Available. The Beckhoff CU1521 is an EtherCAT-capable media converter designed for Industrial Fast Ethernet (100 Mbit/s) applications. It facilitates seamless media transition between RJ45 copper and multi-mode fiber optic connections, enabling EtherCAT communication over extended distances. Operating bidirectionally and collision-free with a constant delay of approximately 1 µs, the CU1521 ensures reliable and efficient data transmission. It supports a maximum distance of 2,000 meters for 100BASE-FX fiber optic connections and up to 100 meters for 100BASE-TX copper connections. The device is powered by a 24 V DC supply and features a compact design measuring 35 mm x 98.5 mm x 76.5 mm, suitable for various industrial environments. The CU1521 is particularly beneficial in applications requiring EtherCAT transfers over large distances or in scenarios with higher electromagnetic compatibility (EMC) demands on the bus line.