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TP-Link TL-SM311LS Gigabit SFP Single-Mode Fiber Module

★★★★★4.7 (217 reviews)

Extend your fiber network up to 20km with the TP-Link TL-SM311LS single-mode Gigabit SFP module.

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*Price sourced from Amazon.com. Last updated:Jun 03, 2026.Price and availability are subject to change.

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Overview

The TP-Link TL-SM311LS is a Gigabit SFP (Small Form-factor Pluggable) transceiver module designed to provide long-distance network connectivity over single-mode fiber optic cable. Operating at a 1310nm wavelength with a data rate of 1.25Gbps in full-duplex mode, it bridges network segments separated by up to 20 kilometers using standard 9/125μm single-mode fiber with LC/UPC connectors. This makes it a practical solution for connecting buildings across a campus, linking remote offices, or extending a network backbone where copper cabling cannot reach.

The module is built for plug-and-play operation — simply insert it into a compatible SFP slot on a TP-Link JetStream switch or MC220L media converter and connect your fiber patch cable. There are no drivers to install or software to configure. TP-Link recommends pairing the TL-SM311LS with the MC210CS media converter for single-mode fiber connections. A protective dust plug is included to keep the optical bores clean when the module is not connected, and TP-Link advises keeping the plug in place until you are ready to make a connection to prevent contamination that could degrade signal quality.

Key Features

Single-Mode MiniGBIC module, Supports full-duplex

Wave Length: 1310nm. Data Rate: 1.25Gbps. Port Type: LC/UPC

Max. Cable Length: 12.4miles (20km) for 9/125um Single-Mode Fiber

Always keep the protective dust plug on the SFP’s optical bores until you are ready to make a connection

Compatible with all SFP ports on TP-Link product including JetStream switches, and media converter MC220L

Work with MC210CS with single mode fiber connection

Specifications

Brand
TP-Link
Model
TL-SM311LS
Module Type
Gigabit SFP (Mini-GBIC)
Fiber Type
Single-Mode (9/125μm)
Data Rate
1.25Gbps
Duplex
Full-Duplex
Wavelength
1310nm
Connector
LC/UPC
Max Cable Length
20km (12.4 miles)
Compatibility
TP-Link SFP-equipped switches, MC220L media converter

Pros & Cons

👍 Pros

  • 20km maximum reach makes it suitable for campus, inter-building, and metropolitan fiber links
  • Plug-and-play installation with no driver or software configuration required
  • Standard LC/UPC connector interface provides broad compatibility with common fiber patch cables
  • Compact SFP form factor fits into any standard SFP slot without blocking adjacent ports

👎 Cons

  • Officially supported only with TP-Link equipment, which may limit use in mixed-vendor environments
  • Single-mode fiber infrastructure is more expensive to install than multimode if not already in place
  • 1.25Gbps data rate does not support 10-Gigabit networking
  • Requires a matching SFP module at the remote end, adding to total deployment cost

Frequently Asked Questions

It requires 9/125μm single-mode fiber with LC/UPC connectors.
The TL-SM311LS supports distances up to 20km (12.4 miles) over single-mode fiber.
TP-Link specifies compatibility with all SFP ports on TP-Link products, including JetStream switches and the MC220L media converter. Compatibility with third-party equipment is not officially guaranteed.
Yes, the TL-SM311LS supports full-duplex Gigabit communication at 1.25Gbps.
It operates at a 1310nm wavelength, which is standard for single-mode SFP modules at this distance range.

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