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LS-SM311G-20I 1.25g sfp 1310nm 20km duplex lc dom smf optical transceiver module (industrial)
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LINK-PP LS-SM311G-20I 1.25G SFP 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

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Product summary

Product
LINK-PP LS-SM311G-20I 1.25G SFP 1310nm 20km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU
181611
P/N
LS-SM311G-20I
Price
$ 5.7
Stock
810 in Stock
Sold
1.4K
For Order Over $1000 Get $15.00 Off , Code: Linkpp15
For Order Over $3000 Get $50.00 Off , Code: Linkpp50
For Order Over $5000 Get $100.00 Off , Code: Linkpp100
New Users: $10 Coupon for Orders , Code: linkpp2610
20 Reviews
4 Questions
1.4K Sold
Shipping:
Free Shipping
to United States via FedEx
Estimated delivery time : 3 - 10 days.
5-Year Warranty 30-Day Returns 30-Day Exchange
Warranty
  • Providing industry-leading 5-year warranty.
  • Read the table for details of all products' warranty.
Returns & Exchange
  • Refunds will be received about 5 business days after the receipt of returned items.
  • Items in stock for replacement can be shipped within 1 business day.
  • Read the full return policy for details.
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LINK-PP LS-SM311G-20I 1.25G SFP Specifications

The LINK-PP LS-SM311G-20I is a high-performance, industrial-grade 1.25G SFP optical transceiver designed for dependable gigabit networks. It operates at a 1310nm wavelength over single-mode fiber, achieving transmissions up to 20km via a duplex LC connector. Supporting DOM, this module delivers robust connectivity across extreme temperatures ranging from -40°C to 85°C.

LINK-PP Part Number LS-SM311G-20I Vendor Name LINK-PP
Form Factor SFP Max Data Rate 1.25Gbps
Wavelength 1310nm Max Cable Distance 20km
Connector Duplex LC Media SMF
Transmitter Type FP Receiver Type

PIN

TX Power -9 to 0dBm RX Power -23 to -1dBm
Receiver Sensitivity -23dBm DOM Support Yes
Operating Temperature Range -40 to 85°C Protocols

SFF-8472 MSA Compliant, IEEE 802.3ah-2004, IEEE 802.3z

Key Features of LINK-PP LS-SM311G-20I 1.25G SFP

This industrial-grade transceiver features 1.25Gbps throughput, a 1310nm FP laser, and a 20km reach over single-mode fiber. It provides an extended operating temperature range, dual LC connectors, digital optical monitoring support, hot-pluggable capability, and low power consumption for optimal network performance.

LINK-PP LS-SM311G-20I 1.25G SFP Optical Module

The LINK-PP LS-SM311G-20I is a hot-pluggable SFP optical module engineered for harsh industrial environments. It delivers stable 1.25Gbps data rates, ensuring efficient and uninterrupted optical communication across diverse networking platforms.

LS-SM311G-20I: 1.25Gbps Connectivity for Enterprise LAN Backbone

Boasting a fast 1.25Gbps data rate, the LS-SM311G-20I serves as an ideal backbone solution for enterprise local area networks. It effectively eliminates data bottlenecks, offering scalable bandwidth and high-speed data transmission.

LS-SM311G-20I Module with 1310nm Wavelength

Utilizing a precise 1310nm wavelength, this optical module optimizes signal integrity and minimizes attenuation. It is engineered to deliver reliable, high-performance laser transmission across single-mode fiber infrastructure for critical network links.

LS-SM311G-20I Module Supporting 20km Transmission

Designed for extended reach, this SFP transceiver supports long-distance data transmission up to 20km. It bridges remote network nodes without signal degradation, making it perfect for metropolitan and campus-wide deployments.

LS-SM311G-20I Module with Duplex LC Interface

Equipped with an industry-standard duplex LC interface, this module guarantees secure, stable optical connections. Its compact connector design maximizes port density on switches and routers while simplifying fiber cable installation.

LS-SM311G-20I Module with DOM for Real-Time Monitoring

Featuring advanced Digital Optical Monitoring, the module tracks operational parameters in real time. Network administrators can easily monitor temperature, voltage, and laser power to ensure proactive system maintenance and reliability.


LINK-PP LS-SM311G-20I 1.25G SFP Certification

The LINK-PP LS-SM311G-20I undergoes strict certification to meet rigorous global standards. It complies fully with MSA guidelines, guaranteeing seamless integration and high operational safety in diverse networks.

Optical Transceivers Testing

Every transceiver undergoes a comprehensive quality testing program before leaving the factory. This rigorous process evaluates hardware durability and performance consistency under maximum workload conditions.

LS-SM311G-20I Quality Certifications

This SFP module holds premier quality certifications, including RoHS, CE, and FCC compliance. These credentials confirm that the product adheres to international safety and environmental regulations.

