General
Wavelength	1310 nm
Dispersion penalty	1 dB
Input voltage	12–48 VDC
IP protection rating	IP30
Air humidity	5–95 % (nicht kondensierend)

The IMC-21-S-SC from Moxa is a media converter for industrial networks, enabling the conversion of 10/100BaseT(X) Ethernet via RJ45 connector to 100BaseFX fiber optic via an SC connector. It is specifically designed for applications requiring a cost-effective and reliable connection between copper and fiber optic cables in demanding environments. The series is characterised by simple DIN rail mounting and robust operation across wide temperature and voltage ranges.

Applications
This converter is suitable for industrial networks where extending the range via fiber optic cables is necessary, for example in production facilities, power supply installations, or transportation infrastructure. The maximum transmission range of up to 40 km with single-mode fiber optic makes it particularly suitable for long distances where copper cables are no longer sufficient due to signal loss. The operating temperature of -10 to 60 °C ensures functionality in indoor and outdoor environments, provided the environment is not humid or dusty.

Functions and Features in Detail
The IMC-21-S-SC features DIP switches that allow manual configuration of duplex mode (FDX/HDX), speed (10/100 Mbit/s), and operating mode (Auto/Force). These configuration options increase flexibility when integrating into existing networks. An integrated Link Fault Pass-Through (LFPT) ensures that in the event of a fiber optic link failure, the Ethernet port at the other end is also deactivated to prevent network disruptions.

Technology Explained Simply
Optical transmission operates in single-mode mode with a wavelength of 1310 nm, enabling high range and low attenuation. The TX power ranges from 0 to -5 dBm, while the RX reception handles values from -3 to -34 dBm. The link budget is 29 dB, indicating the maximum attenuation in the transmission channel. The dispersion penalty of 1 dB is low and supports signal quality over long distances. For single-mode applications, a attenuator is recommended to ensure signal integrity.

Compatibility and Accessories
The converter is compatible with standard 10/100BaseT(X) Ethernet networks and single-mode fiber optic cables with SC connectors. It can be combined with other models from the IMC-21-S series, for example with multi-mode variants, to connect different network segments. Power supply is via 12–48 VDC, enabling flexible integration into existing industrial power systems. The integrated overcurrent protection safeguards the device against damage from voltage surges.

Mounting and Installation
Mounting is done on a DIN rail, enabling quick and secure installation in enclosures. The housing is made of plastic and features an IP30 protection rating, protecting against access by foreign objects, but not against water or dust. Dimensions are 25 x 109 x 97 mm, and weight is 125 g. Installation requires no special tools, as DIN rail mounting is standardised.

Operational Advantages
The IMC-21-S-SC offers high operational reliability due to its wide voltage range and robust construction. The MTBF is 353,000 hours according to MIL-HDBK-217F, indicating high reliability. Certifications to EN 55032/24, FCC Part 15B, CISPR 32, IEC 61000-4-2 to -4-11, and UL/EN 60950-1 confirm compliance with EMC, safety, and environmental standards. The 5-year manufacturer's warranty underscores the product's quality.

Scope of Delivery
The scope of delivery includes the IMC-21-S-SC media converter, a quick start guide, and a warranty card.