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100Mbps fiber optic cable with a 150Mbps router

Fiber and communications infrastructure knowledge brief Published 19 Jun 2025

Use this reference to prepare product questions for BAGYOU FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

A 150 Mbps fiber connection may be limited to 100 Mbps due to router port speed, Ethernet cable type, or network configuration.

Key Factors Affecting Speed

Router Port Speed: Many routers, especially older or budget models, have WAN/LAN ports limited to 10/100 Mbps. Even if your fiber plan is 150 Mbps, a 100 Mbps port will cap the speed at 100 Mbps. Ensure your router has gigabit (1000 Mbps) WAN/LAN ports to fully utilize your fiber connection.

Ethernet Cable Type: The cable connecting your ONT (Optical Network Terminal) to the router must support gigabit speeds. Cat5e or Cat6 cables are recommended. Older Cat5 cables may only use 4 wires, limiting throughput to 100 Mbps.

Network Configuration: Check the router's network settings. Some routers may default to 100 Mbps full duplex. You can manually set the WAN port to 1000 Mbps full duplex in the router's advanced settings.

Also, verify that the connected device's network adapter supports gigabit speeds. Distance Considerations: Fiber optic cables can easily handle 100 meters without significant signal loss. The 100m length itself is unlikely to reduce speed, as fiber transmits data via light pulses with minimal attenuation over this distance.

Troubleshooting Steps

Verify Router Specifications: Confirm your router supports gigabit WAN/LAN ports. Upgrade if necessary. Check Ethernet Cable: Use a Cat5e or Cat6 cable between the ONT and router.

Replace if the cable is old or damaged. Inspect Device Settings: Ensure the connected PC or device network adapter is set to gigabit mode. Router Configuration: Access the router's web interface and set the WAN port to 1000 Mbps full duplex.

Reboot the router after changes. Test Connection: Use a wired connection to test speeds.

Wi-

Fi may not reach full fiber speeds due to interference or router limitations. By addressing these factors, you can ensure your 150 Mbps fiber connection is not artificially limited to 100 Mbps and achieve optimal performance.

100Mbps fiber optic cable with a 150Mbps router - BAGYOU FIBRE NETWORKS [PDF]

100Mbps fiber optic cable with a 150Mbps router

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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