Follow the steps below to connect an USB modem.
Power on Abilis;
connect the modem to Abilis using the USB cable;
connect the VDSL line cable to modem;
add/configure the VDSL resource;
check the modem led status ( Abilis VDSL2).
Figure 3.9. Connecting an VDSL modem
Interesting chapters:
Section 2.9.4, “VDSL2 modem”;
Chapter 12, VDSL modem;
Section 72.9, “How to configure VDSL connections using USB modems”.