Fiber Optical Converter G.703-C37.94 E1 820nm Multimode

21-219 is an electro optical multiplexer between one G.703/704 E1 and two IEEE C37.94 (C3794) optical ports. The two IEEE ports are fully mapped into G.703 (G703) standard frame structure of the E1 port, allowing for further SDH/ PDH multiplexing and de-multiplexing.

21-219 derives it synchronization from the network port (E1) or from an internal 2048Kbps PDH compliant clock enabling it to be used in leased line applications using electrical E1 modems such as SHDSL and alike.

We provide both Multimode (820nm) and Singlemode (1310nm) 21-219 for up to 120km. Contact us for or different wave-lenghts and distances.



  • Two independent IEEE C37.94 fiber optical connections over a single E1
  • Standards compliant for power substation installations i.e ABB
  • 19″ mounting with only 200mm depth
  • Single power supply range from 48VDC to 230VAC

Technical Data

Fiber optical link

  • Data Speed 2048kbps
  • Protocol IEEE C37.94
  • Wave-lenght 820nm
  • Fiber Multimode 50/125µm or 62,5/125µm, ST-connector
  • Optical System Budget 13dB in 62,5/125µm. 9dB in 50/125µm fiber
  • Typical distance 0-2km (3dB system margin for 50/125µm and 6dB for 62,5/125µm)


  • Galvanic Data speed 2048kbps
  • Galvanic Protocol G.703, E1
  • Connector 2 x BNC , Coaxial cable

Power Supply

  • DC 48V DC to 250V DC, ±20%
  • AC 230V AC , ±20%, 50 60 Hz
  • AC-connector IEC 320, 3-pin


  • Operating Temperature Range -25 to +55°
  • Storage Temperature Range -40 to +85°
  • Relative Humidity Operating 5 to 95%
  • Relative Humidity Storage 5 to 95% non condensing

CE compliance

  • Immunity EN 61000-6-2
  • Emission EN 61000-6-4
  • LVD EN 50187; RIV=250 V OVC=III


  • Vibration IEC 60255-21-1 Class 2
  • Shock IEC 60255-21-2 Class 2
  • Seismic IEC 60255-21-3 Class 2

EMC compliance

  • ESD IEC 60255-22-2 Class 3, contact 6kV, air 8kV
  • Radiated IEC 60255-22-3 / IEEE/ANSI C37.94.2; 35V/m
  • Burst Power IEC 60255-22-1 Class III
  • Burst Communication IEC 60255-22-1 Class II; 0,5kV diff; 1kV common mode
  • Fast Transient Power IEC 60255-22-4 Class IV
  • Fast Transient Communication IEC 60255-22-4 Class II; 1kV


  • Dielectric Test IEC 60255-5, 2,0kV 1min
  • Impulse Voltage Test IEC 60255 / EN50178 5kV / 6 kV
  • Insulation Resistance IEC 60255-5; > 100Mohm at 500VDC

Dimensions and Weight

  • Physical size Height 45mm, Width 483mm, Without brackets 380mm), Depth 173mm
  • Weight 3 kg


FS19187 Datasheet 21-219 Fiber optic IEEE C37.94-G.703 E1 Multiplexer 820nm Multimode R2

Technical Manual

Technical Manual 21-219



Associated products