VDSL Performance & Tuning

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371 posts

Ultimate Geek

#907146 3-Oct-2013 14:28

hio77:
mikenzb: I wonder if the line attenuation 0 is a bug or if thats the real deal...

out of curiosity, whats your distance from your cabinet?

and whats the distance electrically (assuming your fritz has telnet access available)

Well... I don't know how to find that out but heres a picture using google maps.

My guess is 10-20 meters.

hio77:
the one thing that does interest me, is your attainable on the upstream is odd on the .22 firmware, attainable being nothing more than a grain of salt mindyou.

Isnt that a bug on all .22 firmwares, they tried to fix it in .51 but they fail and made it 102?

Can someone confirm this for me.
Found it on page 118.

stevehodge:
mikenzb: By the way I had a quick question, Can someone explain why my Send Direction Line attenuation is 102? I see others in this thread also have 102 on the Send Direction Line attenuation as well.

It's a bug. The previous version of the firmware didn't display anything at all, now there is a number but it's clearly incorrect.

hio77

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Lizard Networks

#907166 3-Oct-2013 14:42

mikenzb:
Well... I don't know how to find out that but heres a picture using google maps.
My guess is 10-20 meters.

oh wow, that is closes indeed..

terms of electrically encase you would like to try, or anyone else...

you need to telnet into your frizbox (ild recommend using putty for this since microsoft aren't including telnet clients anymore.)

once logged in and at the # prompt type vdsl

it should come up with a huge menu, giving you a prompt of cpe>

you want option 11 (Request Extended Port Status)

that will print out a bunch of information

the figure your looking for is "VDSL Estimated Loop Length" (remember this is electrically calculated so it could easily be wrong.)

little footnote, be sure to quit the cpe prompt (ild recommend ctrl+c) as i found when testing with it, your connection wont reconise it has disconnected until you close it. since it is the manual interface for the vdsl interface on the fritz.

the calculations seem reasonably accurate through my testing (except at the current place, but then my attention goes from 4~7 so go figure there.)

im looking for a consistent way i can make this data available via my tool, but the cpe tool really isn't very friendly to automation due to the way it takes user input combined with telnets

#include <std_disclaimer>

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

stevehodge

393 posts

Ultimate Geek

#907204 3-Oct-2013 15:31

mikenzb:
hio77:
the one thing that does interest me, is your attainable on the upstream is odd on the .22 firmware, attainable being nothing more than a grain of salt mindyou.

Isnt that a bug on all .22 firmwares, they tried to fix it in .51 but they fail and made it 102?

Can someone confirm this for me.
Found it on page 118.
stevehodge:
mikenzb: By the way I had a quick question, Can someone explain why my Send Direction Line attenuation is 102? I see others in this thread also have 102 on the Send Direction Line attenuation as well.

It's a bug. The previous version of the firmware didn't display anything at all, now there is a number but it's clearly incorrect.

That's the upstream attenuation on .51 - it shows an incorrect number (in .22 it doesn't show anything). But upstream attainable throughput is bugged in .22 - it often shows a much lower number than the current throughput. Mine right now is showing 0 from attainable and 10360 for current.

hio77

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Lizard Networks

#907207 3-Oct-2013 15:35

stevehodge:
mikenzb:
hio77:
the one thing that does interest me, is your attainable on the upstream is odd on the .22 firmware, attainable being nothing more than a grain of salt mindyou.

Isnt that a bug on all .22 firmwares, they tried to fix it in .51 but they fail and made it 102?

Can someone confirm this for me.
Found it on page 118.
stevehodge:
mikenzb: By the way I had a quick question, Can someone explain why my Send Direction Line attenuation is 102? I see others in this thread also have 102 on the Send Direction Line attenuation as well.

It's a bug. The previous version of the firmware didn't display anything at all, now there is a number but it's clearly incorrect.

That's the upstream attenuation on .51 - it shows an incorrect number (in .22 it doesn't show anything). But upstream attainable throughput is bugged in .22 - it often shows a much lower number than the current throughput. Mine right now is showing 0 from attainable and 10360 for current.

ah, been awhile since i have had a correctly working .22 to test with, forgot about that bug

#include <std_disclaimer>

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

HiTM4N

256 posts

Ultimate Geek

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#907403 3-Oct-2013 19:32

mikenzb: So I gave it a long and hard thought on jumping back down from .51 fireware to .22 and I made the jump today.

I would to personally thank Chris from the Snap Support Team for helping me along the way of configuring my fritz box when I got it back up and everything...

Pretty happy overall, requested the DLM to be reset to see if I could get off DLM 2 and maybe in the next 2 weeks I'll be tweaking it.

