RGS-PR9000 is Layer-3 modular managed redundant ring Ethernet switch with 4 slots. The switch is designed for power substation and rolling stock application, fully compliant with the requirement of IEC 61850-3 and IEEE1613. With support of Ethernet Redundancy protocol, O-Ring and MSTP can protect mission-critical applications from network interruptions or temporary malfunctions. And support wide operating temperature from -40~85°C (If use 10G SFP module then operating temperature is -20~60°C).