1-Port Mini-GBIC SFP to 1000BaseSX, 550m - Mini GBIC to 1000BaseSX Multi-mode Fiber Transceiver - Distance up to 550m - Suitable for all D-Link switches with Mini GBIC slots Multi-mode Fiber Transceiver (550 m) DEM-311GT - 1000BASE-SX port (IEEE 802.3z standard) - Duplex LC connector - Full duplex operation - 802.3x flow control support - Fiber type: 50um or 62.5um multi-mode fiber up to 550 m - Wave length: 850nm - Power support: 3.3V - Hot pluggable - Class 1 laser product complies with EN 60825-1 - TTL signal detect indicator.