Edit: Also Line attenuation 0

I would love to give this a go myself...Dont suppose you took note of the required settings? :P

Love of all phones, computers and gadgets

bagheera

539 posts

Ultimate Geek

#907406 3-Oct-2013 19:35

hio77:
(ild recommend using putty for this since microsoft aren't including telnet clients anymore.)

it is there - just not installed by default in windows 7 & 8 - if you go to features it a tick box to turn on - that said, putty is still better telnet client

hio77

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Lizard Networks

#907424 3-Oct-2013 19:53

bagheera:
hio77:
(ild recommend using putty for this since microsoft aren't including telnet clients anymore.)

it is there - just not installed by default in windows 7 & 8 - if you go to features it a tick box to turn on - that said, putty is still better telnet client

your right, made a fopa there.. none the less, putty is indeed far better.

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mikenzb

371 posts

Ultimate Geek

#907576 4-Oct-2013 04:45

HiTM4N:
I would love to give this a go myself...Dont suppose you took note of the required settings? :P

I sent a email to the snap support team asking for what settings to configure when I downgraded and basically got the DSL synced up then I gave the Snap support team a call and enabled remote assess on my fritz. They added in the VOiP Settings and other jazz that was missing.

I'll PM you now with the settings.

mikenzb

371 posts

Ultimate Geek

#907577 4-Oct-2013 04:46

hio77:
mikenzb:
Well... I don't know how to find out that but heres a picture using google maps.
My guess is 10-20 meters.

oh wow, that is closes indeed..

terms of electrically encase you would like to try, or anyone else...

you need to telnet into your frizbox (ild recommend using putty for this since microsoft aren't including telnet clients anymore.)

once logged in and at the # prompt type vdsl

it should come up with a huge menu, giving you a prompt of cpe>

you want option 11 (Request Extended Port Status)

that will print out a bunch of information

the figure your looking for is "VDSL Estimated Loop Length" (remember this is electrically calculated so it could easily be wrong.)

little footnote, be sure to quit the cpe prompt (ild recommend ctrl+c) as i found when testing with it, your connection wont reconise it has disconnected until you close it. since it is the manual interface for the vdsl interface on the fritz.

the calculations seem reasonably accurate through my testing (except at the current place, but then my attention goes from 4~7 so go figure there.)

im looking for a consistent way i can make this data available via my tool, but the cpe tool really isn't very friendly to automation due to the way it takes user input combined with telnets

253 ft or 77 metres (Yeah that sounds about right)

Paul1977

5047 posts

Uber Geek

#907693 4-Oct-2013 09:42

hio77:in my experience FECs at large counts dont seem to alter DLM, but i suspect at DLM-1 they play a larger role, considering the 1ms latency.. less room for corrections to be possible...

I was stuck in DLM-7 for ages, and then DLM-8. I had no CRC errors and spontaneous resyncs were very rare. However I did have FEC errors constantly in the hundreds of thousands per 15 min (often in the millions).

Snap said the FEC errors would be why my DLM profile was so bad (whether this is true or not....)

The other night my CRC errors shot through the roof for several hours and then after resyncing overnight my FEC errors were down in the hundreds per 15min, the CRC errors were gone, and my DLM profile had improved by one level. I'm guessing Chorus did something.

After the low FEC count had remained for a couple of days I requested a DLM reset and have been on DLM-1 since (I'm still in the 10 day training period, but fingers crossed). CRC errors have climbed up since the DLM reset, but hopefully still low enough to keep me on DLM-1.

Before:

Today:

So, long story short - in my case the high FEC error count appears to have been the symptom of a line/cabinet problem.

Paul1977

5047 posts

Uber Geek

#907695 4-Oct-2013 09:45

Note on above: You may be able to tell from the screenshot that I downgraded my firmware to .22 last night, but all the improvements happened prior to doing that.

hio77

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Lizard Networks

#907706 4-Oct-2013 09:58

i suspect FECs in the 500Ks may be some cause for a DLM move backwards..

#include <std_disclaimer>

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hio77

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#907708 4-Oct-2013 09:58

mikenzb:
253 ft or 77 metres (Yeah that sounds about right)

awesome! 77M would make about sense with the way they seem to run cables

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Paul1977

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#907747 4-Oct-2013 10:56

How can I tell if the aerial lead to my demarc is tru-rip or 049? What's the difference?

hio77

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#907767 4-Oct-2013 11:12

Paul1977: How can I tell if the aerial lead to my demarc is tru-rip or 049? What's the difference?

ild suggest take a photo close if possible, and posting it for someone who knows more to give you a precise answer..

#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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