MikroTik S-31DLC20D 1.25G Single Mode 20km SFP Transceiver

The MikroTik S-31DLC20D is an industrial-grade 1.25G SFP optical transceiver designed for long-range Gigabit Ethernet deployments. Engineered for reliability in high-density networking environments, this module operates over single-mode fiber (SMF) using a 1310nm wavelength. It is a critical component for network engineers managing campus backbones, metropolitan area networks (MANs), or ISP last-mile connectivity where distances exceed the limitations of multi-mode fiber. This transceiver provides a stable 1.25Gbps throughput over distances up to 20km, effectively bridging the gap between remote branch offices and central data centers.

It features a standard Dual LC connector interface, ensuring compatibility with a wide range of patch cables and distribution frames. A key technical advantage is the inclusion of Digital Diagnostic Monitoring (DDM), which allows administrators to monitor real-time parameters such as optical output power, input power, temperature, and transceiver supply voltage. The S-31DLC20D is optimized for MikroTik hardware, including the Cloud Core Router (CCR) and Cloud Router Switch (CRS) series, but maintains broad compatibility with MSA-compliant third-party equipment. Its robust design is rated for extended temperature ranges, making it suitable for edge deployments in non-climate-controlled enclosures or outdoor networking cabinets.