reply # 735537 20-Dec-2012 14:31
Hmm, I think there are still issues on your line; possibly outside your house now...

Jekkyl

41 posts

Geek

Reply # 735652 20-Dec-2012 17:16
Possibly, it's also possible something is not quite right with the cable I ran. Unfortunately can't really get anything done until the DLM does it's initial thing. There were hardly any errors last night until the DLM change.

stevehodge

146 posts

Master Geek

Reply # 735673 20-Dec-2012 18:15
Jekkyl: Possibly, it's also possible something is not quite right with the cable I ran. Unfortunately can't really get anything done until the DLM does it's initial thing. There were hardly any errors last night until the DLM change. Can you post the spectrum and statistics tabs?

Jekkyl

41 posts

Geek

Reply # 735753 20-Dec-2012 21:49
yup

stevehodge

146 posts

Master Geek

Reply # 735781 20-Dec-2012 22:42
Nothing obviously wrong with the spectrum. Errors are pretty high but we already knew that.

gmanp

34 posts

Geek

Reply # 735844 21-Dec-2012 08:22
Another resync this morning (4:11am) and... Good news: DLM1! Bad news: Look at those errors! I don't think I'll be staying here long.

sbiddle

16690 posts

Uber Geek

Moderator

Trusted

Biddle Corp

Subscriber

Reply # 735862 21-Dec-2012 09:03
HowickDota: I'm about 120m from the cabinet on the same side of the street. I don't have a master filter but I won't be using the phone line when I switch to vdsl. The mere fact you have POTS off makes no difference at all. If you have multiple jackpoints you need a master filter, no if's or buts. If you don't VDSL2 performance will be degraded. *Need help configuring your Linksys ATA or IP Phones for New Zealand? Check my blog post

SamF

815 posts

Ultimate Geek

Trusted

Reply # 735911 21-Dec-2012 10:26
@gmanp: Recent evidence indicates that Chorus have increased the acceptable error limit required to stay on DLM-1, but we're not sure what this new limit is yet. So all is not lost! :) Keep us posted with how you go!

sidefx

1052 posts

Uber Geek

Reply # 735915 21-Dec-2012 10:30
SamF: @gmanp: Recent evidence indicates that Chorus have increased the acceptable error limit required to stay on DLM-1, but we're not sure what this new limit is yet. So all is not lost! :) Keep us posted with how you go! Yeah, might be alright at 6 CRCPM, let us know how it goes, I'd be very interested to see if it is acceptable as if it is I'll bump target SNRM down even more. ;-) I've now been on CRCPM > 1 (but less than 2 - or maybe less than 1.5, it seems the fritzbox might round to the nearest integer when errors are over 1?) for a good while with no DLM downgrade yet.

helis

84 posts

Master Geek

Reply # 735935 21-Dec-2012 10:58
sbiddle: HowickDota: I'm about 120m from the cabinet on the same side of the street. I don't have a master filter but I won't be using the phone line when I switch to vdsl. The mere fact you have POTS off makes no difference at all. If you have multiple jackpoints you need a master filter, no if's or buts. If you don't VDSL2 performance will be degraded. Unless you live close to the exchange :) I have multiple jack points and no master filter. I still sync at 42Mbps with 0.7 CRCpm. That being said once I run a straight cat5e cable I could see close to max sync rate hopefully when I actually get round to do that.

Jekkyl

41 posts

Geek

Reply # 735937 21-Dec-2012 11:10
So I had 2 resyncs last night about an hour apart. DLM looks the same but error rate has dropped right down on CRC but FEC is up quite a bit..so not really sure what is going on

RunningMan

1324 posts

Uber Geek

Reply # 735960 21-Dec-2012 11:30
helis: sbiddle: HowickDota: I'm about 120m from the cabinet on the same side of the street. I don't have a master filter but I won't be using the phone line when I switch to vdsl. The mere fact you have POTS off makes no difference at all. If you have multiple jackpoints you need a master filter, no if's or buts. If you don't VDSL2 performance will be degraded. Unless you live close to the exchange :) I have multiple jack points and no master filter. I still sync at 42Mbps with 0.7 CRCpm. That being said once I run a straight cat5e cable I could see close to max sync rate hopefully when I actually get round to do that. So you expect to see an improvement when you run your new cable? That suggests it is being degraded.

helis

84 posts

Master Geek

Reply # 735974 21-Dec-2012 11:47
RunningMan: helis: sbiddle: HowickDota: I'm about 120m from the cabinet on the same side of the street. I don't have a master filter but I won't be using the phone line when I switch to vdsl. The mere fact you have POTS off makes no difference at all. If you have multiple jackpoints you need a master filter, no if's or buts. If you don't VDSL2 performance will be degraded. Unless you live close to the exchange :) I have multiple jack points and no master filter. I still sync at 42Mbps with 0.7 CRCpm. That being said once I run a straight cat5e cable I could see close to max sync rate hopefully when I actually get round to do that. So you expect to see an improvement when you run your new cable? That suggests it is being degraded. Yeah my point was just that it although my connection will be degraded its not going to make that much of a difference as my line is perfectly fine as it is for speed and errors. If I could I'd happily run a new cable the 200m's back to the cabinet :)

stevehodge

146 posts

Master Geek

Reply # 736144 21-Dec-2012 19:11
sbiddle: If you have multiple jackpoints you need a master filter, no if's or buts. If you don't VDSL2 performance will be degraded. That might be a good rule-of-thumb, but it was not my experience. When I first got VDSL the modem was pluged into the second of two jackpoints connected with standard unshielded, untwisted cable. I replaced that with a cat6 star layout (with a patch panel so there is a single, direct cat6 path between the ETP and the modem) and I have seen no improvement in either sync rate or error rate.

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