MikroTik XS+31LC40D – 1G/10G/25G SFP28 Single-Mode 40km LC Module

The MikroTik XS+31LC40D is a multi-rate SFP/SFP+/SFP28 optical module built for long-distance single-mode fiber connections. Supporting 1.25G, 10G and 25G in a single module with a reach of up to 40 km, it is a practical choice for connecting distant network sites, expanding ISP infrastructure and building high-speed links across longer routes — without giving up flexibility.

1G, 10G or 25G – Now Up to 40 km

Operating at 1310 nm over single-mode fiber with a Dual LC UPC connector, the XS+31LC40D extends your fiber links up to 40 km. Run 1G or 10G links today and move to 25G when the connected equipment supports it — without replacing the optical module.

Built-in Digital Diagnostics (DDM)

The module includes built-in digital diagnostic monitoring for optical power, voltage, temperature, laser bias current and other key parameters. These functions help detect abnormal activity or when customizable operating limits are exceeded, making it easier to plan ahead and schedule upgrades or maintenance based on real performance data.

Where Can You Use It?

• ISP distribution and aggregation – connect distant points of presence, distribution switches and network aggregation sites over single-mode fiber.
• Remote facilities and industrial networks – extend high-speed connectivity to offices, production facilities and other locations separated by long fiber routes.
• Flexible network upgrades – start at 1G or 10G and scale to 25G on the same module.

Example MikroTik Companions

• CRS310-8G+2S+IN – compact switch with two 10G SFP+ ports for distribution and remote-site connections.
• CCR2004-1G-12S+2XS – versatile router with twelve 10G SFP+ and two 25G SFP28 ports for mixed-speed networks.
• CRS510-8XS-2XQ-IN – high-capacity switch with eight 25G SFP28 ports and two 100G QSFP28 ports for aggregation infrastructure.

Key Specifications at a Glance:

• Product Code: XS+31LC40D
• Format: SFP / SFP+ / SFP28
• Data Rate: 1G / 10G / 25G
• Connector: Dual LC UPC
• Mode: Single-mode
• Wavelength: 1310 nm
• Distance: up to 40 km
• Transmitter output power: -1 to +5 dBm
• Receiver sensitivity (OMA): -19.6 dBm (25.78G, BER 5E-5)
• Diagnostics: DDM (optical power, voltage, temperature, laser bias current)
• Max Power Consumption: 1.8 W
• Operating Temp: -40°C to +70°C

Important Compatibility Notice:

This is a single-mode 1310 nm module and must be paired with a matching single-mode 1310 nm module (such as another XS+31LC40D) at the far end. 25G operation requires an SFP28 port on both ends; in SFP+ or SFP ports it runs at 10G or 1.25G. Please confirm your fiber type, link distance and port speed before purchasing.

If you would like to test the device, our return period is 7 days. The product must be returned in good condition with all original parts, accessories, and retail packaging. Incomplete or damaged returns may be subject to a restocking fee of up to 30%.