Fiber optic cable connected to 100Mbps router

A 100 Mbps router can connect to a fiber optic internet line via an ONT, but your maximum speed will be limited to 100 Mbps.

Physical Connection

Fiber optic cables cannot plug directly into a standard home router because the signal is optical, not electrical. You need an Optical Network Terminal (ONT), usually provided by your ISP, which converts the fiber's light signal into an Ethernet signal your router can use . The typical setup is:

1. Fiber cable to ONT: Connect the fiber optic cable from the wall outlet to the ONT's optical port.
2. ONT to router: Use a Cat5e or Cat6 Ethernet cable to connect the ONT's Ethernet/LAN port to your router's WAN port .
3. Router to devices: Connect your devices via Ethernet or Wi-Fi as usual. Ensure the ONT is powered and the status lights indicate a stable connection before using the router.

Speed Considerations

If your router only supports 10/100 Mbps WAN/LAN ports, your internet speed will be capped at 100 Mbps, even if your fiber plan offers 1 Gbps or higher . To check or improve this:

• Verify the router's specifications to see if it supports gigabit speeds (1000 Mbps).
• If possible, upgrade to a gigabit router to fully utilize fiber speeds.
• Ensure you use Cat5e or higher Ethernet cables between the ONT and router, as older cables may limit speed.
• Check the router's settings for speed and duplex negotiation, setting it to 1 Gbps Full Duplex if supported .

Practical Implications

Using a 100 Mbps router on a fiber connection is functional but underutilizes your high-speed internet. For activities like streaming 4K video, online gaming, or large file transfers, a gigabit router is recommended to take full advantage of fiber's low latency and high throughput . In summary, while a 100 Mbps router can connect to fiber via an ONT, your maximum achievable speed will be limited to 100 Mbps, and upgrading to a gigabit-capable router is the best way to fully leverage your fiber connection.