20+4+4 port Gigabit switch with 20x 100/1000 Mbps SFP ports, 4x combo ports RJ-45/SFP, 4x 10G SFP+ slots for accommodating SFP/SFP+ modules (dual speed), management via CLI (console, Telnet), Web and SNMP, supports Spanning Tree (STP, RSTP, MSTP), IPv6, VLAN, LACP, IGMP, QoS, OAM according to IEEE802.3ah and IEEE802.3ag, flexible power supply with 100-240V AC or 48 to 60VDC possible , including 19' mounting kit, extended temperature range 0°C to 50°C