Since the audience of this thread might be interested in that as well:
https://forum.openwrt.org/t/simple-tool-to-query-lantiq-modem-statistics-and-diagnostics-useful-for-modem-routers-running-openwrts-dsl-cmd/53857
Might be helpful to get Bitloading, SNR, H(log) and QLN plots out of lantiq modems under OpenWrt...
Sorry for the distraction.