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Moxa IMC-21A-M-ST Industrial Media Converter 10/100BaseT(X) to 100BaseFX Multi-Mode ST Fiber

Brand Moxa

Model Number IMC-21A-M-ST

UPC 747356311014

Manufacture Warranty

EpicRise Warranty 1 Year

Product Highlights

• Industrial-grade media converter operates reliably in -10 to 60°C environments with rugged metal housing and IP30 protection

• Converts 10/100BaseT(X) Ethernet to 100BaseFX multi-mode fiber with ST connector, extending network reach up to 4 km

• Link Fault Pass-Through (LFP) ensures immediate fault detection and reporting across network segments

• DIN rail mounting and compact 30mm width design enables flexible installation in distribution boxes and control cabinets

• 1.5kV isolation protection and MTBF of 353,000 hours ensures reliable operation in electrically noisy industrial environments

Overview
Specifications
FAQ
User Guides
Reviews

The Moxa IMC-21A-M-ST industrial media converter is designed to extend Ethernet networks beyond copper cable distance limitations in harsh industrial environments. This entry-level converter bridges 10/100BaseT(X) copper Ethernet to 100BaseFX multi-mode fiber with ST connector, enabling network infrastructure that operates reliably in temperatures from -10 to 60°C where standard commercial equipment fails.

Built for industrial automation, manufacturing, and process control applications, the IMC-21A-M-ST provides the physical layer conversion needed to connect field devices to fiber backbone networks. Its rugged metal housing, DIN rail mounting capability, and compact 30mm width allow flexible deployment in space-constrained industrial settings where reliability cannot be compromised.

Best For

This industrial media converter is engineered for enterprise applications requiring fiber optic network extension in demanding environments:

- Factory Automation Networks: Connects Ethernet-based PLCs, HMIs, and industrial controllers to fiber backbone infrastructure while withstanding temperature extremes and electrical noise on production floors

- Outdoor Industrial Installations: Extends network connectivity to remote equipment in utility substations, oil and gas facilities, and transportation systems operating in -10 to 60°C temperature ranges

- Electrical Substation Communications: Provides 1.5kV isolation protection for Ethernet equipment in high-voltage environments where electrical interference disrupts standard networking equipment

- Building Control Systems: Enables long-distance fiber connections for HVAC, lighting, and security systems distributed across large industrial or commercial facilities

- Process Control Networks: Supports real-time monitoring and control applications requiring reliable fiber conversion with Link Fault Pass-Through for immediate fault detection

Key Features

- Auto-negotiation on RJ45 port supports mixed 10BaseT and 100BaseT(X) operation per IEEE 802.3u standard, allowing flexible network speed configurations

- Multi-mode fiber with ST connector reaches 4 km transmission distance at 1300nm wavelength with 12 dB link budget

- Link Fault Pass-Through (LFP) propagates link failures between copper and fiber ports for immediate network fault detection and troubleshooting

- DIP switches provide tool-free configuration of port speed (10/100M), duplex mode (half/full), and auto-negotiation settings without software

- LED indicators for power, 10/100M copper port status, 100M fiber port status, and full-duplex/collision detection enable quick visual diagnostics

- Wide 12-48 VDC input voltage range with 1.5kV built-in magnetic isolation protects connected equipment from electrical transients

- IP30-rated metal housing with DIN rail mounting kit supports installation in industrial control cabinets and distribution boxes

- 353,000-hour MTBF rating ensures long-term reliability in mission-critical industrial network infrastructure

Quick Specs

Model	IMC-21A-M-ST
Ethernet Interface	1 x RJ45 10/100BaseT(X)
Fiber Interface	1 x Multi-mode ST 100BaseFX
Fiber Type	OM1 50/125 µm multi-mode
Transmission Distance	Up to 4 km (multi-mode)
Wavelength	1300 nm
Operating Temperature	-10 to 60°C (14 to 140°F)
Power Input	12-48 VDC (24 VDC nominal)
Current Consumption	265 mA @ 12 VDC
Isolation Protection	1.5 kV built-in
Mounting	DIN rail (30mm width)
Enclosure	Metal housing, IP30
Dimensions (W x D x H)	30 x 125 x 79 mm
MTBF	353,000 hours
Standards Compliance	IEEE 802.3, IEEE 802.3u, IEEE 802.3x

