How to use a 100Mbps fiber optic switch

To configure a 100Mbps fiber optic switch, you need to install compatible 100BASE-FX SFP modules, set the port speed to 100 Mbps, configure duplex mode, assign VLANs, and save the configuration.Step 1: Install the 100BASE-FX SFP ModuleInsert a 100BASE-FX SFP transceiver into the fiber-enabled port of your switch. These modules support 100Mbps Fast Ethernet over multimode fiber at 1310nm and can reach distances up to 2 km, providing strong EMI immunity and reliable connectivity in industrial or legacy networks .Step 2: Connect Fiber CablesUse multimode fiber cables to connect the SFP module to the corresponding device or switch. Ensure proper TX/RX alignment and check that the fiber connectors are clean to avoid signal loss .Step 3: Access the SwitchConnect your computer to the switch using an Ethernet cable or console connection. Use a terminal client like PuTTY to log in to the switch with the switch's IP address. Configure basic settings such as hostname, enable password, and management IP if not already set .Step 4: Configure Port Speed and DuplexFor 100FX SFP ports, manually set the speed to 100 Mbps and the duplex mode to full (or half if required). On ExtremeSwitching devices, the command format is:CodeCopyconfigure ports port_list {medium fiber} auto off speed 100 duplex full If autonegotiation is enabled, the switch will automatically select the best speed and duplex supported by the connected device .Step 5: Configure VLANsCreate or assign a VLAN for the fiber ports to separate network traffic. For example, on Cisco switches:CodeCopyvlan 10name Fiber_VLANinterface range gi1/0/1 - 2switchport mode accessswitchport access vlan 10 This ensures that fiber traffic is properly segmented and managed .Step 6: Verify ConnectivityCheck the link status and port LEDs to confirm the fiber connection is active. Use commands like show interfaces status or show vlan brief to verify that the port is up and assigned to the correct VLAN .Step 7: Save ConfigurationAfter completing the setup, save the configuration to the switch's memory to ensure it persists after a reboot:CodeCopycopy running-config startup-config This stores the current settings in flash memory .Best PracticesEnsure SFP module compatibility with your switch model.Keep fiber connectors clean and avoid bending cables sharply.Use full-duplex mode for optimal performance.Document VLAN assignments and port configurations for future maintenance. By following these steps, your 100Mbps fiber optic switch will be properly configured for stable and reliable network operation.