DS-SFP-FC-2G-SW 2G Fibre Channel SFP 850nm 300m DOM Transceiver DS-SFP-FC-2G-LW 2G Fibre Channel SFP 1310nm 10km DOM Transceiver DS-SFP-FC-4G-LW 4G Fibre Channel SFP 1310nm 10km DOM Transceiver If you have any questions, please contact with me, I will try my best for you! Best Wishes Helen Newstar Networking Technology Co., Ltd.