overview: there are normally two modes for data transmission with optical fiber: with 1st mode, data of the v.35 interface is converted into g703 e1 signal through interface converter and then transmitted via the empty e1 channel in the optical multiplexer; and with the 2nd mode, v.35 data signal is directly modulated onto the optical fiber. the function of this device is to directly modulate one n*64k v.35 data signal onto the mono-mode or multi-mode optical fiber. specifications user interface type v.35 user interface mode dce (supports tail connection) interface bit rate n*64k (n＝1~32) transmission distance 50km (mono-mode) 2km (multi-mode) clock internal clock/external clock/slave clock (line clock) three modes optional exterior dimensions 23cm×14.3cm×4.9cm operating environment power supply ac180v ~ ac240v，50hz dc -48v dc +24v power consumption < 5w working temperature 0℃ ~ 50℃ storage temperature -40℃ ~ +70℃ relative humidity 95 % free from corrosive and solvent gases, flying dusts, and interference of strong magnetic fields.