How to replace the fiber optic cable in a router

Replacing a fiber optic cable involves safely disconnecting the old cable, connecting it to the Optical Network Terminal (ONT), linking the ONT to your router via Ethernet, and testing the connection.

Step 1: Gather Necessary Equipment

Before starting, ensure you have:

• Fiber optic cable (SC/APC or SC/UPC connectors)
• Optical Network Terminal (ONT) provided by your ISP
• Ethernet cable to connect the ONT to your router
• Router compatible with fiber input (SFP or WAN port labeled "ONT" or "Fiber")
• Safety gear: gloves and eye protection to prevent fiber splinters or exposure to laser light .

Step 2: Disconnect the Old Fiber Cable

• Power off your router and ONT.
• Carefully unplug the existing fiber optic cable from the ONT or wall outlet. Avoid bending or twisting the cable, as fiber strands are delicate .
• Inspect the connectors for damage; replace the cable if necessary.

Step 3: Connect the New Fiber Cable

• Plug one end of the new fiber optic cable into the wall outlet or fiber entry point.
• Connect the other end to the ONT's designated fiber port.
• Power on the ONT and wait 2–5 minutes for the status lights to stabilize .

Step 4: Link the ONT to Your Router

• Use an Ethernet cable to connect the ONT's Ethernet/LAN port to your router's WAN port.
• Power on the router and wait for the indicator lights to confirm a successful connection .

Step 5: Configure and Test

• Access your router's admin panel via a browser (commonly 192.168.1.1).
• Enter ISP credentials if required.
• Update firmware to ensure optimal performance.
• Test the connection by connecting a device via Wi-Fi or Ethernet and running a speed test. If the connection fails, reboot the ONT and router or contact your ISP .

Safety and Best Practices

• Avoid looking directly into fiber ends; invisible laser light can cause eye damage.
• Handle cables gently to prevent breakage.
• Use a visual fault locator or OTDR for testing if needed.
• Keep the work area clean and organized to prevent accidents . Following these steps ensures a safe and effective replacement of your fiber optic cable, restoring high-speed internet connectivity to your router.