General
Transmission distance	4 km
Wavelength	1300 nm
Dispersion penalty	3 dB

The IMC-21-M-ST from Moxa is an industrial media converter that converts Ethernet signals in the 10/100BaseT(X) standard via RJ45 connector into 100BaseFX fiber optic signals. It is specifically designed for use in harsh industrial environments where a reliable and cost-effective network connection over long distances is required. The device features an ST connector for multi-mode fibers and enables a maximum transmission distance of 4 km. Configuration is done via DIP switches, which set the operating mode (FDX/HDX), speed (10/100), and mode (Auto/Force). The Link Fault Pass-Through (LFPT) function ensures that network disruptions on the fiber side are also indicated on the Ethernet side, simplifying troubleshooting.

Applications

The IMC-21-M-ST is suitable for decentralized network applications in enclosures, distributors, or industrial control systems. It is commonly used in production facilities, power supply networks, or transportation technology, where a stable connection via fiber optic cables is necessary to avoid electromagnetic interference and increase range. DIN rail mounting allows for easy integration into existing enclosure environments.

Functions and Equipment in Detail

The device features an RJ45 connector for Ethernet connection, supporting Auto-Negotiation and Auto-MDI/MDI-X, so no manual switching is required. The ST connector for multi-mode fibers is designed for a wavelength of 1300 nm. Optical characteristics include a TX power of -10 to -20 dBm and an RX reception range of -3 to -32 dBm. The link budget is 12 dB, enabling the maximum distance of 4 km. The dispersion penalty is 3 dB, typical for multi-mode systems.

Technology Explained Simply

The media converter converts electrical Ethernet signals into optical signals transmitted over fiber optic cables. This enables longer reach and higher immunity to electromagnetic interference compared to copper cables. Power supply is provided via a flexible voltage range of 12 to 48 VDC, allowing adaptation to various industrial power sources. An integrated overcurrent protection safeguards the device against damage from excessive current draw.

Compatibility and Accessories

The IMC-21-M-ST is compatible with multi-mode fiber optic cables and supports the ST connector. It can be integrated into existing networks supporting 10/100BaseT(X) and 100BaseFX. Configuration is done via DIP switches, so no additional software or network management tools are required. No special adapters or additional components are needed for connection to other devices.

Mounting and Installation

The device is installed via DIN rail mounting, enabling quick and secure fixation in enclosures. The compact plastic housing with dimensions 25 x 109 x 97 mm and a weight of 125 g is designed for use in limited space. The IP30 protection rating protects against finger contact and falling objects, but is not suitable for outdoor use or humid environments.

Operational Advantages

The IMC-21-M-ST offers a reliable and low-maintenance solution for fiber optic integration in industrial networks. Simple configuration via DIP switches reduces installation time. The flexible power supply range of 12 to 48 VDC enables use in various industrial environments. The high MTBF of 353,000 hours (according to MIL-HDBK-217F) demonstrates the device's high reliability. Certifications according to EN 55032/24, FCC Part 15B, CISPR 32, IEC 61000-4-2 to -4-11, UL/EN 60950-1, and IEC 60068-2-1/2/3, as well as vibration tests according to IEC 60068-2-6, confirm suitability for industrial applications. The operating temperature of -10 to 60 °C and storage temperature of -40 to 70 °C allow use in a wide range of environments. Humidity of 5 to 95 % (non-condensing) is also suitable for industrial applications. The device is delivered with a quick start guide and a warranty card covering a 5-year manufacturer's warranty.

Scope of Delivery

The scope of delivery includes one IMC-21 media converter, a quick start guide, and a warranty card.