... channel order wire phone interface4.two fiber bidirection ,single fiber bidirection ,optional5.meet the carrier-class demands ... hung ,and insert-card7.three types of power supply mode : 220VAC,-48VDC,+24VDC8.transmission distance : 2~120Km9. ... SNMPTechnical parameters Optical fiber interface fiber typesingle mode fiber ,muti mode fiber ,optionalwave length1310nm,1550nm,850nm,optionaloptical fiber ...