VDSL Performance & Tuning

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618 posts

Ultimate Geek

#1280021 9-Apr-2015 21:11

DumKopf: Pretty sad sight. My brothers new Snap! installation.

Figure it's internal wiring, might have to get a technician out.

29dB attenuation? Ouch! That's why the speeds are so low.

I'm not sure the house wiring will be the issue. The standard VDSL install process should include a line filter (installed where the phone line enters the house) and fresh CAT-6 wiring to the RJ-45 jack point. If the existing wiring was used and your brother didn't explicitly say to do this, the installer should come out again and do the job properly. He should be able to arrange this through Snap.

DumKopf

71 posts

Master Geek

#1280023 9-Apr-2015 21:13

The thing is that he didn't have an installer. He went from Xnet ADSL to VDSL2 without someone coming to the property which I thought was pretty weird!

He signed up online, no one called him, just sent out the Fritz!box on the courier. Then his Internet stopped working 2 days later and he rang Snap! to see if they could help, which they did by enabling his account.

I think he's skipped the whole set up process some how.

nzgeek

618 posts

Ultimate Geek

#1280044 9-Apr-2015 21:41

Something certainly does sound wrong here. If he didn't explicitly turn down the in-house wiring, it definitely should have been done. It's possible that the installer is one of the lazy few who takes shortcuts.

It sounds like he needs to call Snap and try to figure out why an installer didn't come to the house. Unless he screwed up somehow, he should be able to get the problem sorted for free.

stevehodge

393 posts

Ultimate Geek

#1280085 9-Apr-2015 23:12

How close is he to the nearest exchange/cabinet? Is he actually in the VDSL area according to Chorus' map (https://www.chorus.co.nz/network-upgrade-map)?

DumKopf

71 posts

Master Geek

#1280086 9-Apr-2015 23:16

That website says:

NETWORK CAPABILITY
Broadband > 20 Mbps (with the right modem and plan)
Broadband > 10 Mbps
NETWORK UPGRADE SCHEDULED
UFB fibre up to 200 Mbps by Dec-2015

Emisune

4 posts

Wannabe Geek

#1280891 11-Apr-2015 09:32

Hello! Just got a new VDSL install done, new house, new wiring. Physically I'm about 100 meters walking distance from the ISLAM. Unfortunately, I'm on Vodafone's Huawei HG659 (the one that says I have 0 attenuation and no interleaving), and the stats from SSH aren't very clear to me although they also say 0 for attenuation values.

It's literally been on less than 24 hours, connection started at 30000 or 34000 down 10000 up and has been switched up to 38500/10000 since then.

Any tips for figuring out attenuation or likely attainable rates with the broken-ass HG659 firmware stats? I've actually got another Huawei VDSL modem here that apparently DOES show the attenuation values (according to posts I've read) but I'm kinda hesitant to reboot/swap modems/anything that might reduce our perceived stability.

I'll include what I can gather in a pastebin since I don't want to wall of text if I can avoid it - http://pastebin.com/bekuXRVt

mentalinc

3238 posts

Uber Geek

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#1280910 11-Apr-2015 10:16

Check after 10 days.
Don't mess with the modem...
Good things take time. I think i started around the 40Mbps before ending up around 54Mbps

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Jase2985

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#1280964 11-Apr-2015 11:26

just leave it and wait the 10 days :)

then see where it is and go from there, you cant really complain at 38mbps though

Lazarus

1 post

Wannabe Geek

#1285725 16-Apr-2015 16:41

@nzgeek

No point waiting for 10 days. The line attenuation is very high unless your place is very far from the cabinet.

I had similar problem and it turned out the Chorus engineer put my ADSL and VDSL on the same cable (I have two connections and two cables from cabinet):

Line attenuation was D25U42 and DSL sync was 3M/5M.

After ADSL and VDSL were separated to two different CAT5 cables:

Line attenuation is D12U20 and sync 40M/10M

This kind of problem is not going to go away on its own.

Jase2985

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#1292091 27-Apr-2015 09:29

Had a power cut here this morning at 6am, but because we have an UPS our connection was still active. so i decided to restart the device to see what i could get sync rate wise.

resynced at 69/10 with a SNR of 2.6. will be interesting to see how long this lasts.

Lorenceo

904 posts

Ultimate Geek

Trusted

#1292211 27-Apr-2015 12:59

How did you get the SNR down to 2.6 on a Broadcom modem? What are the commands? :o

Jase2985

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#1292218 27-Apr-2015 13:10

Lorenceo: How did you get the SNR down to 2.6 on a Broadcom modem? What are the commands? :o

i didnt thats what it resynced at in the middle of a power outage, everyone else's modem would have been off but i have an UPS :)

hio77

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Lizard Networks

#1292254 27-Apr-2015 14:45

i forget jase, is that a 8B or 17A line?

#include <std_disclaimer>

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

Jase2985

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#1292387 27-Apr-2015 18:39

modem says 17a, it was 17a at 49/10 as well.

the technicolour doesnt tell you the profile, but im now using a netcomm, its also showing the attenuation as being 2.3dB higher than the technicolour.

there was zero difference in sync speeds when i changed modems.

hio77

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Lizard Networks

#1292388 27-Apr-2015 18:41

Jase2985: modem says 17a, it was 17a at 49/10 as well.

the technicolour doesnt tell you the profile, but im now using a netcomm, its also showing the attenuation as being 2.3dB higher than the technicolour.

there was zero difference in sync speeds when i changed modems.

Likely the two modems just read the attenuation differently or theres a bug in it.

for a line with a fair bit of cross talk, not bad 17a sync :)

#include <std_disclaimer>

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

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