Providing 16*10/100/1000Base-T(X) Ethernet ports and 4*100/1000Base-F(X) SFP sockets. Network Redundancy: RSTP/MSTP, O-Ring/O-Chain, IEC 62439-2 MRP (Media Redundancy Protocol). Supports IGMP v2/v3, IGMP Snooping, Port Trunking, SNMP, LLDP, and Modbus TCP. Industrial Design: DIN-rail mount, wide operating temperature -40 to 75°C, CE/FCC certified. Worry-Free Guarantee: Each ORing's switch undergoes rigorous reliability and performance testing. We aim to offer customers with high quality products. Please contact us via Newegg if any problem.