EXFO America Inc. FTB-8120NGE-FLEX 2.5Gb/s Multiservice SONET/SDH/Ethernet/FC Test ModuleAvailable Optical Interface: Optical reach will be determined by selected transceivers. - SFP Transceiver must be specified.Available Electrical Interfaces:- DS1/2M (E1) TX/RX: Bantam and RJ