Which cable on the router is fiber optic

The fiber optic cable is the one that connects from your ISP's fiber line into the Optical Network Terminal (ONT), not directly into the router.How to Identify the Fiber Optic CableConnection Path: In a typical home fiber setup, the fiber optic cable runs from the wall outlet or ISP entry point into the ONT. The ONT converts the optical signal into an electrical signal that your router can use. From the ONT, a standard Ethernet cable connects to the router's WAN port .Physical Appearance: Fiber optic cables are usually thin, often yellow, and have specialized connectors such as SC/APC or SC/UPC. They are made of glass or plastic fibers that transmit data via light pulses, unlike copper Ethernet cables which transmit electrical signals .Router Ports: Most home routers do not have a direct fiber input. If your router supports fiber, it will have a port labeled SFP, ONT, or Fiber, but in standard setups, the router only receives data via Ethernet from the ONT .Handling: Fiber connectors are sensitive to dirt and damage. Only handle the cable by its plastic housing and ensure protective caps are removed before connecting to the ONT .SummaryThe fiber optic cable is the one coming from your ISP into the ONT.The cable connecting the ONT to your router is usually a standard Ethernet cable.Look for a thin, yellow cable with SC/APC or SC/UPC connectors to identify the fiber line.The router itself typically does not connect directly to fiber unless it has a dedicated fiber port. By following these guidelines, you can clearly distinguish the fiber optic cable from other cables in your network setup .