I have been told there is no issue on my line by second line support, but the upload modulation jumping says otherwise (from 64QAM to 32QAM). Download is fine, upload is not. Tested on a CAT6 cable, with a gigabit network card.
Samknows Real Speed shows around 24Mb coming to the router.
I have tested on different devices, with different cables, multiple router resets, different times of the day, ensured coax connections are tight inside and out and tested with and without the attenuator fitted to my line.
I will post router info below.
Please could somebody confirm if I have an issue here, thanks.