SM311LS | TP-Link 1000Base-LX Single-Mode SFP Module – 20 km Fiber Reach

The TP-Link SM311LS (TL-SM311LS) is a 1000Base-LX Mini GBIC SFP transceiver module engineered for long-distance, high-speed single-mode fiber communication. Supporting up to 1.25 Gbps data rate and compliant with the IEEE 802.3z standard, this hot-swappable module ensures maximum flexibility and minimal downtime for your network upgrades.

Designed for up to 20 km transmission over 9/125μm single-mode fiber, the SM311LS is ideal for enterprise backbones, long-distance campus networks, and fiber-based service provider deployments. The built-in Digital Diagnostic Monitoring (DDM) offers real-time metrics for troubleshooting and performance monitoring, while full SFP-MSA compatibility ensures wide support across TP-Link and third-party devices.

What's in the Box

• SM311LS SFP Module (TL-SM311LS)

• Installation Guide

Main Features

✅ Long-distance fiber transmission up to 20 km
✅ 1.25 Gbps Gigabit SFP for single-mode fiber
✅ Complies with SFP-MSA and IEEE 802.3z standards
✅ Integrated Digital Diagnostic Monitoring (DDM)
✅ LC Duplex port with 1310 nm wavelength
✅ Plug-and-play, hot-swappable design for zero downtime installation
✅ Ideal for TP-Link Omada switches and compatible fiber-ready devices

Detailed Specifications

Transceiver Type

• 1000Base-LX Mini GBIC SFP Module

Data Rate

• 1.25 Gbps

Wave Length

• 1310 nm

Fiber Type

• 9/125μm Single-Mode

Max. Transmission Distance

• 20 km

Port Type

• LC Duplex

Hot Swappable

• Yes

DDM Support

• Yes (Digital Diagnostic Monitoring)

Standards & Protocols

• IEEE 802.3z

• TCP/IP

• SFP-MSA (Multi-Source Agreement)

Power Supply

• 3.3V

Dimensions

• 2.2 × 0.6 × 0.5 in (55.4 × 14.6 × 12.9 mm)

Certifications

• FCC, CE

Warranty Information

The SM311LS module is backed by TP-Link’s standard manufacturer warranty and is supported through authorized Australian and New Zealand distributors.

Brand Description

TP-Link Omada is a globally trusted networking brand delivering enterprise-class fiber and Ethernet solutions. Known for seamless integration and broad compatibility, TP-Link transceivers like the SM311LS deliver stable, scalable, and secure optical connectivity to enterprises, government, education, and telco sectors.

SKU

SM311LS (TL-SM311LS)

Practical Use Scenarios

🏢 Long-Distance Office Uplinks – Interconnect remote buildings up to 20 km apart
📡 Service Provider Access Networks – Reliable fiber connectivity over long runs
🛡 Security Camera Infrastructure – Extend high-speed links to IP surveillance nodes
🏫 Educational Campus Backbones – Optimize high-bandwidth learning environments
🖧 Metro Fiber Loops – Designed for multi-site 1G connectivity across cities

Datasheets / Downloadable Resources

📄 Product Datasheet 

Excellence for the Australian and New Zealand Market

The SM311LS is fully compliant with CE, FCC, and RoHS standards, meeting the regulatory and operational expectations for deployment in Australia and New Zealand. Sourced directly from TP-Link's authorized ANZ channels, this SFP module ensures genuine product support, local warranty handling, and optimal performance in temperate and high-humidity environments common in the region.

 FAQs

Q1. What is the maximum transmission distance of the SM311LS? (SM311LS)
The SM311LS supports up to 20 km of transmission over 9/125μm single-mode fiber.

Q2. Is the SM311LS SFP module hot-swappable? (SM311LS)
Yes, the SM311LS is fully hot-pluggable, allowing seamless upgrades and replacements without restarting the device.

Q3. Does the SM311LS support Digital Diagnostic Monitoring? (SM311LS)
Yes, the module includes DDM to provide real-time performance monitoring of voltage, temperature, and optical power levels.

Q4. Is SM311LS compatible with all SFP slots? (SM311LS)
The SM311LS is compliant with the SFP Multi-Source Agreement (MSA), ensuring broad compatibility with most standard SFP ports.

Q5. What wavelength does the SM311LS operate on? (SM311LS)
The module operates on a 1310 nm wavelength, optimized for long-distance single-mode communication.