VDSL Performance & Tuning

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Lizard Networks

#989873 18-Feb-2014 18:37

stevehodge:
hio77: DLM is has you already on DLM-1, there isnt much moves DLM can make.

Exactly. If you really want to find out you could try rebooting the Fritz 4 or 5 times. That should get you kicked down to DLM-2 within a couple of days. I don't recommend it though.

this is something i have considered doing, to see if it would sort the DLM-1 speed drop i got after fixing the noise issue with the switch...

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nzgeek

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#990324 19-Feb-2014 11:57

hio77: DLM is has you already on DLM-1, there isnt much moves DLM can make.

With the CRC error rates I had been seeing, I thought I might be pushed back to DLM-2 or DLM-4.

Prior to my stuff-up, I was getting up to 724 errors per hour. Even now, my error rates have been creeping up and my graph is showing up to 292 CRC errors per hour (4.87 per minute). I'll try to take a screenshot around 3pm so that it can be compared to yesterday's. I may not be able to upload it until later, due to meetings.

hio77: what is typically seen, is profile moves from DLM profiles to others. as lines generally start on DLM-1 (as yours did) its not likely to change if your line doesnt 'require' a change.

As strange as this sounds, I'm hoping that my CRC error levels get high enough to force some sort of change. I just want to know that DLM is making adjustments, rather than leaving me with a line full of errors.

hio77

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#990381 19-Feb-2014 12:59

if you want a change, sit at your modem, pull it out, plug it in a few times.

DLM-1 doesnt like more than 1 explainable resync a day..

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Amosnz

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#990398 19-Feb-2014 13:05

hio77: if you want a change, sit at your modem, pull it out, plug it in a few times.

DLM-1 doesnt like more than 1 explainable resync a day..

When I first bridged my modem it took 3-4 resets in a short period of time to get it working properly, and I had dropped from a very stable DLM1 line to DLM2.
It took me 3 months to get back onto DLM1 again, so while dropping down might be easy, getting back is very hard!

For some reason my VDSL router stopped replying on its LAN address a couple of months ago so I cant web into it or telnet into it anymore. It still operates fine so I haven't bothered rebooting it as I don't want to risk a DLM downgrade.

Speedtest

hio77

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#990402 19-Feb-2014 13:10

Amosnz:
hio77: if you want a change, sit at your modem, pull it out, plug it in a few times.

DLM-1 doesnt like more than 1 explainable resync a day..

When I first bridged my modem it took 3-4 resets in a short period of time to get it working properly, and I had dropped from a very stable DLM1 line to DLM2.
It took me 3 months to get back onto DLM1 again, so while dropping down might be easy, getting back is very hard!

For some reason my VDSL router stopped replying on its LAN address a couple of months ago so I cant web into it or telnet into it anymore. It still operates fine so I haven't bothered rebooting it as I don't want to risk a DLM downgrade.

how long was your connection setup for though? DLM gets "lazy" once its been going for awhile.

if your modem reboots once, its not going to do anything.

always possible to drop down to DLM-2, then request DLM to be reset.

absolutely though, its a risk to take.

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nzgeek

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#990658 19-Feb-2014 17:56

Line quality is definitely getting worse. I'm quickly climbing towards 300 CRC errors per hour. It seems that the longer the Fritz stays connected, the higher the error rate gets.

Taken 14:59, a little over 3 hours ago. The latest graph shows record values for those 3 hours, with 352 in the 5pm column.

I'm going to have a dig around tonight and see if I can find a power strip or double adapter doesn't have a surge protector built in. I want to eliminate the possibility that a dirty power feed is causing issues with the outbound signal.

I'll be ordering a UPS in the near future too, when I've found one I can hide in a spot near the Fritz.

hio77

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#990673 19-Feb-2014 18:26

Try removing any Ethernet connected devices for a night. I'm seeing simular patterns in your errors to what my green switch causes ...

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nzgeek

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#990680 19-Feb-2014 18:41

The only things physically connected to the router are an external hard drive (USB) and a cordless phone. Everything else is on Wi-Fi, spread between 2.4GHz and 5GHz. I'll try unplugging the drive and phone one at a time and see how the error rates change, if they change at all.

