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[roseway]

Thanks for that information. I'll still try to handle it a bit more gracefully.

I'm not sure if the sometime absence of the upstream SNR is actually a router bug or intended behaviour. I have the same situation with my HG612 and I've tried to work out what causes the presence or absence of the upstream SNR. I get the impression that the upstream data only appears when the peak SNR exceeds 50 dB, which in my case isn't very often.

[ColinS]

I believe this is the HG612's limit before resetting stats (e.g. RSCorr/FEC errors) back to zero:-

2^32 or 4,294,967,296

That seems a huge cumulative total, but I have seen it exceeded within much less than 24 hours on a number of connections, particularly when a HG612 is connected to an ECI VDSL2 DSLAM.

Like this you mean? 

Looking back at the sorts of error rates I was getting around the time I asked Eric the question, I see that on 09/06 alone I had FEC error-rates of ~8*10^7/min for 10hrs.
i.e. 10*60*8*10^7 = 4,800,000,000 > 2^31 = 2,147,483,648 and even > 2^32 = 4,294,967,296 

So, at the time, my line was doing things that no-one, not Eric or me, would have anticipated it might! 

[roseway]

My tones plot graph is constantly re-scaling back and fro between samples
So on one sample the LHS scale is up to 22 bits and the RH up to 66 SNR
Then at a next sample the scale swaps to 24 bits/72 SNR as a max on the scale (max SNR is actually 19
and so on - its not changing every single time methinks but is does quite a bit, so the whole graph is moving from sample to sample.

A follow-up on this: I've realised that when I changed the proportionality between the bits and the SNR on that graph I didn't change the autoscaling to match the new proportions. So the graph rescales unnecessarily when the SNR exceeds 50. I've now corrected this, and the next version shouldn't exhibit the irritating behaviour.