1.4E1/8E1/16E1 fiber optic multiplexer 2.RS232,1 channel service telephone,100M ... order wire phone ,perfect alarm monitoring function high integration level ,low power consumption ,stable performance ,convenient to use .Fourthermore, ... Optical fiber interface 1.fiber type : single mode fiber ,muti mode fiber ,optional2.wave length : 1310nm,1550nm,850nm,optional3.optical fiber interface : SC,FC , ...