Zyxel GBIC-SX 1000Base-SX GBIC Transceiver, 1000 Mbit/s, 1000BASE-SX, 21653.5" (550 m), 850 nm, IEEE 802.3z, 0 - 70 °C Zyxel GBIC-SX 1000Base-SX GBIC Transceiver. Maximum data transfer rate: 1000 Mbit/s, Cabling technology: 1000BASE-SX. Maximum transfer distance: 21653.5" (550 m), Wavelength: 850 nm. Compliance industry standards: IEEE 802.3z. Safety: Class 1 Laser, CSA, TUV, 21 CFR 1040.10 & 1040.11. Dimensions (WxDxH): 2.56 x 1.18 x 0.394" (65 x 30 x 10 mm), Interface: GBIC, Form factor: Plug-in