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What is 100BASE-FX?
100BASE-FX is an Ethernet standard that supports 100 Mbps speeds over fiber optic cabling. Defined by the IEEE 802.3u standard, it uses multimode fiber (MMF) with SC, ST, or LC connectors for data transmission. Unlike 100BASE-TX, it provides longer-distance communication, up to 20 km with multimode fiber. 100BASE-FX is commonly used in industrial networks where electromagnetic interference (EMI) can affect copper-based connections. It ensures reliable, high-speed communication between devices like HMI, PLC, and switches in harsh environments.
Example Scenario: HMI and PLC communicating through a Switch
An HMI and PLC communicate using 100BASE-FX through a switch to ensure long-distance, interference-free data transmission. The HMI is located in a control room, while the PLC is on the factory floor, 500 meters away. Using multimode fiber optic cables, they transmit data at 100 Mbps, preventing electromagnetic interference (EMI) from nearby industrial machinery. This setup ensures stable communication and enhances network reliability in harsh environments.