Any ideas what's going on with these graphs?

My broadband woes continue. As winter approaches my broadband suffers, normally I'd start to have problems from around November onwards but this time I've started to get problems from around July time.

I've always had a lot of background noise on the telephone line, so much so that the handset has been disconnected for well over the last year as you just couldn't hear anybody plus using the handset would cause the connection to drop. It's taken me from July to Wednesday just gone to get a BT engineer in to have a look, his quiet line test failed and he found a line fault from the green box back to the exchange and swapped over the conductors I use. The noise on the line has now gone, whilst the engineer was there the broadband looked fine so he left but later in the day I started to get problems.

Talktalks answer is just keep on raising the SNR margin which does nothing, I'm currently on a 15db profile but I still get graphs like the ones attached.

Talktalk don't seem to be interested in anything except increasing the noise margins but the real problem with the line is still there. One thing I have noticed is that it is definitely the upstream connection that's dropping first, this in turn seems to pull the entire connection down.

To date I've replaced the router, have had the faceplate replaced, replaced the telephone handset, I only have the single socket with just the router and handset connected. If anybody can offer any advice I'd really appreciate it.

http://img.photobucket.com/albums/v280/IAmATeaf/sync...
http://img.photobucket.com/albums/v280/IAmATeaf/sync...
http://img.photobucket.com/albums/v280/IAmATeaf/snr-...
http://img.photobucket.com/albums/v280/IAmATeaf/snr-...

The graphs

How is the quiet line test now, (17070 option 2), using a corded phone into the test socket, (not the external socket on the master)?

If that is clear, what is it like with everything connected normally?

Is your central heating running earlier this year, with the weather we have been having?

(Edit - and you are on a 6dB downstream noise margin and seemingly 8dB upstream)

Edited by RobertoS (Fri 09-Sep-11 09:25:32)

Apart from a very low constant background hum there is none of the crackling and popping that used to be there, I've tried this from the main master socket and via the faceplate.

No, I've not been using the CH, haven't turned it on yet.

My snr margin or profile was changed to 15db last night and according to TT the line is now stable but when using the internet I get pauses which coincide with the most recent graph traces I've just done.

Surely the snr jumping around that much can't be normal can it? Also on the snr graphs the lines are black and red, whenever the line goes red I have no interent till the line goes back to black but TT say there are now no disconnects. Very frustrating.

http://img.photobucket.com/albums/v280/IAmATeaf/sync...
http://img.photobucket.com/albums/v280/IAmATeaf/sync...
http://img.photobucket.com/albums/v280/IAmATeaf/snr-...
http://img.photobucket.com/albums/v280/IAmATeaf/snr-...

In reply to a post by IAmATeaf:

Apart from a very low constant background hum there is none of the crackling and popping that used to be there, I've tried this from the main master socket and via the faceplate.

No, I've not been using the CH, haven't turned it on yet.

My snr margin or profile was changed to 15db last night and according to TT the line is now stable but when using the internet I get pauses which coincide with the most recent graph traces I've just done.

Surely the snr jumping around that much can't be normal can it? Also on the snr graphs the lines are black and red, whenever the line goes red I have no interent till the line goes back to black but TT say there are now no disconnects. Very frustrating.

http://img.photobucket.com/albums/v280/IAmATeaf/sync...
http://img.photobucket.com/albums/v280/IAmATeaf/sync...
http://img.photobucket.com/albums/v280/IAmATeaf/snr-...
http://img.photobucket.com/albums/v280/IAmATeaf/snr-...

No it should be more or less a straight line on SNR but some degree of fluctuation is normal , sync should be a continuous straight line

Evidence it's self of a possible fault as they have raised the target SNRM to 15db in a bid to hide the fault,

I get the impression that as they now class the line as stable they won't be willing to listen or do anything.

I have given them copies of the graphs.

I've told them that their solution is is bit like me taking my car to the garage and reporting that it cuts out at 50mph, the garages responds with the proposed fix that I should only drive at 30mph.

Ummm.

Comparing your first set of graphs with your second, note that in the first set the up and down sync's change with several of the disconnects. In the second the sync's are rock solid. That would tie in with them saying you are not getting disconnects on the higher margin.

I've no idea what I'm looking for here, but it seems to be something stopping the traffic but maintaining sync.

I'm a bit confused by the graph colours, I think it is full RouterStats, not Lite, which I know more about. However, on Lite the graph stays the normal colour, (black), through a disconnect, and when the down-spike is red it means the router was too busy doing its real job of transmission and error-correction to bother responding. Those red spikes rarely if ever had a flat bottom.

I think some full RS graphs are red to start with, and the uploads you've given us aren't easy to analyse for colour changes.There are obviously a lot though, which is suspicious unless that is the norm on your version. Are there any that don't change colour?

Other than that, I'm a bit stuck for now, but gut feel says it could be something at your end that we haven't thought of.

The router is a brand new Netgear DGN1000 which looking on the internet has it's fair share of users with problems, but then again that's the internet for you, I don't post when things are fine only when things go wrong so it's not surprising that I get loads of hits back about people with problems.

Is there any way that TT can tell why the line lost sync and which end let go? I have asked them but they say that all they can see is that it lost sync and not much else.

Edited by deleted (Fri 09-Sep-11 14:32:27)

I tried a different power supply for the router and tried a different modem to master socket cable but I still get the fluctuations.

Stupid question time, but is there any way I can confirm that the new modem may be faulty? I don't have a spare either to test with

Take it to a friend's and see if it plays up there as well, or works fine. Preferably someone on LLU so you don't completely screw their line if it is the router.

Edited by RobertoS (Fri 09-Sep-11 21:37:06)

To date I've replaced the router

?

(Edit - did you also replace the power supply to it with the new one, as it could be that failing).

Edited by RobertoS (Fri 09-Sep-11 21:39:12)