Fiber optic internet transmits data as pulses of light through ultra-thin glass or plastic fibers, offering faster speeds, lower latency, and higher reliability than traditional copper cables . However, the light-based signal from the fiber cannot be interpreted directly by standard home routers, which are designed to handle electrical signals over Ethernet.
An ONT is a device provided by your ISP that converts the incoming optical signal into electrical signals compatible with your router . The fiber cable from the street or pole connects to the ONT, which then outputs data via an Ethernet port. This Ethernet connection is what you plug into your home router's WAN port to distribute internet throughout your home .
Some modern routers include SFP (Small Form-factor Pluggable) ports or are labeled as "fiber-ready," allowing them to accept fiber connections directly without a separate ONT . These routers are less common in typical home setups and are usually higher-end models designed for gigabit or multi-gigabit speeds. In most residential installations, the ONT remains necessary.
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