8 Ports Gigabit for downlink 2 Ports 10G SFP+ for uplink 6kV surge protection on all Gigabit Ethernet ports Physical stacking up to 9 switches Support Redundant Power Supply (RPS) ZTP (Zero-Touch Provisioning) Ethernet Ring Protection Switching (ERPS) IEEE 802.1ag for Connectivity Fault Management ITU-T Y.1731 for Delay Measurement Massages Manage through the Nuclias Network Controller. D-Link Corporation, No. 289, Sin Sin Road, Jhonghe City, Taipei County 235, Taiwan (R.O.C.), Podpora: https://www.dlink.com/cz/cs/support