... Transmission distance: MM 2Km, SM 20Km Fiber interface type: ST/SC/FC (optional); ST (standard configuration) Relay Contact rating:DC30V@1A ... .DescriptionunitCi-pf110-MMultimode fiber 2KM, one fiber port, connector ST/SC/FC, Rate data: 0~12M.PcsCi-pf120-MMultimode fiber 2KM ... mode fiber, transmission distance: 20KM, single fiber port, connector ST/SC/FC, Rate data: 0~12M.PcsCi-pf120-SSingle mode fiber ...