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[olwalh]

I have spoken again to BT who claim that my router is faulty (Billion 8900AX-2400). Everything was fine until yesterday when I suffered 3 resync's in a few minutes, reason code 1 then 4 then 1. Tonight I suffered 5 within a few minutes reason code 0 then 1 then 1 then 4 then 1 again. I am on MyDSLWeb stats (olwalh) if someone who unstandards more about these things could have have a quick look I would be greatfull. Yesterday BT said there was nothing wrong, today there is nothing wrong with the line but the router could be faulty.

[burakkucat]

The normal response by the typical first line support entity is to categorically insist that the problem originates elsewhere. ("No, it cannot possibly be due to the physical infrastructure of the circuit . . . It has to be the end-user's modem/router."  )

I have taken a look and my initial response to your circuit's SNRM plot is "Yuck!"

I see nothing as to the origin of the problem, at the moment. We must watch and wait.

Have you performed a Quiet Line Test, with a wired telephone directly connected to the test socket of the NTE5/A? If yes, was there anything audible?

daveesh1 speculates that your circuit may be showing similar symptoms to that of his own. I think it is currently too early to form any conclusion.

[olwalh]

I ran the quite line test, I did not hear anything. I swapped the Billion 8900AX-2400 for the unlocked HG-612 however I am still seeing regular disconnections.
BT customer support have been, as expected, useless. The problem started at ~11 on Tuesday the 24th at or around the same time as the US SNRm crashed.

[WWWombat]

Once again, we seem to see an increase in attenuation as one of the symptoms.

This is weird - three in a week, showing signs I've not seen before.

[burakkucat]

Once again, we seem to see an increase in attenuation as one of the symptoms.

This is weird - three in a week, showing signs I've not seen before.

Yes, very weird. 

(I am also sensing a minor tingling in my whiskers but, so far, it has not developed into something that I could "put a paw onto".)

[olwalh]

So after several weeks of stable operations, this morning (shortly after 8am) there was a deduction in both US and DS SNRM (from 6.8db to 5.5db). Nothing has changed at my end. Are such sudden deductions in SNRM normal.

[WWWombat]

A new FTTC subscriber causes new signals in the shared cables, which inject noise into existing subscribers. This is known as crosstalk.

The usual sign of one of your neighbours signing up to FTTC can indeed be a drop in SNRM, and it can be more severe than 1.3dB.

[William Grimsley]

To be honest, I know this is a forum, but it sounds like the infrastructure is starting to fall apart!

[olwalh]

A new FTTC subscriber causes new signals in the shared cables, which inject noise into existing subscribers. This is known as crosstalk.

The usual sign of one of your neighbours signing up to FTTC can indeed be a drop in SNRM, and it can be more severe than 1.3dB.

Thanks, I guess that is route cause.