I have 40/20 fibre and so far it's been pretty good after a couple of intiial glitches. The TBB speed test has usually given something like 37Mb/s down, 18MBb/s up. In the last few days the down speed has dropped to around 15-20Mb/s though the up speed has remained around 18Mb/s. All these with a wired connection to the same PC.
I've just pulled out the old HG612 modem and PN router and fitted a TP-LINK TD-W9980. Speed test results unchanged. I can now see the connection stats:
Current Rate (Kbps) 19999 79997
Max Rate (Kbps) 26209 81464
SNR Margin (dB) 15.1 6.2
Line Attenuation (dB) 13.1 12.8
Errors (Pkts) 0 0
So there's clearly no trouble with the VDSL conenction. I understand that the 40/20 service is provisioned as 80/20 but throttled to 40/20 at PN.
What should I do next?