I'm not trying to be funny. I'm just trying to be realistic.
If William had been uploading for longer we would know what would be normal for his line.
Whilst it is apparent that his line is noisy. We must bear in mind that 'Glen' already did line checks and confirmed the line was ok and of good quality.
BT expects variance in SNRmargin - in fact DSL technology is built to expect variance and anything up to 3dB is considered 'normal'.
It is precisely why things like FEC, Interleaving, INP and now G.INP was invented - to protect against this noise.
Unless there is a voice affecting fault then what can BT do?
I suspect it may be low level HR fault, which may in time develop into something more serious, but in the meantime HR faults are extremely difficult to track down. FACT.
Look at my stats below - Note the variance of 24dB on the upstream. I had about a dozen visits by about 8 different engineers and none of them could track it down until voice was impacted extremely badly. The line was dropping out totally each time the phone rang and I had large amount of tones in the D1 band where there was hardly any bit loading.
My upstream got banded at 10Mbps at one point and you can see from the graph that my upstream attainable was varying between 37Mbps to 10Mbps. BT really dont give a rats bottom about upstream. You can see that my downstream SNRm was also dropping from 12dB to 0dB when the phone rang.
It took me 2 months to get that fixed and I found it quite stressful, so what is trying to get a 2dB variance fixed going to do for William.
If William hadnt messed with his line & DLM to get himself banded, then g.inp would still be on that line taking care of the errors and he wouldnt be any the wiser.
Now that he has interleaving, that now puts him ILQ green. ILQ green is good. ILQ amber is OK.
What REALLY concerns me, is that one of the visiting engineers implied I was getting hooked up on line stats, because I showed him the graphs below... so in all honesty what has William got to go on, other than a 2dB variance.. and how far is that going to get him when DLM is now ILQ green.
It also concerns me that some BT boffins are aware of how easy it is to get hooked on line stats and that some will go into acute state of worry for what is normal parameters. Ringing any bells? Is it any wonder why certain ISPs lock their routers so that such info unnecessarily panics their users, Ive seen William get anxious at a 0.1dB change.
If I thought for one minute there was an audible voice fault, then I would be backing him all the way... but without that what are the realistic chances of BT being able to track it down without weeks of ping-pong.
The sad fact is, if there is a small HR fault as I suspect there may be, we should know by now that it is exceedingly hard to fix.
... and here are us sat waiting for a train crash to occur.
Yes there does appear to be a problem with banding, and I will try and get some further clarification on this... but the fact remains if William hadnt messed then g.inp would still be sat there doing its thing keeping his line stable.
The only reason I backed him last week is trying to get rid of the banding by getting a reset. So the banding has gone, but his line is still now with interleaving in a slightly better state than it was when he first got the upgrade. As he's now syncing at 37.5 Mbps.
G.INP needs to get back on that line, perhaps in time it will. Im not saying when it will be though, because thats where my doubts lay. We've seen some on here say it's taken about 5 days.
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ETA
Oops I forgot to add the stats.
