Network transceiver module MikroTik S-31DLC20D SFP 1310 nm 1250 Mbit/s 20 km LC

S-31DLC20D is a 1.25G SFP transceiver operating at 1310 nm with a dual LC connector, designed for single-mode fiber links up to 20 km. The module supports digital diagnostic monitoring (DDM) and provides a 1250 Mbit/s interface for integration into network equipment compatible with SFP ports.

Advantages

The MikroTik S-31DLC20D offers a compact SFP form factor with DDM support and a standardized LC duplex connector, ensuring straightforward installation and monitoring. With a 20 km single-mode reach and a 1.25G data rate, it is suitable for extending Ethernet links over optical fiber while maintaining compatibility with many MikroTik devices and third-party SFP-capable equipment.

Suitable for

• Extending Ethernet links over single-mode fiber up to 20 km
• Replacement or upgrade of SFP ports in MikroTik routers and switches (e.g., RB260GS, RB2011 series, CCR1036-12G-4S)
• Interoperable connections with non-MikroTik SFP devices that support 1.25G 1310 nm LC transceivers

Key specifications

• Form factor: SFP
• Data rate: 1.25 Gbit/s (1250 Mbit/s)
• Wavelength: 1310 nm
• Connector: Dual LC (duplex)
• Maximum link distance: up to 20 km (single-mode fiber)
• Features: Digital Diagnostic Monitoring (DDM)
• Manufacturer part number (MPN): S-31DLC20D

How to use

Insert the S-31DLC20D module into an SFP slot of a compatible switch or router while the device is powered on or as recommended by the equipment vendor. Connect single-mode LC duplex fiber patch cables to the module’s LC ports, observing transmit/receive orientation. Check device interface status and DDM readings via your equipment’s management interface to verify link integrity and optical parameters.

Recommendations

Use certified single-mode LC patch cables and follow your network equipment vendor’s guidelines for hot-plugging. Verify compatibility with the target device model list and monitor DDM values for early detection of optical link issues.