Industrial Isolated 8-port Ethernet Redundant Ring Switch. The RS-408/RSM-408 series is a 8-port Industrial Ethernet (10/100 Base-TX) Real-time Redundant Ring Switch. RS-408/RSM-408 supports 10/100M auto negotiation feature and auto MDI/MDI-X function, it can automatically switch the transmission speed (10 Mbps or 100 Mbps) for corresponding connections.Built-in ICP DAS Cyber-Ring technique enables multiple switches to be placed into a redundant ..