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[burakkucat]

Hmm . . .

The Hlog plot of August 28th shows what we believe to be a bridging tap.

The Hlog plot of August 29th has the same underlying feature with added erratics. I speculate that intermittent contact to the circuit may perhaps be the origin. Intermittent contact by one or more wires that are either part of another working circuit or are "spares". 

[samwise78]

Thanks burakkucat

Haven't had a resync for a couple of hours now - and Hlog is looking slightly better but still afflicted.

Noted that DLM has upped the DS interleaving to 16 and backed of G.INP to 48 from 52, now looks more banded at exactly 60/20
The mysterious sky-high Zyxel FEC count has returned too after being conspicuously absent over the last couple of days.

I have another boost visit arranged for a week Thursday (must be busy) - wonder if the symptoms will clear up just in time for the visit 

Cheers
Sam

[burakkucat]

Both the Hlog and QLN pots are only updated at the time of a (re-)synchronisation event. They do not undergo a constant update process.

[samwise78]

Both the Hlog and QLN pots are only updated at the time of a (re-)synchronisation event. They do not undergo a constant update process.

Indeed, I am though comparing the view from my last resync around 4pm with the earlier screenshot from a resync around 1pm, attached for clarity

Thanks
Sam

[samwise78]

So, boost engineer visit is complete and I'm very happy with the results.
Guy was very thorough (3.5hrs on site) and ended up sorting it by completing a pair swap for me onto what he said was the only copper back to the cab, seems all my issues were due to being on 300m of aluminium.
Just going to leave things well alone now and wait for things to settle down DLM-wise after so many retrains this morning - new stats are up on MDWS for all to see have included before and after HLOG plots below..
Chuffed to bits

Cheers
Sam

[burakkucat]

Much better. That is a good result. 

[Edited to correct the spelling.]

[samwise78]

Much batter. That is a good result. 

It is amazing what a difference a good run of copper can make, I got lucky - am under no illusions there.
Big thanks to everyone who contributed to this thread, hoping I can draw a line under this now after a year!
Cheers
Sam

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[konrado5]

It is amazing that 300m of aluminium can make roll similar to bridge tap roll.

[samwise78]

It is amazing that 300m of aluminium can make roll similar to bridge tap roll.

I'm assuming the possible bridged tap still exists on that run of aluminium - but will happily defer to those better informed than me if it's an impossibility with aluminium..

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[burakkucat]

It is amazing that 300m of aluminium can make roll similar to bridge tap roll.

Indeed, yes. Previously, I would not have expected it but now we have seen the actual evidence.

(Of course there is still that slight abnormality visible at the high frequency end of the Hlog plot but that is best ignored. I don't think, under the circumstances, that the circuit could be improved any more.    )

[konrado5]

I think that this slight abnormality is caused by measurements errors. After one resynchronization event with target SNR margin 15 dB I had no slight abnormalities.

[samwise78]

Indeed, yes. Previously, I would not have expected it but now we have seen the actual evidence.

(Of course there is still that slight abnormality visible at the high frequency end of the Hlog plot but that is best ignored. I don't think, under the circumstances, that the circuit could be improved any more.    )

DLM should lower the interleaving depth and apply G.INP at a guess but am at almost maximum possible sync speed so I don't know..

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[burakkucat]

DLM should lower the interleaving depth and apply G.INP at a guess but am at almost maximum possible sync speed so I don't know..

The best course of action would be to just wait and keep watch. 

[Black Sheep]

I'm assuming the possible bridged tap still exists on that run of aluminium - but will happily defer to those better informed than me if it's an impossibility with aluminium..

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The 'Bridged tap' IMHO, is most likely a contact fault with a non-working pair.
If it was a working pair, there would be either a battery or earth fault ..... size of which would be dependant on the resistance between the two pairs. 

[samwise78]

G.INP was applied 2 days after the boost visit and all is now looking very rosy indeed.

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