What is the sync speed showing in your GUI "connection" tab ?
On a Thomson it should be 192.168.1.254 to access the GUI menu.
Download DMT to determine your attenuation and distance to CO, it will also tell you what your line is capable of.
Download version DMT v7.35 for Thomson modems. Don't worry you can select English when the program installs ...LoL
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dmt.mhilfe.de/