D-Link 4 Port SFP/mini-GBIC Expansion Module, 1 Gbit/s, Gigabit Ethernet, Wired, 1000Base-SX, IEEE 802.3z, IEEE 802.3x, 0 - 40 °C
D-Link 4 Port SFP/mini-GBIC Expansion Module. Data transfer rate: 1 Gbit/s, Data link protocols: Gigabit Ethernet, Connectivity technology: Wired. I/O ports: 4x SFP ports, SFP