IMC-21A-M-ST – MOXA Ethernet-to-Fiber Media Converters

USD $ 139.23


Manufacturer Part Number: MOXA IMC-21A-M-ST
OEM Spec Ref 

The MOXA IMC-21A-M-ST Ethernet-to-Fiber Media Converters is an essential device designed to facilitate reliable and efficient data transmission between Ethernet and fiber optic networks. Ideal for extending communication distance through fiber optic cabling, this converter supports a wide range of applications and industries, ensuring robust data integrity and enhanced network scalability.

Key Features:

  • Industrial-grade Design: Built to operate in tough industrial environments, the IMC-21A-M-ST withstands extreme temperatures ranging from -10 to 60°C, ensuring reliable performance under various operational conditions.
  • High Data Transmission Rate: Equipped with Fast Ethernet capabilities, it provides high-speed data transfer rates that are essential for bandwidth-intensive applications.
  • Link Fault Pass-Through (LFP): Features an LFP function that notifies network administrators of any network failures, enhancing troubleshooting processes and reducing downtime.
  • Easy Deployment: Simple plug-and-play installation with no software configuration needed, making setup quick and straightforward.
  • Dual Power Inputs: Enhances reliability and uptime by providing redundancy through its dual power inputs, mitigating power-related disruptions.


  • Enhanced Network Reach: Enables the extension of Ethernet networks over long distances using fiber optic cables, which is crucial for large-scale deployments.
  • Improved Network Security: Fiber connections are inherently more secure against electromagnetic interference and eavesdropping compared to copper cables, providing an additional layer of security.
  • Scalability: Facilitates network scalability and flexibility by allowing connections over greater distances and the integration of new devices without significant infrastructure changes.
  • Durability and Reliability: Constructed with robust materials and designed to meet industrial standards, ensuring long-term reliability and reduced maintenance costs.


  • Industrial Automation: Crucial for linking devices in harsh industrial environments where long distance data transmission is required.
  • Traffic Management Systems: Plays an integral role in traffic control centers to ensure continuous and reliable data flow between sensors and central servers.
  • Security and Surveillance: Enables high-speed data transmission necessary for high-definition video surveillance across large areas.
  • Remote Monitoring and Control Systems: Essential for the efficient operation of systems that require real-time data from remote locations.

The MOXA IMC-21A-M-ST Ethernet-to-Fiber Media Converters stands as a testament to MOXA’s commitment to delivering high-quality and resilient networking solutions that meet the evolving needs of modern industrial environments.


Ethernet Interface 10/100BaseT(X) Ports (RJ45 connector) 1
100BaseFX Ports (multi-mode ST connector) 1
Magnetic Isolation Protection 1.5 kV (built-in)
Optical Fiber Refer table 2
Power Parameters Input Current 12 to 48 VDC, 265mA (Max.)
Input Voltage 12 to 48 VDC
Overload Current Protection Supported
Power Connector Terminal block
Reverse Polarity Protection Supported
Physical Characteristics Housing Metal
IP Rating IP30
Dimensions 30 x 125 x 79 mm (1.19 x 4.92 x 3.11 in)
Weight 170 g (0.37 lb)
Installation DIN-rail mounting
Environmental Limits Operating Temperature -10 to 60°C (14 to 140°F)
Storage Temperature -40 to 75°C (-40 to 167°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Standards and Certifications EMC EN 55032/24
EMI CISPR 32, FCC Part 15B Class A
EMS IEC 61000-4-2 ESD: Contact: 6 kV; Air: 8 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m
IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV
IEC 61000-4-5 Surge: Power: 1 kV; Signal: 1 kV
IEC 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m
IEC 61000-4-8 PFMF
IEC 61000-4-11
Environmental Testing IEC 60068-2-1
IEC 60068-2-2
IEC 60068-2-3
Safety EN 60950-1, UL 60950-1
Vibration IEC 60068-2-6
MTBF Time 353,000 hrs
Standards MIL-HDBK-217F
Warranty Warranty Period 5 years
Details See


Optical Fiber

Multi-Mode Single-Mode
Fiber Cable Type OM1 50/125 µm G.652
800 MHz x km
Typical Distance 4 km 5 km 40 km
Wavelength Typical (nm) 1300 1310
TX Range (nm) 1260 to 1360 1280 to 1340
RX Range (nm) 1100 to 1600 1100 to 1600
Optical Power TX Range (dBm) -10 to -20 0 to -5
RX Range (dBm) -3 to -32 -3 to -34
Link Budget (dB) 12 29
Dispersion Penalty (dB) 3 1

Note: When connecting a single-mode fiber transceiver, we recommend using an attenuator to prevent damage caused by excessive optical power.
Note: Compute the “typical distance” of a specific fiber transceiver as follows: Link budget (dB) > dispersion penalty (dB) + total link loss (dB).

Weight 0.17 kg
Dimensions 3 × 12.5 × 7.9 cm