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313 posts

Ultimate Geek
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Topic # 138855 19-Jan-2014 15:50 Send private message

Anyone else notice that after an area wide power cut their sync rate goes up significantly?  Makes sense as most peoples modems would be off so SNR would be low until they had all powered up.

Would be interesting to get a modem on a UPS and resync in the middle of a power cut then see what difference it made and then if the rate was sustainable.  My experience is that the line stays up and stable albeit with a jump in HEC errors.

For reference my "normal" DS is around 35Mbit/s but after the last two power cuts, jumped to 44 and 39Mbit/s.  

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  Reply # 969680 19-Jan-2014 15:57 Send private message

Yep, happened to me recently. Higher sync lasted about 1 week, then re synced back to usual.




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  Reply # 969717 19-Jan-2014 18:12 Send private message

maybe because you went to a different DLM upon re-sync?

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  Reply # 969753 19-Jan-2014 21:41 Send private message

Jase2985: maybe because you went to a different DLM upon re-sync?

Most likely yes, as my error rate would have gone up. My line was sitting on 4dB noise margin!




Chorus has spent $1.4 billion on making their ADSL broadband network faster. Why not spend a couple of hundred to make sure you are getting the most out of your connection?
Geekzone special price: $150* for master splitter install, normally $200+ through your ISP. Auckland and Waikato areas.
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  Reply # 969840 20-Jan-2014 09:04 Send private message

coffeebaron:
Jase2985: maybe because you went to a different DLM upon re-sync?

Most likely yes, as my error rate would have gone up. My line was sitting on 4dB noise margin!

Surprising it would make such a difference. I think there is a large amount of noise and interference in my area given my SL distance and synch rates.




 


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  Reply # 969859 20-Jan-2014 09:21 Send private message

There have been a number of reports of this before.

I don't think it was DLM in the other cases (do you know what your interleaving\INP was before and after the power cut? :) ) - DLM changes usually seem occur at around 4am or a little after. They can occur at other times by it seems very infrequent.

My suggestion in the past was that maybe if your modem reconnects "quickly" before most other people, then there is less crosstalk, hence syncs higher - this might also be why the SNR Margin seems a bit lower afterwards. I think at the time someone in the know put the kibosh on this idea though...?

Still curious what might cause it though as a number of people including myself have observed it in the past when there has been a powercut. Maybe it's less interference from all electric items (in houses + streetlamps,etc)?

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  Reply # 969878 20-Jan-2014 09:48 Send private message

sidefx: Still curious what might cause it though as a number of people including myself have observed it in the past when there has been a powercut. Maybe it's less interference from all electric items (in houses + streetlamps,etc)?


Definitely the case, I would like to be able to do real world tests. See how big of a difference it is.




 




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  Reply # 969881 20-Jan-2014 09:57 Send private message

sidefx: There have been a number of reports of this before.

I don't think it was DLM in the other cases (do you know what your interleaving\INP was before and after the power cut? :) ) - DLM changes usually seem occur at around 4am or a little after. They can occur at other times by it seems very infrequent.

My suggestion in the past was that maybe if your modem reconnects "quickly" before most other people, then there is less crosstalk, hence syncs higher - this might also be why the SNR Margin seems a bit lower afterwards. I think at the time someone in the know put the kibosh on this idea though...?

Still curious what might cause it though as a number of people including myself have observed it in the past when there has been a powercut. Maybe it's less interference from all electric items (in houses + streetlamps,etc)?


I think @Jase2985 was referring to DLM triggering the resync that returns the line to "normal".  After the initial training period changes are supposed to be weekly.

FWIW.  I'm on day 11 of 39.4Mbit/s (Noise margin 9.6), so in theory I've survived at least one opportunity for DLM to resync my line.  Have been on profile 1 the whole time.  Can't remember how long I lasted at 44Mbit/s but it was at least a few days and only reset because I needed to disconnect the modem for some recabling.

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  Reply # 969905 20-Jan-2014 10:44 Send private message

hashbrown:I'm on day 11 of 39.4Mbit/s (Noise margin 9.6), so in theory I've survived at least one opportunity for DLM to resync my line.  Have been on profile 1 the whole time.  Can't remember how long I lasted at 44Mbit/s but it was at least a few days and only reset because I needed to disconnect the modem for some recabling.


What was throughput vs. sync? Increased ping times or lower?




 




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  Reply # 969936 20-Jan-2014 11:20 Send private message

TimA: What was throughput vs. sync? Increased ping times or lower?


I didn't keep any stats from when I was at 44Mbit, but I was able to get >40Mbit/s throughput. Wouldn't expect ping to go up unless the DLM profile changed.

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  Reply # 970017 20-Jan-2014 14:27 One person supports this post Send private message

sidefx: There have been a number of reports of this before.

I don't think it was DLM in the other cases (do you know what your interleaving\INP was before and after the power cut? :) ) - DLM changes usually seem occur at around 4am or a little after. They can occur at other times by it seems very infrequent.

My suggestion in the past was that maybe if your modem reconnects "quickly" before most other people, then there is less crosstalk, hence syncs higher - this might also be why the SNR Margin seems a bit lower afterwards. I think at the time someone in the know put the kibosh on this idea though...?

Still curious what might cause it though as a number of people including myself have observed it in the past when there has been a powercut. Maybe it's less interference from all electric items (in houses + streetlamps,etc)?

I have had the same with ADSL2. I have UPS, so restarted router during the power cut. Sync increased significantly. It then stayed connected at the higher speed, but obviously was more prone to errors. If I had manually rebooted at anytime, sync would have gone back to normal. Instead DLM finially caught up with me and said, hey your line sucks, let me change your profile! The good times ended :(




Chorus has spent $1.4 billion on making their ADSL broadband network faster. Why not spend a couple of hundred to make sure you are getting the most out of your connection?
Geekzone special price: $150* for master splitter install, normally $200+ through your ISP. Auckland and Waikato areas.
*Travel charges may apply. Additional costs may apply for complex installs.
I install - Naked DSL, DSL Master Splitters, VoIP, RBI Rural Broadband. Also a dealer for WorldxChange.
Need help in Auckland or Waikato? Click my email button, or email me direct: [my user name] at geekzonemail dot com

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  Reply # 970261 20-Jan-2014 20:11 Send private message

If you are with Telecom I may be able to find out if any dlm shizzle had gone on.




I work for Spark, but as always my views are my own.

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  Reply # 990604 19-Feb-2014 16:39 Send private message

Before power cut:




After resetting during power cut on UPS




Image a little hard to read, but basically went from 14 Mbps to 21 Mbps downstream.




Chorus has spent $1.4 billion on making their ADSL broadband network faster. Why not spend a couple of hundred to make sure you are getting the most out of your connection?
Geekzone special price: $150* for master splitter install, normally $200+ through your ISP. Auckland and Waikato areas.
*Travel charges may apply. Additional costs may apply for complex installs.
I install - Naked DSL, DSL Master Splitters, VoIP, RBI Rural Broadband. Also a dealer for WorldxChange.
Need help in Auckland or Waikato? Click my email button, or email me direct: [my user name] at geekzonemail dot com

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