The TP-Link SM311LM (TL-SM311LM) is a compact and high-performance 1000Base-SX Mini GBIC module designed for reliable short-range fiber networking in enterprise, education, and data center environments. Built for multi-mode fiber and equipped with LC/UPC connectors, this transceiver delivers Gigabit-speed data transmission up to 550 metres over OM2/OM3 fibers.

Engineered for compatibility and scalability, the SM311LM adheres to the SFP Multi-Source Agreement (MSA) and supports hot-swapping, making it easy to upgrade or replace without disrupting network operations. Integrated Digital Diagnostic Monitoring (DDM) functionality ensures real-time monitoring of power, temperature, and voltage levels.

What’s in the Box

• SM311LM SFP Module (TL-SM311LM)

• Installation Guide

Main Features

✅ Supports Gigabit speeds (1.25 Gbps) over multi-mode fiber
✅ Up to 550m transmission distance with OM2/OM3 fiber
✅ 850 nm wavelength, optimized for short-range MMF deployments
✅ Fully hot-swappable for seamless maintenance
✅ DDM support for real-time diagnostics
✅ LC/UPC Duplex port ensures low insertion loss
✅ Compliant with IEEE 802.3z and SFP-MSA standards
✅ Plug-and-Play functionality—no configuration required

Detailed Specifications

Data Rate

• 1.25 Gbps

Wavelength

• 850 nm

Fiber Type

• 50/125μm or 62.5/125μm Multi-Mode Fiber (OM2/OM3)

Max. Cable Length

• Up to 550m

Port Type

• LC/UPC Duplex

Standards & Protocols

• IEEE 802.3z

• TCP/IP

• CSMA/CD

• SFP-MSA compliant

DDM Support

• Yes (Digital Diagnostic Monitoring)

Hot Swappable

• Yes

Power Supply

• 3.3V

Dimensions (W x D x H)

• 2.2 × 0.5 × 0.5 in (55.4 × 13.7 × 12.9 mm)

Certifications

• FCC, CE

Warranty Information

Manufactures warrenty applied .

Brand Description

TP-Link Omada is a trusted leader in enterprise networking, offering solutions that combine advanced functionality, industry standards, and superior compatibility. The SM311LM adds flexible, high-bandwidth fiber connectivity to compatible network switches and routers, enhancing speed, reliability, and efficiency in professional deployments.

SKU

SM311LM (TL-SM311LM)

Practical Use Scenarios

🏢 Enterprise LAN Segments – Enable high-speed communication between server rooms and wiring closets
🏫 Campus Building Interconnects – Short-range MMF links between floors or buildings
📶 Wi-Fi 6 Access Points – Supply high-bandwidth backhaul to indoor network infrastructure
📡 Media or CCTV Backbone – Link PoE switches in AV/security systems with gigabit performance

Datasheets / Downloadable Resources

📄SM311LM datasheets 

Excellence for the Australian and New Zealand Market

The TP-Link SM311LM meets the stringent quality standards and environmental compliance required in Australia and New Zealand. This module is certified by CE and FCC, supplied via authorized local distributors, and built to withstand the operating conditions typical of data centers and office environments across ANZ. Warranty claims and replacements are handled through local support partners, ensuring seamless integration and service continuity.

 FAQs

Q1. What is the maximum transmission range of the SM311LM module? (SM311LM)
The SM311LM supports up to 550 meters over multi-mode fiber (OM2 or OM3).

Q2. Is the SM311LM SFP transceiver hot-swappable? (SM311LM)
Yes, it is fully hot-swappable, making installation or upgrades quick and disruption-free.

Q3. Does SM311LM support DDM functionality? (SM311LM)
Yes, the SM311LM features Digital Diagnostic Monitoring (DDM) to help monitor temperature, voltage, and signal quality.

Q4. What fiber type does SM311LM support? (SM311LM)
It supports 50/125μm or 62.5/125μm multi-mode fiber, making it ideal for short-range fiber deployments.

Q5. Which TP-Link devices are compatible with SM311LM? (SM311LM)
Any SFP-MSA compatible TP-Link Omada switch or router with an SFP port, such as TL-SG3428X, TL-SG3452X, and others, will support the SM311LM.