General
Fibre optic connector	SC
Range	4 km
Wavelength	1300 nm
Dispersion penalty	3 dB
Overcurrent protection

The Moxa IMC-21A-M-SC-T is an industrial media converter that converts Ethernet connections in the 10/100BaseT(X) standard via RJ45 interface into fiber optic connections in the 100BaseFX format. The device serves as a bridge between wired networks and fiber optic infrastructures, particularly in environments with high requirements for reliability and environmental resistance. It is designed for use in industrial plants, factory automation systems, enclosures, and infrastructure projects where stable and interference-resistant data transmission is required.

Applications

The converter is designed for use in harsh industrial environments where high temperatures, mechanical stress, and electromagnetic interference occur. It is particularly suitable for applications in the manufacturing industry, energy supply, transportation technology, and for networking distributed systems, where fiber optic enables transmission over longer distances. Mounting is done on a DIN rail, allowing flexible integration into existing enclosures.

Functions and Features in Detail

The IMC-21A-M-SC-T features an RJ45 interface for Ethernet connection and an SC connector for multi-mode fiber optic. The conversion is bidirectional, with data rate limited to 100 Mbit/s in the fiber optic section. Configuration is done via DIP switches, enabling simple and tool-free setup. An integrated Link Fault Pass-Through (LFPT) ensures that in case of fiber optic connection failure, the Ethernet connection is also interrupted, allowing early detection of network errors.

Technology Explained Simply

The fiber optic transmission operates at a wavelength of 1300 nm, typical for multi-mode fibers. The maximum range is 4 km, with signal strength ensured by TX power of -10 to -20 dBm and RX reception range of -3 to -32 dBm. The link budget of 12 dB and dispersion penalty of 3 dB are crucial for stable transmission over the specified distance. Power supply is via a 3-pole terminal block with voltage of 12 to 48 VDC, including reverse polarity and overcurrent protection to prevent damage from incorrect connections.

Compatibility and Accessories

The device is compatible with standard Ethernet networks and multi-mode fiber optic cables with SC connectors. It can be used in combination with other devices from the IMC-21A series, which support different fiber types (single-mode, multi-mode) and connectors (SC, ST). The use of attenuators is recommended for single-mode applications, but is not required for this model.

Mounting and Installation

Mounting is done on a DIN rail, enabling quick and secure installation in enclosures. The housing is made of metal and provides IP30 protection, safeguarding against access by foreign objects larger than 2.5 mm and against splashing water. Installation requires no special tools, as configuration is done via DIP switches. Power supply is via a terminal block connected to a 12- to 48-V-DC source.

Operational Advantages

The operating temperature range of -40 to 75 °C makes the device suitable for extreme environments, such as those found in industrial plants or outdoor applications. EMC certifications according to EN 55032/35, FCC Part 15B, and CISPR 32, as well as EMS certifications according to IEC 61000-4-2 to -4-11, ensure high immunity to interference. Safety certification according to UL/EN 60950-1 and environmental tests according to IEC 60068-2-1/3, along with vibration certification according to IEC 60068-2-6, ensure reliable operation under mechanical and thermal stress. The MTBF is 353,000 hours according to MIL-HDBK-217F, indicating high service life.

Scope of Delivery

The scope of delivery includes the IMC-21A-M-SC-T media converter, a quick start guide, and a warranty card. The warranty period is 5 years.