
Standard
Fiber Optical Converter IEEE C37.94 MM/SM
- Typical distance
- 2 km
- Wavelength
- 1310/1550 nm
- Fiber optic connector
- LC
Product no 60-00-5593 (21-203)
Converters & Extenders

The 21-216 Fiber Optic G.703 Codirectional – IEEE C37.94 Converter is an electro-optical interface converter between G.703 Codir. 64 kbps (balanced) and IEEE C37.94 N×64 kbps optical interfaces. It extends the reach of balanced G.703 connections up to 2 km, ensuring interference-free, cost-effective transmission without signal degradation. The unit supports all IEEE C37.94 channel configurations and is easy to set up. The 21-216 is designed to connect teleprotection equipment to telecom multiplexers in substations. It can also directly interconnect protection devices when one or both units lack optical interfaces. Overall, it enables equipment using the IEEE C37.94 standard to interoperate with devices that only support G.703 interfaces.
In the catalogue

Fiber Optical Converter G.703 Codir – IEEE C37.94 MM
| Data rate | 2048 kbps |
|---|---|
| Protocol | IEEE C37.94 |
| Fiber | Multimode 50/125 μm or 62.5/125 μm, ST-connector |
| Optical system budget | 13 dB in 62.5/125 μm. 9 dB in 50/125 μm fiber |
| Typical distance | 0-2 km (3 dB system margin for 50/125 μm and 6 dB for 62.5/125 μm) |
| Data rate | 64 kbps |
|---|---|
| Protocol | G.703, Codir |
| Connector | RJ45, S/FTP cable |
| DC | 48 VDC to 250 VDC, ±20% |
|---|---|
| AC | 230 VAC ±20%, 50−60 Ηz |
| AC connector | IEC 320, 3 pin |
| Operating temperature | -25 to +55 oC |
|---|---|
| Storage temperature | -40 to +85 oC |
| Relative humidity, operating | 5 to 95 %RH |
| Relative humidity, storage | 5–95 % RH, non-condensing |
| Immunity | EN 61000-6-2 |
|---|---|
| Emission | EN 61000-6-4 |
| LVD | EN 50178; 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 |
| ESD | IEC 60255-22-2 Class 3, contact 6 kV, air 8 kV |
|---|---|
| Radiated | IEC 60255-22-3 / IEEE/ANSI C37.90.2; 35 V/m |
| Burst, power | IEC 60255-22-1 Class III |
| Burst, communication | IEC 60255-22-1 Class II; 0.5 kV diff; 1 kV common mode |
| Fast transient, power | IEC 60255-22-4 Class IV |
| Fast transient, communication | IEC 60255-22-4 Class II; 1 kV |
| Dielectric test | IEC 60255-5, 2.0 kV 1 min |
|---|---|
| Impulse voltage test | IEC 60255 / EN 50178 5 kV / 6 kV |
| Insulation resistance | IEC 60255-5; >100 Mohm at 500 VDC |
Specifications taken from the product datasheet. The datasheet remains the binding document — ask us if anything is unclear for your installation.
Environments
Where the equipment is used, and what makes each setting hard.
Environments →In the catalogue

Standard
Product no 60-00-5593 (21-203)

Standard
Product no 60-00-7251 (21-223)

Standard
Product no 60-00-7248

Standard
Product no 60-00-9166 (21-219v2)

Next step
Request a quote for this product – certification papers and procurement documentation included on request. Our engineers in Stockholm respond directly.
Verified credentials
All certifications



