The fiber line terminates at the Optical Network Terminal (ONT), which is typically supplied and installed by the internet service provider. This specialized equipment serves as the demarcation point between the provider's optical network and your home network. Compatible router: Verify that your router supports fiber optic input (look for an SFP or WAN port labeled "ONT" or "Fiber"). Fiber optic cable: Typically a thin, yellow cable with. The fiber optic cable does not plug directly into a standard home router because the signal type must be translated. This. FiberOptic Internet, What it's made of. These aitelong fusion splicer fibers are grouped into.