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[Hudson]

I had been having a few problems with my line for a few months which finally resulted in BT fitting new copper from the green box, and also in the junction box in my flat. But since then i have been unable to get the speeds i used to have before the problems started.

So over the last few weeks i have been trawling the net trying to find out some information to try and help me resolve the problem.

I have been monitoring my sync and noise with router stats and at around 6-30/7-30am and 6-30/7-30pm my connection seems to try and resync, this is forcing me to be stuck with a 500k profile. I used to have a 1000k profile.



I don't get a lot of errors in a 24 hour period.

DownStream (RX Since Friday).

Noise Margin:     13.2   dB
Connection Rate:  800  Kbps
Line Attenuation: 63.5  dB
Power:            13.9  dBm
 
SF:               5366226
SF Errors:        722
Reed Solomon:     0
RS Corrected:     0
RS Un-Corrected:  0
HEC:              271
Errored Seconds:  3243
Severe ES:        73
Interleave Depth: 1


Upstream (TX since Friday)

Noise Margin:     14.0  dB
Connection Rate:  448   Kbps
Line Attenuation: 31.5  dB
Power:            12.1  dBm
 
SF:               5371770
SF Errors:        268
Reed Solomon:     0
RS Corrected:     0
RS Un-Corrected:  0
HEC:              116
Errored Seconds:  0
Severe ES:        0
Interleave Depth: 1


This a capture of tonights noise levels at 7pm




As above but  1 LOS and 9 LOF (this has happend on 3 occasions over the last few weeks) and resync




Not sure what happend here but noise level of 50db on a 5km line would be nice 





Any body gopt any ideas why i can no longer get a stable line (even though copper has been replaced), or even get speeds like i used to.



Thanks for any and all help

Hudson

[kitz]

Hi

>> Line Attenuation: 63.5  dB

Your actually on a very long line

>> Interleave Depth: 1

I'm surprised at that - long lines normal benefit from having interleaving applied so why the DLM hasnt turned it on for your line.


That first noise spike is very strange 50dB SNR Margin!!!  Ive no idea what all that is about looks more like mis-reporting unless someone else can come up with an idea.

The downwards spike at 19-15ish is more typical of a power spike - perhaps something being turned on at that time - street lighting, heating, electrical equipment either in your own home or close neighbour.

[Hudson]

Hi Kitz

Thanks for the reply, Interleave was turned off at my request months ago when the line was stable at 1mb.

Yeah i though that the noise spike might have been street lights but they do not switch on until 8pm, car park lights are at around 7-45pm.


My next door neighbour does not have this problem and runs at 1 mb.

[mr_chris]

Like kitz said, the 50dB upwards spike is undoubtedly a reporting error, probably a routerstats glitch.. depending on the way your router displays the SNR compared to everything else. Or the router being silly and reporting 50dB??

The downwards spikes - are they when the router resyncs? As you're aware I'm sure, given the length of your line it could be anything along the length, but you'd think it would affect your neighbour too if it was strong enough to cause such an impact on your line.

It's a bit of an odd one, can you think of ANYTHING at all in your house that switches on / off at those times?

[kitz]

>> Interleave was turned off at my request months ago when the line was stable at 1mb.

ahh - that explains that one

>> My next door neighbour does not have this problem and runs at 1 mb.

Anything in your own home that could cause it - certainly shows all the symptoms of a "flick of the switch".  heating, cooking, tv?

[edit]
Chris was posting at same time as me

[Hudson]

to answer both of you, there is nothing in my house that gets switched on at these times, heating is Eco 7 and switches on a 1am, TV is on from 5pm. Cooker is never on at these times. So nothing springs to mind at the moment but i will try and see if anything springs to mind.


Actually on the middle graph was Saturday evening, there was only me in the house playing on my x-box there was nothing switched on other than the fridge/freezer, TV, X-box. But on this ocassion it caused an LOS an 9 LOF


Also on all ocassions of the noise spike, i get a large jump in SF errors.

[kitz]

>> i get a large jump in SF errors.

Again typical of some sort of electromagnetic interference. :/

Although its not typical of full blown REIN, which is often when you would continue to see the errors rise whilst the offending item is switched on, this is impulse noise which occurs just whilst something is being switched on. - although I notice from the graph that errors seem to steadily accrue throughout the day.
Theres a list of common culprits on that page which were kindly provided by our "resident" Openreach engineer Ezzer whom on occasions specialises in REIN faults affecting BT lines.

[Hudson]

Cheers for that Kitz

So i need to get myself a AM/MW radio that tunes as high as 617Khz, and go searching within my aprtment to find the offending item.

[kitz]

That is one way of doing it and how some people find the culprit, however in your case it may be even more tricky since rather than being continuous for a while when the offending item is switched on, yours appears to happen fairly quickly then recovers. :/

[Hudson]

Cheers for the reply

That is one way of doing it

What is the other way ?


Just as i was typing this message, the error has happend at 5.46pm earlier than normal, so i went outside and there was no street lights on. So i think street lighting can be discounted.


Is it more than likely a fault with equipment within my apartment or from an outside (along the line) ?


Hudson

[oldfogy]

Actually on the middle graph was Saturday evening, there was only me in the house playing on my x-box there was nothing switched on other than the fridge/freezer,

fridge/freezer, can be one of the worst items for sending spikes on a system, but strange it happens at the same time each day. (unless I missed something)

[Hudson]

Hi Oldfogy 

Yeah you were spot on that the problem happend around the same time every evening, apart from today. I walk through the front door switch the TV on ,Sky sports news as Keegan might have been peddled. Went on the net to find some more information on the keegan situation and then it resync'ed.

So not really got a clue as to what's going on.

[jid]

Hi Oldfogy 

Yeah you were spot on that the problem happend around the same time every evening, apart from today. I walk through the front door switch the TV on ,Sky sports news as Keegan might have been peddled. Went on the net to find some more information on the keegan situation and then it resync'ed.

So not really got a clue as to what's going on.

Could be your Sky Box or your TV?

[Hudson]

Wish i had sky, Intergrated Freeview 

I had though that that may be the cause, but to no avail.


but i think i may have found the problem, in the car park there is bollard style car park lights See below.

http://i393.photobucket.com/albums/pp15/AzHudson/BollardLight.jpg

When i came home at about the time my noise increased tonight the below light was on and is not normally on that early.


But then again it could be anything in the below images.

http://i393.photobucket.com/albums/pp15/AzHudson/ElectricCuboard2.jpg


As you can see the BT junction box for all apartments  is just below the light, but directly oppposite


http://i393.photobucket.com/albums/pp15/AzHudson/Electriccuboard1.jpg

[oldfogy]

I see on your 2nd picture there is a "Time Clock"

Have you checked what the time/s are set for?


(As for the last picture, I didn't know you had taken a picture of my PC wiring set-up)