VDSL Performance & Tuning

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#800604 16-Apr-2013 23:14

No problemo! :)

We believe that 17a profile swaps are now fully automated. As long as your line is good enough (and yours is definitely looking that way) it's highly likely you'll be swapped to 17a.

SamF

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#800607 16-Apr-2013 23:16

networkn: If I am on a profile that gives me 70/10 (DSL Line Speeds reported by modem) and I switch providers, will I get 70/10 from the new provider?

Assuming that provider isn't using their own exchange / cabinet gear, then yes.

stevehodge

393 posts

Ultimate Geek

#800624 17-Apr-2013 00:52

SamF:
Attenuation: 0db (VERY good if this is accurate, but you'd have to be basically living on top of the cabinet for Rate: Downstream: 38.8mbit (not bad, but if your attenuation is accurate I'd expect higher than that), this to be true!)

Yes, that attenuation looks suspicious and the downstream rate doesn't back it up. When I was first connected on DLM-6 with 4db attenuation I got 42.9 Mbit/s.

One odd thing I did notice was your modem's reported 'downstream attainable rate', which it listed as 42mbit. This is strange because it should read 70mbit, which is standard across the board. It may not mean anything however.

No, attainable is usually around what your sync speed is. It's the max DSLAM throughput that should be 70 Mbit/s. So 42 Mbit/s is what I'd expect to see.

redstorm

56 posts

Master Geek

#800658 17-Apr-2013 07:47

Over the last few days DLM has moved me onto DLM1

Perviously i was on16ms 0INP then 8ms 0INP and this morning on am on 1ms and 0INP

However if i don't do anything i doubt i will still be on DLM1 tomorrow, as my CRCPM are too high, On DLM2 it was around 2 -3 per 15minutes rougly 0.25crcpm

Currently CRCPM is too high to remain on DLM1 , i have read that the advice is to make one change and make it a good one. So my thinking is to move the line settings SNR closer to maximum stability, any advice on how far i should go or other tweaks i should do for my one change to try and stay on DLM1? im not concerned about the DL speed.

Xternal

24 posts

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#801071 17-Apr-2013 15:54

My new VDSL connection:

First sync

I plan on running some cat5e from the ETP straight into the back of the fritz!box.

SamF

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#801077 17-Apr-2013 16:00

Wow, DLM-1 on first sync!? I guess your attenuation is pretty sweet tho so that might be the reason for that! I expect you'll be on a 17a (ie; 70mbit) profile very soon as well! However you will need to sort out your CRC errors tho (which will probably be sorted with your planned ETP Cat5E upgrade).

SamF

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#801256 18-Apr-2013 00:24

@stevehodge: How long were you on DLM-1 with a CRCPM of 7? It was weeks wasn't it?

@redstorm: Let us know if / when you get dropped from DLM-1, that'll give us some clues as to where the threshold is (we're still trying to work it out). In terms of recommendations, I'd push the SNRM all the way towards 'maximum stability', see what your errors are and then adjust from there. However if, in the interests of science, you're willing to leave it as is for now until you get dropped from DLM-1 it would give us some valuable info! :)

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hio77

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Lizard Networks

#801257 18-Apr-2013 00:26

SamF: @stevehodge: How long were you on DLM-1 with a CRCPM of 7? It was weeks wasn't it?

weeks? maybe i should have just played mine out!

#include <std_disclaimer>

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

SamF

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#801258 18-Apr-2013 00:41

Naa, your errors were way too high (as evidenced by your drop from DLM-1 the next day).

stevehodge

393 posts

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#801259 18-Apr-2013 00:42

SamF: @stevehodge: How long were you on DLM-1 with a CRCPM of 7? It was weeks wasn't it?

I've had several periods of high CRC error rates:
The first time I got on DLM-1 I had error rate around 3-4 per minute. That lasted about a month before I got kicked back down to DLM-2.
There was a 3 day stretch with CRC errors around 6-7. I had an SNRM of about 5 for some reason.
6 weeks later, just before I got put on 17a I had a weird connection with very high sync and very high CRC errors - as high as 50 per minute. That also had an oddly low SNRM set. I did a manual resync after less than a day.

My current 17a connection has been up 72 days now with error rate around 0.5 CRC/min.

SamF

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#801260 18-Apr-2013 00:45

So did you manually intervene when your errors were 6-7?

hio77

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Lizard Networks

#801261 18-Apr-2013 00:47

SamF: Naa, your errors were way too high (as evidenced by your drop from DLM-1 the next day).

drop back down happened from the reboots, given it was very likely it was going to drop down anyway, im moreso looking at it as what would have happened if i just left it be, if someone else was able to hold it for a fair bit of time before falling back.

should have just pulled my performance settings right down from the default position (remembering it was set to max when shipped out to me, so i'm taking that as "default") rather than going down in little jumps

ah well, i have the upcoming weeks off, so i'll be getting my line sorted, properly request a DLM reset after that.

#include <std_disclaimer>

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

SamF

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#801262 18-Apr-2013 00:49

Yeah, fair enough. Sounds like a good plan.

stevehodge

393 posts

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#801308 18-Apr-2013 08:45

SamF: So did you manually intervene when your errors were 6-7?

I can't remember if I forced a resync or it happened for some other reason (it was back in December). It wasn't a 4am DLM resync. I did stay on DLM-1 afterwards.

redstorm

56 posts

Master Geek

#802028 19-Apr-2013 06:36

SamF: @stevehodge: How long were you on DLM-1 with a CRCPM of 7? It was weeks wasn't it?

@redstorm: Let us know if / when you get dropped from DLM-1, that'll give us some clues as to where the threshold is (we're still trying to work it out). In terms of recommendations, I'd push the SNRM all the way towards 'maximum stability', see what your errors are and then adjust from there. However if, in the interests of science, you're willing to leave it as is for now until you get dropped from DLM-1 it would give us some valuable info! :)

Got dropped off 4am this morning.

No changes were made.

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