The WS-G5483-SO Copper (SFP) are based on the GBIC Multi Source Agreement (MSA).It is compatible with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std 802.3. The WS-G5483-SO uses the GBIC's RX_LOS pin for link indication, and 1000BASE-X auto-negotiation should be disabled on the host system.