InMax PT3728 4G+24 Ports Modularized Advanced Managed Industrial Ethernet Switches Man Features Modularized design for flexible and scalable networks Support L3 multiple dynamic routing protocols such as RIP v1/v2, OSPFv2 and BGPv4, static routes and IP policy routing. Proprietary Protocol "Max Ring" (recovery time < 20ms), RSTP,STP and MSTP for network redundancy SNMPv3,IEEE 802.1X,HPS,and SSH to enhance network security Support VLAN and QoS Easy network management through web browser,CLI,Telnet/serial console,Windows utility and SNMP Industrial-grade design with -40 to +75°C operating temperature and redundant power inputs Metal,IP40 protection Optional front and rear wiring brings convenience for different wiring environment