It's adapted to the new conditions. The noise is gradually coming down, but the line rate is still at 5500 - no doubt it will recover eventually.Strange why the line rate went down and the noise went up after the glitch
It's not strange at all. It's perfectly normal and is how things work. If the noise margin goes up, your speed is going to go down.Strange why the line rate went down and the noise went up after the glitch
I'm assuming that ADSL works the same way as VDSL here. As the speed increases the noise margin decreases and so the error rate rises. The ends of the link negotiate the data rate up or down until the noise margin reaches an allowed value.(This all sounds the wrong way around to me. Shouldn't a higher noise margin be better?)
No, I'm not.You're confusing cause and effect.
Yes. But what happens if you get a burst of noise that overwhelms your existing margin? The answer is that the margin increases to the next band to try and protect against the extra noise. This results in a speed drop, because you have traded speed for resilience.The speed is gradually increased until the noise margin drops to a particular level.
Better for what? Speed or resilience?Shouldn't a higher noise margin be better?
I've no experience of ADSL as it was never an option here on 6.5km of copper. So I started a bit of research and soon found this:Oh yes, I see the point now, but that raises another question: why isn't my line rate training up and bringing the noise margin down to 3dB instead of sticking around at >6dB?
But you can achieve near enough the same result by putting [the] HH4 or other ISP-supplied router on it's own subnet and point your router's WAN port at it. It's what I've done here and means all my network settings are in my router (currently a it's a Netgear DGND3700v2) and not the BT Smart hub.Unfortunately the HH4 is so locked down it can't be used as a modem only and connected to the Netgear's WAN input (according to the relevant forums).
Not sure you can turn off the WiFi (and the public WiFi) though.But you can achieve near enough the same result by putting [the] HH4 or other ISP-supplied router on it's own subnet and point your router's WAN port at it.
I think that's the same one.currently a it's a Netgear DGND3700v2