To set up your router for fiber internet quickly, connect the router to your fiber modem, access the router's settings via a web browser, and input the provided ISP credentials. As far as I understand, I need a PPPoE username and password to connect. I never received it from Telekom, as well as Access number (Zugangsnummer). The ONT is linked to your router or gateway using an Ethernet cable. * In some instances, the ONT. This guide walks you through the complete fiber installation process, from checking availability to optimizing your Wi-Fi network performance. With. Fiber optic technology represents a revolutionary advancement in connectivity, transmitting data via pulses of light through thin strands of glass or plastic fibers.