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

Description

The MikroTik S-31DLC20D is a 1.25G single-mode SFP optical transceiver designed for reliable fibre-optic Ethernet connectivity over distances of up to 20 kilometres. Operating at a wavelength of 1310nm, this module is suitable for internet service providers, enterprise networks, fibre distribution systems and other installations that require dependable long-distance optical links.

Designed for devices equipped with compatible SFP ports, the MikroTik S-31DLC20D provides a practical way to connect routers, switches and fibre network equipment over single-mode optical fibre. It is particularly useful for network operators extending connectivity between buildings, connecting distribution points and establishing fibre links between network locations.

20km Single-Mode Fibre Connectivity

The S-31DLC20D supports optical connections over single-mode fibre for distances of up to 20km under suitable installation conditions. This makes it appropriate for many metropolitan networks, ISP distribution links, enterprise campus connections and point-to-point fibre infrastructure.

Actual achievable distance and link performance depend on fibre quality, connector cleanliness, optical loss, splices, patch panels and the specifications of the equipment at both ends. Always confirm the optical link budget and compatibility before deployment.

1.25G Data Rate and 1310nm Wavelength

This transceiver supports a data rate of 1.25G and operates at a wavelength of 1310nm. It is intended for compatible 1 Gigabit-class SFP connectivity and is suitable for fibre network equipment that supports the corresponding optical interface.

Before purchasing, verify that the host device supports the SFP form factor and the required data rate. An SFP module should not be confused with a 10G SFP+ transceiver; the S-31DLC20D is a 1.25G SFP model.

Dual LC UPC Connector

The module uses a dual LC UPC optical connector interface for duplex fibre connections. A compatible duplex single-mode fibre patch cord is required. Ensure the fibre polarity is correct so that the transmit signal from one end reaches the receive port at the other end.

For a conventional duplex link using two S-31DLC20D modules, install a compatible module at each end of the fibre connection. Confirm the interface specifications and supported optical characteristics of the equipment on both sides before connecting the link.

Digital Diagnostic Monitoring

The S-31DLC20D includes digital diagnostic monitoring (DDM), allowing supported host equipment to monitor optical module information. Depending on the host device and software support, diagnostic readings can help network administrators assess link conditions and troubleshoot optical connectivity issues.

Compatibility with MikroTik and Other SFP Devices

MikroTik identifies the S-31DLC20D as tested with selected MikroTik products and states that it is compatible with non-MikroTik SFP devices as well. Compatibility still depends on the host equipment, port configuration and vendor-specific requirements. Check the relevant device documentation before ordering modules for mixed-vendor installations.

For network operators, using a suitable SFP module can simplify fibre deployment and help connect compatible equipment without replacing the entire network device. It can support links in ISP infrastructure, enterprise switching environments and other fibre-based Ethernet networks.

Operating Conditions and Reliability

The S-31DLC20D has a specified tested ambient operating temperature range of -40°C to +70°C. MikroTik lists an approximate mean time between failures (MTBF) of 100,000 hours at 25°C. MTBF is a statistical reliability estimate, not a guarantee of the service life of an individual module.

Installation should be carried out by personnel familiar with fibre-optic equipment. Keep optical connectors clean, avoid looking into active optical ports and follow the host device manufacturer’s installation instructions.

Buy MikroTik S-31DLC20D from Globikom Kenya

Globikom supplies networking, connectivity and IT infrastructure equipment for businesses, internet service providers, system integrators and network operators in Kenya and across Africa. The MikroTik S-31DLC20D is an option for customers seeking a 1.25G single-mode SFP transceiver for compatible fibre links of up to 20km.

Contact Globikom to confirm current stock, pricing, compatibility requirements and delivery arrangements for your location. When ordering, provide the host device model and the fibre distance so that the correct optical module can be selected for your network.

Key Specifications

Brand: MikroTik
Model: S-31DLC20D
Product type: SFP optical transceiver
Data rate: 1.25G
Fibre mode: Single-mode (SM)
Maximum specified link distance: Up to 20km
Wavelength: 1310nm
Connector: Dual LC UPC
Digital diagnostics: DDM
Tested ambient temperature: -40°C to +70°C
MTBF: Approximately 100,000 hours at 25°C

Confirm host-device compatibility and the optical link budget before deployment.