28 adaptive gigabit Ethernet ports: 24 x PoE ports (RJ45) 2 x Uplink ports (RJ45) 2 x Uplink ports (SFP) Layer 2 Switch 802.1d (STP), 802.1w (RSTP), 802.1s (MSTP) Loop protection SNMP v1/v2c QoS VLAN Ethernet cable length measurement DHCP Server 6kV surge protection 19' rack mountable housing 802.3/802.3u/802.3x/802.3ab/802.3af/at compliant Input power 100-240 VAC Switching capacity 56 Gbps