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[j0hn]

interesting its only circa 500 on hauwei interleaving vs 1000+ on eci?

No.
The Interleaving depth is directly proportional to the sync speed.

Your sync is over double that user therefore your Interleaving depth is much higher.

If you cap your downstream to 30Mb with Interleaving on it would be very similar.

[tiffy]

After 4 days of complete stability on my line since my close neighbours fault was repaired on Wednesday, I believe I can now declare the case as closed.
Still remain on DS G.Inp Re-Tx high profile but I'am sure that will revert to my normal Re-Tx low soon, either at the next manual re-synch or via DLM intervention.

While appreciating that copper/alu. pair crosstalk within a distribution cable can & does have quite a considerable effect on line speed and noise, interaction being proportionately greater at the higher VDSL tone frequencies, I would not have believed the extent of, in my case, US only disruption caused to my VDSL service from a fault on an adjacent VDSL line.

Thanks to DSLStats the complete scenario has been recorded/documented and will hopefully assist diagnosis of any similar situations that could occur in the future.

I still use a SamKnows WhiteBox on my line which has been very useful with longer term data speed trending and providing historical evidence to ISP's who are reluctant to believe the existance of or action faults, not that this did any good with Plusnet !

Thanks to all who showed interest/offered support with this issue, now hopefully resolved.       

[burakkucat]

It is good to know that all now appears to be well.

[tiffy]

Yes indeed 

Apologies if I sound bitter but absolutely no thanks to my ISP..

Many thanks for your help and support.

[burakkucat]

Apologies if I sound bitter but absolutely no thanks to my ISP..

No apologies were/are required. 

[tiffy]

Bad news, by lines US SNRM oscillations have returned with associated US ES rate increase.
Was rock solid for a week since OR fixed my neighbours BB issue, just re-appeared yesterday afternoon, not just as bad as the original issue with respect to US SNRM oscillation amplitude and US error rates but certainly worrying.

My neighbour who was the source of the original trouble thinks his lines performance may have deteriorated slightly, have asked him to carry out and log some speed tests, difficult to be definitive as he uses a BT issue modem/router box with Wi-Fi connections and has never carried out any speed testing.

Will try to get him to power down his modem/router for a short period of time while I monitor my line stat's to establish if the interference source is definately from his line, unless he is actually experiencing drop outs it will be difficult to get OR back again I would think.

Attached DSLStats SNRM & ES graphs showing the onset of the upset.

[burakkucat]

Ouch! 

I really cannot think of anything else you could try. The testing, with your neighbour's cooperation, will give some further information.

[tiffy]

My current US SNRM cycle is still there, see attached graph.
US ES rates are still high (for my line) avg. 340/day, normally 3/4 max..
Likely not enough to trigger DLM action, just annoying.
Can't tell if any U1 band noise would show up on HLog & QLN graphs as was the case previously, not had a re-synch, reluctant to manualy re-synch as would very likely loose quite a bit of US synch speed with the noise active.

My neighbour who was the source of my previous noise issue, agreed to power down his BT HH-3A today for half an hour, unfortunately, this produced no change to my US SNRM oscillations, looks like this is not the root cause this time.
His US & DS data speeds are considerably slower that my line (we are less than 20 yards apart) however, he has not noticed any significant degredation to his service since OR repaired on 15/04.

If I do have a further line cross talk issue will just have to hope that it's bad enough to be noticed by the party involved and will prompt investigation from their ISP..

[burakkucat]

I do not have anything further to suggest . . . 

[tiffy]

I do not have anything further to suggest . . . 

Many thanks for your interest and support, much appreciated.

Yes, I may be completely "barking up the wrong tree" with this latest incident, it just bears so many similarities (but on a smaller scale) to the original incident.
I'am very interested to see at the next re-synch if the noise shows up on the QLN & HLog, U1 band as it did before, if so that will convince me that the issue is cross talk related as was the case previously.

[tiffy]

After 7 days and with no re-synch's on my line the US SNRM oscillation and associated US errors have gone away again !

I believe the time of this occurance may be significant, 02:00 hrs. this morning, from past experiences, a common time for DLM action to occur.
Perhaps a "disturber" on my DSLAM/local cable has had a re-synch ?
To clarify, my line has not re-synch'ed.

My immediate neighbour, the source of my previous issues, would not really know if his line re-synch'ed this morning as he runs a BT HUB 3B and never monitors the very basic line stat's available.

Attached, DSLStats snapshots of the event.

[burakkucat]

It's good to know that the problem has ceased. The initiation of the problem remains a mystery . . .

[tiffy]

It's good to know that the problem has ceased. The initiation of the problem remains a mystery . . .

Yes indeed, was happier with the previous solution as a definate cause was established, an issue that goes away for no known reason will very likely reappear again at some stage !

I'am still convinced that the issue is cross talk, cable related interference from another user rather than any form of REIN as the US SNRM oscillation pattern when present is so regular.