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587 posts

Ultimate Geek
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  # 1251454 5-Mar-2015 01:00
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Try using the tracert command to see the timings at each hop. For example:

C:\> tracert www.nzherald.co.nz

The tracert command (called traceroute on Linux) works a bit like ping, but instead of just giving you the total time to reach the destination, it breaks down the times for each hop along the way. The first hop will be your router, the second will be a Snap router, etc.

In my case, I get about 1ms latency between my laptop and the Fritz!Box (802.11n WiFi @ 5GHz). The second hop averages about 7ms latency, meaning there's about 6ms latency between my router and Snap's router. Hops 3-8 all show about 7ms latency, meaning that there's practically zero latency between Snap and The Herald.

You can use the latency between the first and second hops to help guess at your DLM profile. Possible VDSL latency values are 1ms, 8ms and 16ms. Look at the time between hops 1 and 2 and compare it to these values. Pick the largest of these 3 values that's less than the hop time, and that's most likely your VDSL latency. In my case this time is 6ms, so my VDSL latency is 1ms.

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  # 1251485 5-Mar-2015 08:21
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just a random note from my connection

i was connected with a SNR of 9dB on my spark connection (unsure how that happened) and it has been really stable for about 75 days, it reconnected the other day and its back to the standard 12dB.

my sync speed has gone from 55 down to 49 down, and all that seems to have changed is the SNR. not that im complaining, i just thought it was interesting to see the difference.

 
 
 
 


'That VDSL Cat'
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  # 1251559 5-Mar-2015 10:56
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Jase2985: just a random note from my connection

i was connected with a SNR of 9dB on my spark connection (unsure how that happened) and it has been really stable for about 75 days, it reconnected the other day and its back to the standard 12dB.

my sync speed has gone from 55 down to 49 down, and all that seems to have changed is the SNR. not that im complaining, i just thought it was interesting to see the difference.


a drop of 3dB would be about that on 8b so that makes sense.

There are 9dB snr profiles out there, very rarely are they seen on lines though and the cause of them showing up isnt pretty lacking on details - partly because they are so uncommon.




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  # 1251572 5-Mar-2015 11:11
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nice to know thanks

'That VDSL Cat'
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  # 1251576 5-Mar-2015 11:19
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To give you some more exact figures, dug up the screenshots of my old 8b line that i had running at 9dB 44Mbit and 38Mbit at 12dB

that was a on a dodgy line so not the most accurate of tests, 9dB attenuation. DLM-2




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  # 1251904 5-Mar-2015 19:31
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well least it didn't drop 10Mbps like mine did 

'That VDSL Cat'
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  # 1251944 5-Mar-2015 20:41
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Athlonite: well least it didn't drop 10Mbps like mine did 


i too had this experience.






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Master Geek
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  # 1256746 12-Mar-2015 02:33
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Something interesting happened last night, my DLM profile changed to one with no interleaving.... was getting 31 ping to an australian game server, so no complaints haha. Did DLM crash or something? Was previously on 8/4 delay


'That VDSL Cat'
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  # 1256747 12-Mar-2015 02:34
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Looks like DLM-1.

interesting to see your sitting on annexB.




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Master Geek
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  # 1256748 12-Mar-2015 02:36
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hio77: Looks like DLM-1.

interesting to see your sitting on annexB.


Been on Annex B since I got connected, this is a screenshot from feb 3rd 2015. I'm assuming DLM-1 won't last and I'll be kicked back to my old DLM soon enough.


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Ultimate Geek
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  # 1257340 12-Mar-2015 17:42
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hio77: interesting to see your sitting on annexB.

Mine has been on annex B since being moved to a Broadcom based line card. When I was connected to an Ikanos one it'd sync on Annex A.


'That VDSL Cat'
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  # 1257342 12-Mar-2015 17:44
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Lorenceo:
hio77: interesting to see your sitting on annexB.

Mine has been on annex B since being moved to a Broadcom based line card. When I was connected to an Ikanos one it'd sync on Annex A.



Yeah i recalled your was the same, Its interesting none the less, from the point of view of the slight changes to the spectrum.  




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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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  # 1264612 21-Mar-2015 15:51
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Yo homies :D  It's been a while!

Looks like the thread is still going pretty strong!  Good work! :D

I'm actually back to ask a question I can't recall the answer to!  Do we know what the min error rate is for moving to DLM-1?  I got dropped to DLM-2 recently after an odd bout of massive errors and it's been 3 weeks and I've not been put back on DLM-1 as yet...

If we did know this rate, I foolishly didn't put it on the front page.

Assistance for my ailing memory would be most appreciated :)

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  # 1264614 21-Mar-2015 15:53
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SamF: Yo homies :D  It's been a while!

Looks like the thread is still going pretty strong!  Good work! :D

I'm actually back to ask a question I can't recall the answer to!  Do we know what the min error rate is for moving to DLM-1?  I got dropped to DLM-2 recently after an odd bout of massive errors and it's been 3 weeks and I've not been put back on DLM-1 as yet...

If we did know this rate, I foolishly didn't put it on the front page.

Assistance for my ailing memory would be most appreciated :)


nice to see you back :)

somewhere around the mark of under 6CRCPM normally drops you down.

when i was holding my DLM-2 profile to stay solid, i pegged it up so it would sit at 9CRCPM and not fall down to DLM-1 at all.




#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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  # 1264618 21-Mar-2015 16:02
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Hmm, I'm currently sitting at round 2 CPCPM...

That said, I didn't bother dropping my SNRM tweak this time.  Maybe that has something to do with it.  SNRM is currently 8.



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