(18)Port Gigabit IPv6 IPv4 Layer 2 Managed Desktop Rackmount Switch.(16)1000Mbps RJ45 Gigabit Ports (2)100 1000X mini-GBIC SFP slots. Switch Fabric 36Gbps non-blocking, Switch Throughput@64 bytes 26.7Mpps @64 bytes, Dimension 445 x 207 x 45 mm (1U height), Rackmount kit included, mini-GBIC SFP modules sold seperate