I'm also getting more and more suspicious of the card I'm on. Looking back through the thread, it's rare for someone not to be put on DLM-6 when their DLM is reset. I've been solidly stuck on DLM-1, even with skyrocketing error rates. I'd rather not mess with the cable to force errors, as I've caused the card to require a hard reset already, but I would like to see some sign of my line being adjusted.

hio77

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#990682 19-Feb-2014 18:44

connections used to start on DLM-6, they now start on DLM-1 usually.

scrap that idea in that case, it just looked far too familiar.

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nzgeek

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#991063 20-Feb-2014 12:44

I ended up unplugging both the phone and the hard drive for a few hours and the CRC errors didn't drop in the slightest. Whatever the problem is, it's not due to attached devices.

I think the next step is the power source. I've just ordered a UPS and it should arrive by early next week. I'll switch to that ASAP and see if it has any effect on the CRC rates.

hio77

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#991066 20-Feb-2014 12:47

nzgeek: I ended up unplugging both the phone and the hard drive for a few hours and the CRC errors didn't drop in the slightest. Whatever the problem is, it's not due to attached devices.

I think the next step is the power source. I've just ordered a UPS and it should arrive by early next week. I'll switch to that ASAP and see if it has any effect on the CRC rates.

good to know, i suspected it wouldnt carry across thoses ports.

by all rights, noise coming from ethernet ports, shouldnt affect the dsl port too though > still frustrated that that switch is pretty dead to me.. yet to find a replacement..

might also wanna on the off chance, check if something has been knocked loose.

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droopanu

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#991073 20-Feb-2014 12:55

My HG659 tells me that the uplink max speed is 40Mbps and the line attenuation is 0. Quite hard to believe it. What do you reckon? Is it going bonkers? :D

DSL synchronization status:
Up Connection status: Showtime
Upstream line rate (kbit/s): 10342
Downstream line rate (kbit/s): 41055
Maximum upstream rate (kbit/s): 41280
Maximum downstream rate (kbit/s): 41568
Upstream noise safety coefficient (dB): 25.8
Downstream noise safety coefficient (dB): 12.4
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): 4.1
Downstream output power (dBmV): 10.6
Downstream interleave depth: None
DSL up time: 2 days 8 hours 43 minutes 45 seconds

hio77

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#991077 20-Feb-2014 13:00

line attenuation seems to be a pretty stock typical bug (we have seen it witth the slingshot modem too.)

as for the upstream, on a 17a profile, it is well underused. to best explain it, heres an example of my spectrum on its first 17a sync, and there after where it settled to.

the green patches are upstream, unfortunately, we are limited to 10mbit upload on vdsl, which arguably is somewhat underusing the area given there.

end of the day, your attainable upload will always be pretty high over your synced rate.

given your attainable upload, i suspect you are on a 17a profile there, which seems a little odd for your download speed.

ill confirm it with TimA when he wakes up on the HG659 bug, and if its fixed in an update though.

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kentnl

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#991183 20-Feb-2014 15:38

There's some cosmetic features in the 6. beta firmware I'm not sure has been noted in this thread yet.

1. The spectrum graph updates in semi-realtime.
2. The values on the DSL page sometimes update while you're watching them. ( current us/ds usually ).
3. There's now a "show maximum and minimum" on the spectrum panel that shows the measured peaks/minimums in conjuction with current stats.

hio77

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#991201 20-Feb-2014 16:11

kentnl: There's some cosmetic features in the 6. beta firmware I'm not sure has been noted in this thread yet.

1. The spectrum graph updates in semi-realtime.
2. The values on the DSL page sometimes update while you're watching them. ( current us/ds usually ).
3. There's now a "show maximum and minimum" on the spectrum panel that shows the measured peaks/minimums in conjuction with current stats.

this brings another question for Brent, has Seamless rate adaptation been implemented to chorus's network now?

fyi, realtime updates are in dating back to 5.22, and the max/min has been in since 5.51. just hasnt really been useful, until now if SRA has been enabled on chorus gear recently (which looking at your results, maybe it has..)

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