... up to 2 km (multi-mode fiber) or up to 20,40,60km (single- mode fiber). Note that the RS-232 interfaces ... -232 port 15MOptic port transmission Multi-mode 2KM, signal-mode 20,40,60KMLoading point to pointInterface protection 600W surge protection, 15KV static ... FC/ST/SC connectorEnvironment Working temperature-25 to 70Storage temperature-40 to 85Humidity Relative humidity 5% to 95%Power Input power5 ...