engineer has been this morning. Not faults on the line or noise !. they have done a profile reset in the cab to 80/20 but he said i would have to wait 10 days for line training if this does not fix a swap around in the cab would be needed. am i right in thinking that the attainable rate should not of moved from 88/30 its now currently 46/19 and this is this issue not the sync speed

Did your modem re-sync when he did that?

they did two resyncs on the line but the attainable rate has not moved which makes me think its the cab. does the attainable rate need to retrain as well or should that be a given on the line ? no the modem and line are still operating around 45/19 just like when the issue first occured

What are your current SNRM levels?

If they are not much higher than 6dB, they would be way too low for any higher speed (sync or attainable), suggesting a physical line problem (or a speed "cap" has been implemented for some reason).

Also, from xdslcmd info --pbParams, has there been any change in attenuation levels per DS & US band plan? (assuming you have been noting them).

Edited by Bald_Eagle1 (Sun 24-Jun-12 11:18:40)

I believe the attainable rate is just a calculation made by the modem based on the attenuations/noise levels/noise margin and currrent sync. Did the sync speeds change significantly?

[IMG]http://i713.photobucket.com/albums/ww132/truex360/li...[/IMG]

just run now after engineer visit he did test the line for all faults but they passed e.g. noise etc

before issue

[IMG]http://i713.photobucket.com/albums/ww132/truex360/mo...[/IMG]

just after engineer visit today

[IMG]http://i713.photobucket.com/albums/ww132/truex360/23...[/IMG]

I meant did the modem resync when the engineer fixed the profile. If it didn't, then you need to resync it yourself.

Your SNR graph seems to have really low values compared to your Hlog (attenuation) which looks really good.

Low SNR graph values seem to suggest a noisy connection.

Even my poor connection has higher values in the SNR graph than yours.

Do you have an older SNR graph for comparison?

It COULD just be a massive change in crosstalk ???

Edited by Bald_Eagle1 (Sun 24-Jun-12 15:00:45)

i haven't got my graphs from when i first went onto 80/20 only the modem page (above) showing full sync. The engineer was in agreement that something was wrong as the cab is just around corner he had profile reset but he did say something about a move within the cab if this did not work. the only thing i can see that has change is my neighbors had a new line installed . but would cross talk half a line ??? as my predicted speed on btw website was 67.5