Product Overview
TP-Link TL-SM311LS Mini-GBIC Single-Mode Module
The TP-Link TL-SM311LS Mini-GBIC (SFP) Module is a dependable and cost-effective solution for extending your network over long distances using single-mode fiber. Designed for Gigabit networking, it converts standard SFP ports on switches and media converters into fiber optic connections, making it ideal for businesses, campuses, and installations that require stable long-range connectivity.
Long-Distance Fiber Connectivity – Up to 20km
One of the key strengths of the TL-SM311LS is its ability to transmit data over distances of up to 20 km using 9/125µm single-mode fiber cables.
This makes it perfect for:
Connecting buildings across large campuses
Linking remote offices or branches
Backbone network infrastructure
Compared to copper Ethernet, it offers significantly greater reach with minimal signal loss.
Gigabit Performance for Reliable Networking
The module supports data transfer speeds of up to 1.25Gbps (Gigabit Ethernet), ensuring smooth and stable communication for:
Office networks
CCTV and surveillance systems
ISP and enterprise connectivity
It operates on the IEEE 802.3z standard, ensuring compatibility with most Gigabit SFP-enabled devices.
Single-Mode Fiber – Stable & Future-Proof
Using single-mode fiber, the TL-SM311LS provides:
Lower attenuation over long distances
More stable signal transmission
Better scalability for expanding networks
This makes it a strong choice for users planning long-term infrastructure.
Plug-and-Play with Hot-Swappable Design
The module is hot-swappable, allowing installation or removal without powering down your equipment. This means:
Minimal downtime
Easy upgrades or replacements
Flexible deployment in live networks
It also complies with SFP-MSA standards, ensuring compatibility across a wide range of switches and networking equipment.
Digital Diagnostic Monitoring (DDM)
The TL-SM311LS includes DDM support, allowing real-time monitoring of:
Temperature
Voltage
This helps maintain network stability and simplifies troubleshooting in professional environments.
Compact, Durable & Efficient
With its compact SFP form factor and metal housing, the module is built for durability and efficient operation. It supports an operating temperature range of 0°C to 70°C, making it suitable for various environments including server rooms and network cabinets.
Key Specifications
Type: 1000Base-LX Mini-GBIC (SFP) Module
Data Rate: Up to 1.25Gbps
Fiber Type: Single-mode (9/125µm)
Wavelength: 1310 nm
Max Distance: Up to 20 km
Connector: LC Duplex
Standards: IEEE 802.3z, SFP-MSA
Features: Hot-swappable, Plug-and-play, DDM support
Operating Temperature: 0°C to 70°C
Power Supply: 3.3V
Compatibility: SFP ports on switches, routers, media converters
Use Cases: Campus networks, enterprise links, ISP connections, CCTV backbone
The TP-Link TL-SM311LS is a reliable and budget-friendly Gigabit fiber module for users who need long-distance connectivity without moving to expensive 10G solutions. It’s ideal for expanding networks across buildings or large areas while maintaining stable performance.