POE Switch CKP Series DIN-Rail Industrial POE Switches IGMPv1/v2, GMRP, GVRP, SNMPv1/v2C/v3 DHCP Service/Client, TFTP, SNTP POE SwitchIndustrial Ethernet switches ... Class of ServiceIEEE 802.3X for AuthenticationIEEE 802.3ad for Port Trunk with LACP Protocols:IGMPv1/v2, GMRP, GVRP, SNMPv1/v2C ... , Bridge MIB, RSTP MIB,PMON MIB Group 1,2,3,9 Power Requirements:Input Voltage: -DC48(36~72V); -DC24(18~36V ...