D-Link Dgs-1530-20 16 X 1G Rj45 + 4X10G Sfp + Stackable Smart Switch, 6Kv Surge Protection. Physical Stacking Up To 9 Switches. Support Redundant Power Supply (Rps). Ztp (Zero-Touch Provisioning). Ethernet Ring Protection Switching (Erps). Manage Through The Nuclias Network Controller