Product Overview
The TP-Link TL-SM311LM Mini-GBIC Module is a compact and cost-effective Gigabit SFP (Small Form-Factor Pluggable) transceiver designed for short-distance fiber networking using multi-mode fiber (MMF). It is ideal for environments where devices are relatively close—such as within the same building, office floor, or campus—while still requiring the speed and reliability of fiber connections.
Short-Range Fiber Connectivity – Ideal for Indoor Networks
The TL-SM311LM is optimized for multi-mode fiber, making it perfect for short to medium distances:
Up to 550 meters (1800 ft) on 50/125µm fiber
Up to 275 meters (900 ft approx.) on 62.5/125µm fiber
This makes it a practical solution for:
Office networking between floors
Data center rack-to-rack connections
Campus buildings within close proximity
Gigabit Speed for Stable Performance
Supporting 1.25Gbps (Gigabit Ethernet), the module ensures smooth and reliable data transmission for:
File sharing and internal networks
CCTV and surveillance systems
Business applications and VoIP
It complies with IEEE 802.3z standards, ensuring compatibility with most Gigabit SFP-enabled switches and networking devices.
Multi-Mode Fiber – Cost-Effective & Practical
Unlike single-mode modules (used for long distances), this module uses multi-mode fiber, which offers:
Lower installation cost
Easier deployment for short runs
High performance in LAN environments
It’s the go-to choice when you don’t need long-distance transmission.
Plug-and-Play with Hot-Swappable Design
The TL-SM311LM is hot-swappable, allowing you to install or remove it without shutting down your switch. This provides:
Minimal downtime
Easy upgrades and maintenance
Flexible deployment
It also follows SFP-MSA standards, ensuring wide compatibility across TP-Link and other networking brands.
Reliable Build & Monitoring Features
Designed for consistent operation, the module includes:
850nm wavelength for efficient MMF transmission
Digital Diagnostic Monitoring (DDM) for tracking temperature and voltage
Durable compact design with stable performance
It operates within 0°C to 70°C, making it suitable for server rooms and network cabinets.
Best Use Cases
This module is best suited for:
Small to medium business networks
Internal fiber links within buildings
Connecting switches in offices or campuses
CCTV backbone systems
Key Specifications
Type: 1000Base-SX Mini-GBIC (SFP) Module
Data Rate: Up to 1.25Gbps
Fiber Type: Multi-mode (50/125µm, 62.5/125µm)
Wavelength: 850 nm
Max Distance:
Up to 550m (50/125µm)
Up to ~275m (62.5/125µm)
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-enabled switches, routers, media converters
Use Cases: Office networks, short-range fiber links, CCTV systems
The TP-Link TL-SM311LM is the best choice for affordable, short-range fiber networking. If your devices are within the same building or campus, it delivers reliable Gigabit performance at a lower cost than long-range modules.