Layer 2 and Layer 3 Ethernet switches Fastest Redundant Ethernet Ring-(recovery time < 10ms over 250 units of connection) Multiple Redundant Ethernet technology RSTP/STP Configurable by Web-based Gigabit modules available Rugged, enterprise-class networking Advanced security features Rugged industrial DIN rail and Rack mount options Available in SM, MM FO with 5 to 32 ports.