SCALANCE XR552-12M, managed IE switch, 19-inch rack, 4x 1000/10000 Mbit/s SFP+, 12x 100/1000 Mbit/s 4-port media modules, electrical, electrical PoE or optical, LED diagnostics, fault relay contact, select/set button, PROFINET IO Device, network management, integrated redundancy manager, office functions (RSTP, VLAN, IGMP, ...), C-PLUG included, Layer 3 ready, ports at the back. SCALANCE XR552-12M Managed, Layer 2 rack switch, 4x 1000/10000 Mbit/s SFP+, 12x 100/1000 Mbit/s for media modules, PoE, rear ports for backbone networking and connection to office IT. The future of industrial network design: Structure your plant network with SCALANCE XR522-12M as a Layer 3 switch and central component in the industrial backbone. This creates the ideal foundation for implementing networks that set standards in reliability and performance. The modular, high-performance, and industrial-grade Layer 3 switches are designed for building electrical and optical line, ring, and star topologies. With SCALANCE XR522-12M, you have complete freedom in choosing connection media and can use different redundancy concepts.