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Two small silver SFP transceivers with LC connectors side by side

Mikrotik

Mikrotik S-3553LC20D SFP Transceiver Pair 1.25G 20km LC

SKU CH-Q3WB-P1Q7K MPN S-3553LC20D

A pair of 1.25G single-mode SFP transceivers with LC connectors for links up to 20km, supporting DDM and tested from -40 to +70C

  • Pair of matched SFP transceivers for simple bi-directional links
  • 25 Gbps single-mode optics reach 20 km over one fibre strand
  • Digital diagnostic monitoring gives real-time link health data
  • LC UPC connectors ensure low-loss, reliable patching
  • Qualified on MikroTik RouterBOARD and CCR platforms for plug-and-play use

Transceiver pair for 20 km links

This product contains two matched SFP modules that operate at 1.25G over single-mode fibre with LC UPC connectors. One unit transmits at 1310 nm and receives at 1550 nm while the other reverses those wavelengths, enabling a bidirectional link up to 20 km. Both modules support digital diagnostic monitoring and are rated for ambient temperatures from -40 to +70 °C. The pair is tested for use with several MikroTik switches and routers.

SFP slot requirements and fibre savings

Each module fits a standard SFP cage, so the host device must provide two available SFP ports. Using this wavelength-division pair allows a single fibre strand to carry traffic in both directions, freeing the second strand for other links or redundancy. The transceivers are also compatible with non-MikroTik SFP equipment that accepts the same single-mode LC interface and 1.25G data rate.

DDM and tested device list

Digital diagnostic monitoring lets administrators track optical power, temperature, voltage and bias current in real time without extra tools. The manufacturer confirms compatibility with the RB260GS, RB2011 series and CCR1036-12G-4S, simplifying deployment in those platforms. No additional software or licences are bundled with the transceivers.

Highlights

  • Pair of matched SFP transceivers for simple bi-directional links
  • 25 Gbps single-mode optics reach 20 km over one fibre strand
  • Digital diagnostic monitoring gives real-time link health data
  • LC UPC connectors ensure low-loss, reliable patching
  • Qualified on MikroTik RouterBOARD and CCR platforms for plug-and-play use

Specifications

ModelS-3553LC20D

Questions about this item

How far can the S-35LC20D and S-53LC20D transceivers reliably link over single-mode fibre?

Both modules are rated for 20 km reach on single-mode fibre using LC UPC connectors.

What is the tested operating temperature range for the transceiver pair?

The pair is tested for continuous operation from -40 °C to +70 °C ambient temperature.

Which MikroTik routers and switches have been tested for compatibility with this SFP pair?

Tested units include RB260GS, RB2011LS, RB2011LS-IN, RB2011UAS-IN, RB2011UAS-RM, RB2011UAS-2HnD, RB2011UAS-2HnD-IN and CCR1036-12G-4S.

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