TP-Link TL-SM311LM - Gigabit Multi-Mode SFP Module
The TP-Link TL-SM311LM is a Gigabit multimode SFP transceiver module designed to add short-range fiber connectivity to compatible TP-Link switches, media converters, and other equipment with standard SFP interfaces. Using an 850 nm optical signal and a duplex LC fiber connection, the module provides reliable 1000BASE-SX connectivity for business networks, switch uplinks, network closets, campus environments, surveillance infrastructure, and other applications where fiber is preferred over copper.
TL-SM311LM supports a 1.25 Gbps optical signaling rate and can reach up to 550 meters with compatible 50/125 ?m multimode fiber or up to approximately 275 meters with 62.5/125 ?m multimode fiber. Current SM311LM hardware also supports Digital Diagnostic Monitoring, SFP-MSA compatibility, and hot-swappable installation, allowing installers to deploy and service fiber links without unnecessary equipment downtime.
Key Features
- TP-Link Gigabit multimode SFP / MiniGBIC transceiver module
- Model TL-SM311LM / current SM311LM naming
- 1000BASE-SX Gigabit Ethernet fiber connectivity
- 1.25 Gbps optical signaling rate
- 850 nm wavelength
- Duplex LC fiber interface
- Designed for multimode fiber
- Supports 50/125 ?m multimode fiber
- Supports 62.5/125 ?m multimode fiber
- Up to 550 m transmission distance with compatible 50/125 ?m multimode fiber
- Up to approximately 275 m with compatible 62.5/125 ?m multimode fiber
- IEEE 802.3z compliant
- SFP-MSA compatible on current hardware
- Digital Diagnostic Monitoring on current hardware
- Hot-swappable design on current hardware
- Compact MiniGBIC / SFP form factor
- 3.3V operating supply on current datasheet
- Commercial operating temperature range of 0°C to 70°C
- Compatible with supported TP-Link SFP-equipped switches
- Compatible with TP-Link MC220L media converter
- Suitable for Gigabit switch-to-switch fiber links
Applications & Use Cases
- Gigabit fiber switch uplinks
- Building-to-building network connections
- Network closet interconnects
- Business and enterprise LANs
- Campus networks
- Fiber-connected surveillance networks
- Network video recorder infrastructure
- Industrial and manufacturing networks
- Server and equipment-room connectivity
- Replacing longer copper Ethernet runs
- Electrical isolation between network segments
- Switch-to-switch fiber connections
- Media converter applications
- TP-Link MC220L deployments
- Short-range multimode fiber links
Technical Specifications
Optical & Ethernet
- Ethernet Standard: 1000BASE-SX
- Standards & Protocols: IEEE 802.3z, CSMA/CD, TCP/IP
- Data Rate: 1.25 Gbps
- Wavelength: 850 nm
- Fiber Mode: Multimode
- Fiber Interface: Duplex LC
- Connector Type: LC / UPC
- Fiber Count: Dual Fiber
Fiber Compatibility & Distance
- Supported Fiber: 50/125 ?m Multimode
- Supported Fiber: 62.5/125 ?m Multimode
- Maximum Published Distance: Up to 550 m
- 50/125 ?m Multimode: Up to 550 m
- 62.5/125 ?m Multimode: Up to Approximately 275 m
Hardware Features
- Form Factor: SFP / MiniGBIC
- SFP-MSA: Supported on Current Hardware
- Digital Diagnostic Monitoring: Supported on Current Hardware
- Hot Swappable: Supported on Current Hardware
- Maximum Laser Output Power: 1 mW / 0 dBm on Current Datasheet
- Power Supply: 3.3 V on Current Datasheet
Physical
- Dimensions: 55.4 × 13.7 × 12.9 mm / 2.2 × 0.5 × 0.5 in
- Installation: SFP Slot
- Removal: Hot-Swappable with Supported Equipment
Environment
- Operating Temperature: 0°C to 70°C / 32°F to 158°F
- Storage Temperature: -40°C to 85°C / -40°F to 185°F on Current Datasheet
- Operating Humidity: 10% to 90% RH, Non-Condensing
- Storage Humidity: 5% to 90% RH, Non-Condensing
Compliance
- Safety & Emissions: FCC, CE
Package Includes
- TP-Link TL-SM311LM / SM311LM SFP Module
- Installation Guide
Compatibility & Buying Information
Exact Product: This page is for the TP-Link TL-SM311LM Gigabit multimode SFP module. Current TP-Link documentation may shorten the product name to SM311LM while still identifying the module as part of the same TL-SM311LM family.
1000BASE-SX: TL-SM311LM is a Gigabit multimode fiber transceiver using an 850 nm optical signal. It is not a 10 Gigabit SFP+ module and should not be selected for 10G links.
Multimode Fiber Only: This model is intended for multimode fiber. Customers requiring long-distance single-mode connectivity should use a compatible single-mode transceiver such as the appropriate SM311LS-family module instead.
Duplex LC Connection: TL-SM311LM uses separate transmit and receive fiber strands through a duplex LC connector. It is not a single-fiber BiDi transceiver.
Transmission Distance: TP-Link lists up to 550 meters using compatible 50/125 ?m multimode fiber and approximately 275 meters when using 62.5/125 ?m multimode fiber. Actual link performance depends on fiber grade, connector loss, patch panels, splices, and overall optical loss.
SFP Port Required: The host device must provide a compatible Gigabit SFP interface. An SFP+ slot may accept 1G SFP modules on some switches, but that depends on the specific host device and port configuration.
TP-Link Compatibility: TP-Link identifies the module as compatible with supported SFP ports across its switch products and specifically lists compatibility with the MC220L media converter.
MC200CM Use: TP-Link also lists TL-SM311LM for use alongside the MC200CM when building compatible multimode-fiber connections.
DDM & Hardware Revision: Current SM311LM documentation lists Digital Diagnostic Monitoring, SFP-MSA compatibility, and hot-swappable operation. Older TL-SM311LM documentation does not always list these features, so hardware revision should be checked if DDM capability is specifically required.
Hot Swapping: Current hardware supports hot-pluggable installation, but follow the host switch or media converter instructions when inserting or removing optical modules and fiber cabling.
Matching Transceivers: Use compatible optical standards, wavelength, fiber type, connector type, and link speed at both ends of the fiber connection. A multimode 850 nm SX module should normally be paired with a compatible 1000BASE-SX endpoint.
Fiber Cable Not Included: The SFP module does not replace the fiber patch cable. A compatible duplex multimode LC fiber cable must be selected separately according to the installation distance and fiber infrastructure.
Best Fit: TL-SM311LM is best suited to short-range Gigabit fiber links requiring a compact multimode SFP transceiver, duplex LC connectivity, 850 nm optics, and distances up to approximately 550 meters.