... function3.supply one channel order wire phone interface4.two fiber bidirection ,single fiber bidirection ,optional5.meet the carrier-class demands ,the ... parameters Optical fiber interface fiber typesingle mode fiber ,muti mode fiber ,optionalwave length1310nm,1550nm,850nm,optionaloptical fiber interfaceSC,FC ,ST optionaloptical path code1B1Hoptical modulesingle fiber ,duplex fiber ,optionalreceiving ...