VDSL Performance & Tuning

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860 posts

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#898794 19-Sep-2013 23:51

These are my pre-vdsl stats...

Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 11.9 12.3
Attenuation (dB): 3.0 0.1
Output Power (dBm): 12.8 0.0
Attainable Rate (Kbps): 22416 1304
Rate (Kbps): 22232 1241

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hio77

'That VDSL Cat'
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Lizard Networks

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#898795 19-Sep-2013 23:55

Psilan: These are my pre-vdsl stats...

Mode: ADSL2+
Line Coding: Trellis On
Status: No Defect
Link Power State: L0

Downstream Upstream
SNR Margin (dB): 11.9 12.3
Attenuation (dB): 3.0 0.1
Output Power (dBm): 12.8 0.0
Attainable Rate (Kbps): 22416 1304
Rate (Kbps): 22232 1241

yup, being that the attention isnt wrong there - which the sync rate would indicate it isnt. you have a rather large issue that occurred at previsioning..

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Psilan

860 posts

Ultimate Geek
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#898796 19-Sep-2013 23:56

Just sent off email to snap. Let's see how I go :-) .

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hio77

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#898797 20-Sep-2013 00:00

Psilan: Just sent off email to snap. Let's see how I go :-) .

mhm.. it does explain why the spectrum looked a little tooooo good for the attention at the upper end..

ild say the RFI has a fair bit to do to it going by a few others who have had RFI spikes on theirs..

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SKYMAX

43 posts

Geek
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#899274 20-Sep-2013 22:54

Hey guys, haven't posted on here for a while now, but couldn't resist after the results of a new VDSL connection I got set-up (not at my place, boo hoo).

Those are some sweet sync numbers!

hio77

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#899275 20-Sep-2013 23:04

for a 9db attention , that is pretty good

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SamF

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#899276 20-Sep-2013 23:05

What type of router is that?

Also, I would be surprised if 9.6db is the correct attenuation - as far as we know 7db is the max for a 17a profile!

stevehodge

393 posts

Ultimate Geek
+1 received by user: 52

#899278 20-Sep-2013 23:39

SamF: What type of router is that?

Also, I would be surprised if 9.6db is the correct attenuation - as far as we know 7db is the max for a 17a profile!

Is that 7db the limit before going to 17a or after? A 7-8 db under 8b would be about 9-10 db under 17a.

hio77

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#899280 20-Sep-2013 23:59

SamF: What type of router is that?

Also, I would be surprised if 9.6db is the correct attenuation - as far as we know 7db is the max for a 17a profile!

17a attention boost ild say..

its one of thoses telecom vdsl modems if im not mistaken.. tgnsomething..

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SamF

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#899286 21-Sep-2013 00:23

stevehodge:
SamF: What type of router is that?

Also, I would be surprised if 9.6db is the correct attenuation - as far as we know 7db is the max for a 17a profile!

Is that 7db the limit before going to 17a or after? A 7-8 db under 8b would be about 9-10 db under 17a.

Ah yes, you are probably correct Steve :)

SKYMAX

43 posts

Geek
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#899329 21-Sep-2013 08:49

Yeah, it's a Telecom connection (wrong forum I know, but this forum seems to appreciate sync speed data better than other ones, lol). Modem is a Telecom (Pace) V5542.
It's about 170m from the roadside cabinet, but it's a newish area, so modern wiring in the street and premises.

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Psilan

860 posts

Ultimate Geek
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#899392 21-Sep-2013 12:11

Snap say that my connection has not been "completed" by chorus yet.
I think this is just the splitter install that was booked, but installed earlier than anticipated.

We'll see what happens :). 3 to 26 attenuation is weird.

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Vladmax

39 posts

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#901519 23-Sep-2013 21:38

FritzBox re-synced about 3 days ago, besides sync rate drop from 47 to 43 also got the unusual readings again. Any comments?

Latency is not 1, 8 or 16 - it's just "fast" :)
SNR is not 12 or 9 - it's 13

Also SNR on "Statistic" tab doesn't seem to match SNR on DSL tab...

BTW, I had status of my connection as "NOT COMPLETE" by Chorus for a while (not sure of what it is now though), the downside is that SNAP support can't tap into the exchange in case they need to solve any problems while the connection is in this state. And I don't think connection status change affects performance at all.

stevehodge

393 posts

Ultimate Geek
+1 received by user: 52

#901528 23-Sep-2013 22:08

Vladmax: FritzBox re-synced about 3 days ago, besides sync rate drop from 47 to 43 also got the unusual readings again. Any comments?

Latency is not 1, 8 or 16 - it's just "fast" :)
SNR is not 12 or 9 - it's 13

Also SNR on "Statistic" tab doesn't seem to match SNR on DSL tab...

Latency showing "fast" is a symptom of having the latest firmware. I believe "fast" corresponds to 1ms though I don't think anyone has actually reported anything different. It's possible the drop in sync speed is due to the new firmware as well - it does seem to be a bit slower in some situations. It could also just be a bad sync.

Your error rate looks worrying. 4 CRC per minute is ok (but not great), however it doesn't match what the graph is showing which is more like 12-15 per minute. I'd tend to believe the graph. We think 12-15 CRC/min is above the limit for staying on DLM-1.

SNR on the DSL page is "signal to noise margin" which is you can think of as the padding over the minimum signal required for the current sync rate. It's headroom so that the connection is less likely to drop if line conditions worsen. Don't worry if it's not exactly 12 db, 12 db is the target but it can vary with conditions and it's not uncommon for it to be out by 1 or 2 db.

SNR on the statistic tab is the real "signal to noise ratio" at each frequency. Your SNR graph looks very similar to mine on 8b when I was getting 48 Mbps downstream sync. Your 43 Mpbs does seem a little low (though my attenuation was better than yours).

Not sure what to say in terms of recommendations. I'd probably try a reboot just to see if it helps. I don't yet trust the new firmware either so I might be inclined to try reverting to the previous version, at least if you were seeing 1ms before on the DSL tab and now have "fast" (which would indicate a firmware upgrade).

mattgreen

133 posts

Master Geek
+1 received by user: 6

#901573 23-Sep-2013 23:17

Vladmax: FritzBox re-synced about 3 days ago, besides sync rate drop from 47 to 43 also got the unusual readings again. Any comments?

I have had something similar happen on Saturday... Dropped from 43 down to 39. Have also been bumped to DLM-2.. Lots of errors too. Strangely the Fritz is reporting I'm on 17a profile but there's no way I am (and it doesn't show the extra bands).

Something weird has definitely happened on Saturday morning. I've been on DLM-1 with 43-44Mbps since install a year ago so pretty bummed.

Called Snap and they're reseting DLM in the hope it was a glitch but I have a bad feeling about where this is heading.

One thing I noticed is that the Fritz is reporting the exchange as a Broadcom. I'm sure it was Ikanos before but I can't find a screenshot of it... Might be a clue.. Might be nothing.

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