... interface(120 BG telephone channel) (2)local device monitor remote device(2 row LEDs,upper indicate local status, ... , DC-48V,DC+24V. (5)transmission distance:2-120Km (6)two fiber bidirection and single fiber ... 10 ) Receive range >-30dB Transmission distance multi-mode 2 Km, single-mode 40 Km, single-mode 80 ... 823.E1 interface parameter Code HDB3 Interface Rate 2.048Mbp/s±50ppm Interface standard ITU-T G ...