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

The MikroTik S-31DLC20D is a 1.25G SFP transceiver for single-mode fiber, using a 1310nm laser and dual LC connector for Gigabit links of up to 20 km, with DDM monitoring. It suits network engineers, IT teams and integrators building fiber links.

Plug in, link up.

Longer Fiber Links Without Compatibility Guesswork

Copper Ethernet stops at about 100 meters, and uncoded optics may not be accepted by the switch they are meant for.

Digital diagnostic monitoring (DDM) reports temperature, voltage and optical power, so links can be checked from the router or switch.

Optical Specifications

1.25 Gbps Gigabit SFP: Gigabit fiber links for routers and switches. Up to 20 km reach: Connects buildings, sites and long campus runs.

Installation and Compatibility

1310nm, dual LC: Standard single-mode optics and duplex patch cables. DDM monitoring: Check temperature and optical power from RouterOS or SwOS. Hot-swappable: Install or replace without powering down the device.

Setup Instructions

How to Set Up the MikroTik S-31DLC20D 1.25G SFP Single-Mode 20km Transceiver

1. Confirm that the host port supports this module type and speed.
2. Remove the dust cap and insert the module until it latches.
3. Connect clean single-mode LC patch cables, matching the module type on the far end.
4. Check the link LED and module diagnostics in the switch or router interface.