What's Included

- 1 x IMC-21A-M-ST Media Converter

- 1 x Quick Installation Guide

Product Details
Color	Black
Connection Type	Ethernet
Power Source	DC-powered

What industrial environments is the IMC-21A-M-ST best suited for?

The IMC-21A-M-ST is designed for factory floors, outdoor industrial installations, and electrical substations operating in -10 to 60°C temperature ranges. Its 1.5kV isolation protection and IP30 metal housing handle electrically noisy environments where standard commercial converters fail. The DIN rail mounting and compact 30mm width fit space-constrained industrial control cabinets.

Why choose the IMC-21A-M-ST over other models in the IMC-21A series?

Select the IMC-21A-M-ST when your installation uses multi-mode fiber with ST connectors and operates in standard industrial temperature ranges (-10 to 60°C). Choose the IMC-21A-S-SC for single-mode fiber or the T-series models (IMC-21A-M-ST-T) if you need extended -40 to 75°C operation. The ST connector version is specified when existing infrastructure uses ST rather than SC fiber terminations.

Is the IMC-21A-M-ST a cost-effective choice for industrial Ethernet-to-fiber conversion?

The IMC-21A-M-ST provides industrial-grade reliability at an entry-level price point with 353,000-hour MTBF and rugged -10 to 60°C operation. Its Link Fault Pass-Through and 1.5kV isolation protection deliver features typically found in higher-priced managed converters. The DIN rail design eliminates rack mounting costs while the wide 12-48 VDC input works with existing industrial power supplies.

What equipment and network protocols is the IMC-21A-M-ST compatible with?

The IMC-21A-M-ST is compatible with any IEEE 802.3 Ethernet device including PLCs, industrial switches, HMIs, and IP cameras. It supports IEEE 802.3u auto-negotiation for 10/100 Mbps operation and IEEE 802.3x flow control. The multi-mode ST fiber port connects to OM1 50/125 µm fiber infrastructure operating at 1300nm wavelength. Standard 12-48 VDC industrial power supplies are supported.

What is the maximum fiber transmission distance for the IMC-21A-M-ST?

The IMC-21A-M-ST achieves up to 4 km transmission distance over OM1 50/125 µm multi-mode fiber at 1300nm wavelength. The optical specifications provide 12 dB link budget with TX power range of -10 to -20 dBm and RX sensitivity of -32 dBm. Actual distance depends on fiber quality, number of connectors, and splice losses in your installation.

How does Link Fault Pass-Through (LFP) work on the IMC-21A-M-ST?

Link Fault Pass-Through detects link failure on either the copper or fiber port and immediately disables the opposite port to propagate the fault across the conversion. This allows network monitoring systems to detect failures on the far side of the converter. LFP can be enabled or disabled via DIP switch depending on your network topology requirements.

What power supply specifications are required for the IMC-21A-M-ST?

The IMC-21A-M-ST operates from 12-48 VDC power supplies with 24 VDC nominal voltage. Current consumption is 265 mA at 12 VDC input. The wide input voltage range allows connection to standard industrial DC power systems without additional voltage regulation. Built-in 1.5kV magnetic isolation protects the converter from electrical transients on the power line.

Can the IMC-21A-M-ST be configured without management software?

The IMC-21A-M-ST uses DIP switches for all configuration settings including copper port speed (10/100M), duplex mode (half/full), force/auto-negotiation mode, and Link Fault Pass-Through enable/disable. No management software or console connection is required. LED indicators provide visual status feedback for power, port speed, and link activity on both copper and fiber interfaces.