Lack of support from Plusnet

[#1]

Thanks James, Jack.

[#2]

Hi James,
                Don't know what is happening but at 12.36 my computer powered down and powered back up with a SNRM of 6dB, it then powered down again and I switched it off as I wasn't sure what was happening (thought maybe mains electric going off). Just powered back up again and SNRM gone back to 9dB, any ideas?, Jack.

[#3]

Erm, no!
To be honeswt I have absolutely no idea why that would have happened 😕

[#4]

So, where do we go from here?

[#5]

Can you try rebooting your router first thing tomorrow morning?
It may just be that there's too much noise on your line for a 6dB profile.  Unless you'd managed to test that out using dmt?

[#6]

I've been running the quiet test on 17070 frequently over the last 2 weeks and it's always very clean, last one 10 mins. ago, silent.
Will try a reboot in the morning but not hopeful, I forced my SRN to 6dB last week and it ran for 24 hours without a problem, Jack.

[#7]

Have just used DMT to force a SNR of 6dB and it's runing happily at 6.2dB and a through speed of 7200, will leave it and see what happens, Jack.

[#8]

At 9.30 pm BT again reset my SNRM to6dB and at the moment it is running OK, fingers crossed, Jack.

[#9]

I really can't understand what is happening, again it's shot up to 10.6dB, for 6 hours before BT's last reset to 6dB (at 9.30) it had been forced to 6dB on DMT and ran without a problem, as soon as BT set it to 6dB it goes haywire, has anyone got an idea as this line previously ran at 6dB without any drops or problems, Jack.

[#10]

Hi Jack,
the fact that your computer powered down, presumeably due to a mains interuption, means your router will have done the same. I have come across these strange occurrances where the Target SNRM "seems" to be different from what it was immediately previous. A subsequent reboot returns it to the level it was before.
I would not assume that the change at 1236 was anything to do with the request to BT, certainly as this would seem to be somewhat sooner than would normally be anticipated and happened at a power dip. When the Target is reset, a resync will occur automatically, there should no need to do a re-boot, in fact I would not recommend it.
As I was typing this reply I've just seen your two.
Check your phone line for audible noise.
I would leave RouterStats running when you can just to monitor the situation for a while, and see what errors are occuring and when perhaps.
Edit: Has the sync rate changed since 2130?

[#11]

What sort of noise variations is either DMT or RouterStats currently showing? Has there been a sudden spurt in errors?

[#12]

Hi Chris
              The change at 12.36 was BT resetting the SNRM as I got an answer from CSC telling me it had been done. I've checked for noise using 17070 several times today and it's always very clean, when I forced the SNR to 6dB using DMT I wasn't running Routerstats and it was solid, just realised that as soon as I ran it again is when the problems started so I think I'll leave it off for now, the problem is that BT are not going to want to keep resetting are they?
Just to clarify that when the computer rebooted it was not a power cut as nothing else was affected and the computer would not reboot after a mains cut would it?, regards, Jack.

[#13]

Just saw your post no change it errors pretty much as normal, DMT did show a spike when BT reset this evening.
adie:quote

[#14]

Unfortunately your post this morning left the impression the computer reboot was a mains dip, and yes a dip could cause a reboot, what happens after a longer break may depend on the settings you have on your computer.
Why your computer should reboot just because of a resync associated with at Target SNRM reset, I don't know!
Can you post a DMT snapshot when you've got enough of a plot on the noise graph.
Just out of curiosity which router are you using at the moment. Could you also post asa your downstream and upstream sync, Attenuation & snrm.
Cheers.

[#15]

Hi Chris,
              The router I'm using at the moment is Voyager 2110.
I'll start DMT now and give you a screenshot later.
Here are my router stats for now,
 
Line Mode G.DMT  Line State Show Time 
Latency Type Interleave  Line Up Time 00:01:06:26 
Line Coding Trellis On  Line Up Count 4 
 
Statistics Downstream Upstream 
Line Rate 5696 Kbps 448 Kbps 
Noise Margin 10.4 dB 11.0 dB 
Line Attenuation 36.0 dB 19.5 dB 
Output Power 19.8 dBm 12.5 dBm 
K (number of bytes in DMT frame) 179 15 
R (number of check bytes in RS code word) 12 4 
S (RS code word size in DMT frame) 1 4 
D (interleaver depth) 32 8 
Super Frames 234481  234479 
Super Frame Errors 1  0 
RS Words 15944732  3986143 
RS Correctable Errors 1503  0 
RS Uncorrectable Errors 32  0 
HEC Errors 1  0 
OCD Errors 0  0 
LCD Errors 0  0 
ES Errors 0  0