Which one is the fiber optic port on the router

Fiber optic connections to a router typically use an SFP port or a WAN/ONT port, often requiring an Optical Network Terminal (ONT) provided by your ISP.Connecting Fiber to a RouterMost consumer routers do not accept a fiber optic cable directly. Instead, the fiber line from your ISP usually terminates at an Optical Network Terminal (ONT), which converts the optical signal into an Ethernet signal that the router can use . The ONT is connected to the router via an Ethernet cable, plugged into the router's WAN port or a port labeled “Internet” .SFP PortsSome routers, especially business or high-end models, include SFP (Small Form-factor Pluggable) ports that can accept fiber optic modules. These ports allow direct fiber connections using compatible SFP or SFP+ modules . The fiber cable typically has an SC/APC or SC/UPC connector, which plugs into the SFP module rather than directly into the router .Key PointsConsumer routers: Usually connect to fiber via an ONT using the WAN port. Direct fiber input is uncommon .Routers with SFP ports: Can accept fiber modules directly, but the module must match the ISP's protocol (e.g., GPON, XGPON) and connector type .Port labeling: Look for labels such as “WAN,” “Internet,” “ONT,” or “Fiber” on the router to identify the correct port .Adapters: Standard SC-APC fiber cables cannot be directly converted to RJ-45 Ethernet without an ONT or compatible SFP module . In summary, the fiber optic port used on a router is either an SFP port for direct fiber connections or the WAN/Internet port when connecting through an ONT provided by your ISP. Always check your router's specifications and your ISP's instructions to ensure compatibility and proper setup.