No power when fiber optic router is plugged in with network cable
If your fiber optic router loses power when a network cable is connected, the issue is likely related to the ONT, power supply, or electrical outlet rather than the cable itself.
Step 1: Check Power and Outlet
Ensure the router and ONT are properly plugged into a working electrical outlet. If the ONT is connected to a GFCI outlet, it may trip when overloaded or during a surge. Test the outlet by unplugging the ONT and plugging in another device like a lamp or hairdryer to confirm it works. If the GFCI has tripped, press the reset button before reconnecting the ONT ( ).
Step 2: Inspect the ONT and Router
- Verify that the ONT is receiving power. If no lights are on, check the power cord and outlet.
- Ensure the router's power cord is firmly connected to both the device and the outlet ( ).
- If the router has a battery backup, temporarily disconnect it to rule out interference with the power supply ( ).
Step 3: Check Network Cable and Ports
- Use a high-quality Ethernet cable (Cat5e or higher) and ensure it is fully inserted into the router's WAN/LAN port and the ONT ( ).
- Inspect the cable for visible damage or kinks. A shorted or damaged cable can sometimes cause power issues.
Step 4: Restart Devices
- Power off the router and ONT.
- Wait at least one minute, then power on the ONT first, followed by the router.
- Allow several minutes for the devices to boot and establish a connection ( ).
Step 5: Firmware and Hardware Considerations
- If the router powers on without the cable but fails when connected, a hardware fault in the router's WAN port or internal circuitry may exist ( ).
- Ensure the router firmware is up to date to prevent configuration-related power issues ( ).
Step 6: Contact Your ISP
If the router still does not power on when the network cable is connected, the problem may require professional support. Your ISP can test the ONT, replace faulty equipment, or check for line issues ( ). By systematically checking the outlet, ONT, router, and cable, most power-related issues can be identified and resolved without replacing equipment.
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