SFP Optical Transceiver, 20km Reach Fibertower Communications Base Info Model NO.:FSP3124-L2xxTrademark:FibertowerOrigin:ChinaHS Code:85177060 Description Pre:10Gbps XFP Optical Transceiver, 10km Reach Next:2.5Gbps SFP Optical Transceiver, 2km Reach