VDSL Performance & Tuning

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202 posts

Master Geek

#663533 29-Jul-2012 11:11

Yea or by changing your INP.

Your SNRM looks consistent.

This is mine

SamF

1578 posts

Uber Geek

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#663536 29-Jul-2012 11:27

Oh, can you change INP via config hacking? Also, what would this achieve & what would the down-sides be?

SKYMAX

43 posts

Geek

#663608 29-Jul-2012 14:23

Good news everybody (said like Dr Farnsworth off Futurama, lol).

I modded my house wiring and gained around 4Mbps in sync speed and went from DLM-6 to DLM-2.

-JASON-

SamF

1578 posts

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#663628 29-Jul-2012 15:16

Nice!! Looking good! Will be interesting to see your CRC errors over time.

Napster

202 posts

Master Geek

#663984 30-Jul-2012 14:05

Sam, you can change the INP in the LineSettings tab.
if you move it towards stability i think it adds a max of 4 INP. Should lower your Errors due to lower bitrate.

Have not played with that setting much.

SamF

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#664014 30-Jul-2012 14:33

Hmm, I guess that might restrict DLM, but that's a matter of debate at the moment I suppose...

Napster

202 posts

Master Geek

#664016 30-Jul-2012 14:37

Yea, by the way any change in DLM profile yet?

Tradepub

Free professional, reference and technical white papers (affiliate link).

SamF

1578 posts

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#664022 30-Jul-2012 14:50

Nope, not a thing. Might try a resync tonight.

Any ideas how INP works?

SamF

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#664323 30-Jul-2012 23:46

Well, I forced a resync tonight - total uptime 10 days 19hrs! I'm now on DLM-2 with bitswap on. So it looks like I should have been re-synced earlier but for whatever reason that didn't happen.

Anyway, that's some progress and one for the notes; if you think you're overdue for a DLM profile change, try a manual resync! :D

Napster

202 posts

Master Geek

#664338 31-Jul-2012 00:09

Oh nice, Good to see that it works that way as well. I am coming up to the 7 days trigger tonight so will see if my profile changes back to DLM-1

By the way i have got a fair idea about how INP works but ill try and find a link somewhere with more info.

Napster

202 posts

Master Geek

#664589 31-Jul-2012 13:49

No change this morning, still DLM-2

SKYMAX

43 posts

Geek

#664807 31-Jul-2012 18:12

Hey guys, here's two things that I find interesting:

In this shot you can see that the attainable throughput is higher than the max DSLAM throughput:

And there was an automatic resync at 4am, which now results in errors. However the DLM settings appear not to have changed (from the pic above).

I may force a resync this evening, to see if the errors disappear again. Perhaps the shift in SNR dB suggests something???

-JASON-

Napster

202 posts

Master Geek

#664926 31-Jul-2012 20:39

You may have moved from DLM-4 to DLM-2. It seems you don't see the 1 INP value set on DLM-4.

Though this may be due to a specific firmware on the Fritzbox.

By the way don't worry about the errors to much, that is hardly anything and shouldn't affect throughput or packet loss.

SamF

1578 posts

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#665014 31-Jul-2012 22:15

SKYMAX: Has your sync rate changed? I found that my errors increased significantly with only a 1mbit sync rate increase.

I was on DLM-4 until last night and it showed INP of 1.0. However, I am running firmware v99.05.22, so maybe that's the difference.

What I'd like to know is what error threshold DLM considers 'unstable'!

SKYMAX

43 posts

Geek

#665106 1-Aug-2012 07:07

You can compare my snapshot above with the 3rd post of this page.
The sync speed went up marginally.

-JASON-

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