EXFO America Inc. FTB-8120NGE 2.5Gb/s Multiservice SONET/SDH/Ethernet Test ModuleOptical Interface: Optical reach will be determined by selected transceivers. - SFP Transceiver must be specified.Optical Rates (ENABLED by Default) :OC-3/STM-1, OC-12/STM-4, OC-48/STM-16155Mb