Router after replacing fiber optic cable

After replacing a fiber optic cable, reconnect your router to the ONT via Ethernet, ensure proper IP configuration, and verify router compatibility to restore full internet access.Step 1: Verify ONT and Fiber ConnectionEnsure the Optical Network Terminal (ONT) is properly connected to the new fiber optic cable and powered on. The ONT converts the fiber's light signals into an Ethernet connection for your router. Wait for the ONT's status lights to stabilize, which usually takes 2–5 minutes .Step 2: Connect the RouterUse a high-quality Ethernet cable (Cat6a or higher) to connect the ONT's Ethernet port to your router's WAN port. Make sure your router supports gigabit speeds or higher to fully utilize fiber internet . If your router has specialized fiber ports (SFP or SFP+), use them according to the manufacturer's instructions.Step 3: Configure Router SettingsAccess your router's admin panel via a web browser (commonly 192.168.0.1 or 192.168.1.1). Check or update the following settings:VLAN, DHCP, or PPPoE settings if required by your ISP .Ensure the router's WAN IP is correctly assigned. If the router cannot access the internet, it may have an IP conflict with the ONT or ISP gateway. Consider changing the router's LAN subnet (e.g., from 192.168.1.x to 192.168.2.x) to avoid conflicts .Step 4: Test ConnectivityAfter configuration, test your internet connection by checking speed and device connectivity. Ensure all devices can access the network and the router's admin panel. If you cannot access devices on your network, verify that the ONT or ISP gateway is not in bridge mode or conflicting with your router's IP range .Step 5: Troubleshooting Common IssuesCannot access router admin panel: Check for IP conflicts or reset the router to factory settings and reconfigure.Limited speeds: Ensure the router supports your fiber plan's speed tier and that Ethernet cables are rated for high-speed data transfer .Multiple routers or mesh networks: Use bridge mode or assign one router to a DMZ to prevent conflicts between devices . By following these steps, your router should function correctly with the new fiber optic cable, providing stable, high-speed internet throughout your network.