... signal-mode 20KM, 40KM, 60KM Communication Standard Accord: EIA RS-232 standard RS-232 signal: IN, OUT, GND Fiber signal:IN, OUT ... rate test Fiber wavelength: Multi-mode 850nm, signal-mode 1310nm RS-232 port 15MOptic port transmission Multi-mode 2KM, signal-mode ... 20, 40, 60KM Interface protection 600W surge protection, 15KV static protection ...