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Speed drop after power cuts - SNR reset required?

DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Speed drop after power cuts - SNR reset required?

Ever since I've had an ADSL2+ connection my line has synced at over 18Mbps and been very reliable.
However, we had several power cuts during the Christmas week and since then the sync speed has dropped to just over 16Mbps. It's a very reliable 16Mbps but it would be nice to get back to 18 again.
I realise that the frequent line drops caused by the power cuts may have made my connection appear unstable and that my IP Profile may well have been reduced as a result. But I was under the impression that once the line had proved itself stable again (and it had been synced at 16Mbps for over 500 hours) the IP Profile would increase again. So I rebooted the modem only to find that the speed remains at 16Mbps.
Looking at this forum, I see that others have had similar issues and the reason given for the problem is that a banded profile may have been applied and a SNR reset is required. I ran the BT Wholesale speed test and diagnostics which showed that my IP Profile is 14.31Mbps. Do I need a SNR reset and if so, how do I get it done?
Thanks for any help
David
13 REPLIES
Community Veteran
Posts: 38,460
Thanks: 1,031
Fixes: 62
Registered: ‎15-06-2007

Re: Speed drop after power cuts - SNR reset required?

Please provide your router stats as requested here http://community.plus.net/forum/index.php/topic,96155.0.html
DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Re: Speed drop after power cuts - SNR reset required?

Router stats, BT speed test and line speed details attached.
David
Community Veteran
Posts: 38,460
Thanks: 1,031
Fixes: 62
Registered: ‎15-06-2007

Re: Speed drop after power cuts - SNR reset required?

At a guess your default noise margin has increased from 3dB to 6dB
The automatic systems should eventually sort it but to do it quicker it would need the noise margin adjusted to 3dB but Plusnet would only do it if your line is now stable
Best thing it to wait for it to be picked up here
DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Re: Speed drop after power cuts - SNR reset required?

You are spot on - the noise margin did increase from 2 point something-or-other (as shown by the modem) and the line speed dropped accordingly. When I rebooted the modem this morning it was showing that the line had been synced at 16.4Mbps for over 500 hours. Would that count as stable? And how long do the automatic systems wait before dropping the noise margin (I was hoping that 500+ hours was long enough!).
Thanks for your help.
David
Community Veteran
Posts: 38,460
Thanks: 1,031
Fixes: 62
Registered: ‎15-06-2007

Re: Speed drop after power cuts - SNR reset required?

I have no idea about the automatic systems but it will probably be long enough for Plusnet to do it manually
DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Re: Speed drop after power cuts - SNR reset required?

Do I need to submit a request or will it get picked up here at a matter of course?
Community Veteran
Posts: 38,460
Thanks: 1,031
Fixes: 62
Registered: ‎15-06-2007

Re: Speed drop after power cuts - SNR reset required?

I would wait for it to be picked up here as the DCT have a much better handle on this
DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Re: Speed drop after power cuts - SNR reset required?

DCT ?Huh
Community Veteran
Posts: 38,460
Thanks: 1,031
Fixes: 62
Registered: ‎15-06-2007

Re: Speed drop after power cuts - SNR reset required?

Digital Care Team - the bunch of staff who post on here
DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Re: Speed drop after power cuts - SNR reset required?

Many thanks for your help, Jim.
David
Plusnet Alumni (retired) orbrey
Plusnet Alumni (retired)
Posts: 10,540
Registered: ‎18-07-2007

Re: Speed drop after power cuts - SNR reset required?

Hi there,
Just requested this for you, should take effect within the next few hours (around 4 or so I believe) - please let us know how it goes, hope it improves the speeds for you.
DavidJ
Grafter
Posts: 45
Registered: ‎30-07-2007

Re: Speed drop after power cuts - SNR reset required?

That did the trick - speed back up to 18Mbps.
Cheers
David
Plusnet Alumni (retired) orbrey
Plusnet Alumni (retired)
Posts: 10,540
Registered: ‎18-07-2007

Re: Speed drop after power cuts - SNR reset required?

Excellent, thanks for letting us know Smiley