The Advantech ADAM-6521/ST is a robust 5-port industrial-grade Ethernet switch specifically designed to meet the demands of harsh industrial environments. It features four 10/100 Mbps RJ-45 copper ports and one 100 Mbps multi-mode fiber optic port with an ST connector, making it ideal for extending network connections over long distances and in areas with high electromagnetic interference. The ADAM-6521/ST supports full/half-duplex flow control, MDI/MDI-X auto-crossover, and includes broadcast storm protection to ensure reliable network communication. Its wide operating temperature range and DIN-rail mountable design allow for flexible and dependable deployment in critical industrial automation and control applications.