After removing the protective caps from both the cable and the ONT's port, align the connector using the distinct key or tab, and push it in until you hear a secure click. Once the optical connection is secure, the next step is to bridge the ONT to your wireless router. Compatible router: Verify that your router supports fiber optic input (look for an SFP or WAN port labeled. The fiber optic cable does not plug directly into a standard home router because the signal type must be translated. The fiber line terminates at the Optical Network Terminal (ONT), which is typically supplied and installed by the internet service provider.