VDSL Performance & Tuning

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90 posts

Master Geek

#1664882 7-Nov-2016 11:15

This is a bit of a first world problem, but are there any reasons a DSLAM wouldn't use a 9dB SNR ? Recently noticed that I've consistently got a 12dB connection from a Vigor 130 over the last year, and now the same from a Fritzbox 7490 (set to max performance). Are either of devices known for mis-reporting the SNR ? Do some DSLAMs or ports still use 12dB ?

The history of this connection is 41/10Mbps @ 12dB on 997, improving to 65/11Mbps @ 9dB when 998 started in Oct 2015, but dropped to 60/9.5Mbps @ 12dB from Dec 2015. Those are all sync rates, not speedtest results.

hio77

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Lizard Networks

#1665220 7-Nov-2016 17:17

12dB profiles exist as stability profiles, just as 9dB profiles used to exist for edgecases but hardly ever seen.

Your snr is likely not miss reporting there but actually on a 12dB profile..

Out of date screenshot from a few years back but a picture tells so much more, Below is the old DLM movements. Note the 9 & 12dB profiles.

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Jase2985

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#1665231 7-Nov-2016 17:46

My SNR is currently 12.8 and has been as high as 15.5dB.

I believe its because my line is hitting the maximum speed so there is no need to have a Low SNR to achieve the best speed, so it just raises the SNR to a higher level.

hio77

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Lizard Networks

#1665232 7-Nov-2016 17:57

Jase2985:

My SNR is currently 12.8 and has been as high as 15.5dB.

I believe its because my line is hitting the maximum speed so there is no need to have a Low SNR to achieve the best speed, so it just raises the SNR to a higher level.

on a maxed line this will be the case, not the same situation though.

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Jase2985

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#1665233 7-Nov-2016 17:59

hio77:

Jase2985:

My SNR is currently 12.8 and has been as high as 15.5dB.

I believe its because my line is hitting the maximum speed so there is no need to have a Low SNR to achieve the best speed, so it just raises the SNR to a higher level.

on a maxed line this will be the case, not the same situation though.

i know, but it is an answer to his initial question :)

nickt

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Master Geek

#1665314 7-Nov-2016 19:51

OK, so the DSLAM decided that 12dB was needed last year and has stuck with it since. Thanks for the info.

hio77

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Lizard Networks

#1665320 7-Nov-2016 20:09

nickt: OK, so the DSLAM decided that 12dB was needed last year and has stuck with it since. Thanks for the info.

Yes, DLM sets your training margin.

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itey

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Ultimate Geek

#1672136 16-Nov-2016 15:03

I have vdsl with bigpipe, I was expecting a faster upstream sync speed given the excellent downstream sync. Any thoughts? (using HG695b) The upstream attenuation looks a bit high ? (don't have a master filter installed)

DSL synchronization status:
Up
Connection status:
Showtime
Upstream line rate (kbit/s):
9975
Downstream line rate (kbit/s):
69993
Maximum upstream rate (kbit/s):
10032
Maximum downstream rate (kbit/s):
71906
Upstream noise safety coefficient (dB):
8.8
Downstream noise safety coefficient (dB):
9.9
Upstream interleave depth:
0
Downstream interleave depth:
0
Line standard:
VDSL
Upstream line attenuation (dB):
19.9
Downstream line attenuation (dB):
9.3
Upstream output power (dBmV):
-10.6
Downstream output power (dBmV):
15.1
Downstream interleave depth:
None

mentalinc

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#1672189 16-Nov-2016 16:05

If you've had the install for less than 10 days wait for DLM to do it's thing..

otherwise yeah I'd expecting closer to 30Mbit up based on my stats below

DSL synchronization status:
Up
Connection status:
Showtime
Upstream line rate (kbit/s):
29984
Downstream line rate (kbit/s):
69993
Maximum upstream rate (kbit/s):
37544
Maximum downstream rate (kbit/s):
96528
Upstream noise safety coefficient (dB):
13.4
Downstream noise safety coefficient (dB):
16.5
Upstream interleave depth:
0
Downstream interleave depth:
0
Line standard:
VDSL
Upstream line attenuation (dB):
0
Downstream line attenuation (dB):
0
Upstream output power (dBmV):
0
Downstream output power (dBmV):
14.5
Downstream interleave depth:

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hio77

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Lizard Networks

#1672204 16-Nov-2016 16:17

Your on a 8b sync, that specturm allocation will only really do 9~13Mbit depending on copper condition..

Your line looks likely slightly too long to jump onto 17a, Although give it time and you may be lucky.

More than likely, given your stats, around 10 up is all you will get. Which for 8b VDSL is great.

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mentalinc

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#1694527 24-Dec-2016 08:13

Hi All

VDSL cut over was Wednesday night for my parents, stats are below, but its dropped from 30/4 Mbit to 4/.8 after last nights reboot.

I installed a vdsl master filter, but didn't replace the vdsl faceplate. Should we be doing that now or at least direct wiring the modem in the meantime?

they were around 12/1 on ADSL.

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Jase2985

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#1694534 24-Dec-2016 09:23

why was it rebooted? you shouldnt reboot a VDSL connection unless you have to as it can affect the DLM which access the line and determines the profile and speed you should be on

mentalinc

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#1694542 24-Dec-2016 10:48

Not been rebooted, it's still in first 10 days of DLM so my guess is DLM did a resync, which i saw daily on my on VDSL line during DLM.

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Jase2985

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#1694595 24-Dec-2016 15:23

i assumed when you said reboot you did it

Reboot = power cycle device
resync = drop and reconnect DSL session (what DLM does)

DLM shouldn't be doing things every night/morning.

does your modem show the errors? CRC and FEC etc?

hio77

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Lizard Networks

#1694635 24-Dec-2016 17:43

Looks like you have moved to a 12dB profile, this is often a sign that DLM is really not happy with your line.

I would run a clean connection from the master filter in the ETP to a new jackpoint. cat5e+ all the way to cut out on any loss there.

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