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  1 * E1 to Fiber Optic Converter SM SC 20km AC Power
  - Conforms to all relevant ITU series standards( ITU-T G.703 G.704 G.823)  
  - Framing or non-framing mode in option  
  - E1 time slot in arbitrary option  
  - Balanced 120Ω/non-balanced 75Ω interfaces automatic  
  - Support the loop back of local analog/digital interface  
  - Support remote loop back function (valid on under framing mode)  
  - Support pseudo-random code test function, providing convenience for the test of optic fiber line status  
  - 120km trunking -free transmission distance for single-mode optic fiber  
  - Capable to be communicated with V.35 fiber modem  
  - Available with complete line detection and alarm indications  
  - Available with independent structure and 19-inch frame-mounted structure (frame-mounted structure can be inserted with 16 modules);  
  - AC 220V and DC –48V inputs may be selected for fiber optic modems of both structures;  
  - For frame-mounted fiber optic modems, dual power supply heat backup is provided to ensure a Receiving level:0~-43db