The Moxa IMC-21-M-ST is an industrial Ethernet-to-fiber media converter that bridges 10/100BaseT(X) copper Ethernet to 100BaseFX multi-mode fiber using an ST connector. It’s a reliable way to extend network links and improve noise immunity in industrial environments—especially when multi-mode fiber is already the site standard.

Why We Love This Product

• Converts 10/100 copper Ethernet to multi-mode fiber for stable, interference-resistant links
• ST connector format—common in many existing industrial fiber installs
• Industrial-grade approach for plant environments where copper runs are unreliable
• Simple upgrade path for extending networks across zones without changing end equipment

How Our Customers Use It

• Extending Ethernet to remote cabinets using existing multi-mode fiber backbones
• Reducing dropouts caused by EMI on long copper Ethernet runs
• Inter-building links in industrial sites where electrical isolation is valuable
• Modernising plant networks without swapping switches or field devices

Choosing Tips

• Choose multi-mode (M) when your site fiber is multi-mode and distances are moderate
• Pick ST if your patch panels and leads are ST-based
• If your site uses single-mode fiber or you need longer distance links, choose the single-mode IMC-21 variant instead