... , zero delay automatic transmit Multi-mode 2KM, signal-mode 20KM, 40KM, 60KM The Model277/A Series converter is equipped ... Internal or external power choice.4.Multi-mode 2KM, signal-mode 20KM, 40KM, 60KMCommunication Standard Accord EIA RS-232standard RS-232 ... 120Kbps, auto serial band rate testFiber wavelengthMulti-mode 850nm, signal-mode 1310nm Electricity port transmissionRS-232 port 15MOptic port ...