Featuring 12 1000Base-X SFP ports, the D-Link DES-6509 Fiber Module delivers expanded functionality for the DES-6500 chassis. This Ethernet blade device is fully compliant with the IEEE 802.3z standard, and delivers maximum data transfer rates of 1000 Mbps. In addition, it incorporates IEEE 802.3X flow control feature, and is capable of operating in both half and full duplex modes.