LS-SM311G-20I Certified for Reliable Host-Device Compatibility

The module is comprehensively certified for broad host-device compatibility. It is guaranteed to work seamlessly with switches, routers, and servers from all major networking equipment brands.


Rigorous Testing Ensures Reliable SFP Performance

Each industrial module undergoes comprehensive testing to verify peak performance, excellent signal quality, and unwavering operational reliability under heavy network traffic.

Optical

Optical Spectrum Test

Advanced spectrum analysis measures precise central wavelength and spectral width to guarantee compliance.

Optical

Eye Pattern Test

Eye diagram testing evaluates transmitter signal quality, ensuring low jitter and clear optical waveforms.

Optical

Bit Error Rate Test

This test evaluates data integrity, verifying error-free packet transmission across long physical distances.

Optical

Temperature Test

Thermal stress testing verifies flawless operations under extreme conditions from -40°C to 85°C.


Product Shipping for LINK-PP LS-SM311G-20I 1.25G SFP

We utilize professional, multi-layered packaging and secure logistics networks to guarantee that your optical modules arrive safely and promptly worldwide.

Anti-Static Protective Packaging

Anti-Static Protective Packaging

Each transceiver is sealed inside an individual anti-static bag to prevent electrical damage.

Shock-Resistant Transport Protection

Shock-Resistant Transport Protection

Cushioned specialized boxes guard the delicate internal optics against mechanical shocks during transit.

Fast Order Processing and Dispatch

Fast Order Processing and Dispatch

Our streamlined warehouse system ensures quick processing and rapid dispatch of your orders.

Global Logistics and International Delivery

Global Logistics and International Delivery

We partner with top international carriers to provide fast, tracked global delivery services.

LINK-PP LS-SM311G-20I 1.25G SFP Usage Demonstration

To deploy the module, insert it into a compatible SFP slot until it clicks securely. Connect the duplex LC single-mode fiber cables to bridge your network hardware, allowing immediate, automatic high-speed data transmission.

LS-SM311G-20I Technical Support

LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.

Pre-Sales Technical Consultation

Pre-Sales Technical Consultation

Professional technical guidance to help customers select the most suitable LS-SM311G-20I modules based on network architecture and application requirements.

Compatibility Verification Support

Compatibility Verification Support

Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.

Deployment & Installation Assistance

Deployment & Installation Assistance

Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.

Long-Term Technical Assurance

Long-Term Technical Assurance

Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.

LINK-PP LS-SM311G-20I 1.25G SFP After-Sales Assurance

LINK-PP provides after-sales support for the smooth deployment and reliable operation of the optical modules.

15 days

15-day no-reason return and refund

Free maintenance or replacement

Free replacement for dead-on-arrival (DOA) or defective items within the initial period

Free maintenance

 Free repair services for manufacturing defects throughout the warranty period

Limitations

Warranty exclusions and conditions apply

Model Comparison Table

LINK-PP

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M***e
Egypt
Verified Purchase
5 .0
2026-05-21
Solid 1.25G transceiver for single-mode fiber links.
P***s
Viet Nam
Verified Purchase
5 .0
2026-05-12
Deploying these industrial 1.25G SFP modules across outdoor base stations was a breeze. They easily handle extreme temps. DOM reporting is precise, making remote fiber maintenance much simpler for us.
R***e
Poland
Verified Purchase
5 .0
2026-04-20
Flawless 1310nm SFP for our campus network!
B***n
Ireland
Verified Purchase
5 .0
2026-02-14
No issues with IEEE 802.3z protocol adaptation.
S***n
Taiwan, Province of China
Verified Purchase
5 .0
2026-02-12
Perfect for our base station backhaul deployment.
P***h
Argentina
Verified Purchase
5 .0
2025-11-20
Bought a batch for server room deployment. The Duplex LC interfaces are well built.
R***s
Austria
Verified Purchase
5 .0
2025-10-17
Fast delivery, cheap 20km SFP modules.
A***e
Republic of Korea
Verified Purchase
5 .0
2025-09-21
Bulk ordered these for an enterprise LAN backbone upgrade. The Duplex LC connectors mate securely, and SFF-8472 compliance ensures seamless integration. Fantastic gigabit SFP performance at a fraction of brand costs.
W***l
France
Verified Purchase
5 .0
2025-08-16
Using these for our campus fiber network. The 20km transmission on single-mode fiber is perfectly stable. Real-time DOM monitoring is a lifesaver for our server room operations.
R***z
Ecuador
Verified Purchase
5 .0
2025-07-14
Plug and play Duplex LC, zero configuration needed!
E***g
Germany
Verified Purchase
5 .0
2025-05-09
DOM feature works great on Cisco switches.
L***r
Ireland
Verified Purchase
5 .0
2025-05-05
The DDM/DOM monitoring is super accurate. Great OEM compatibility with our diverse network hardware.
E***r
Canada
Verified Purchase
5 .0
2025-04-13
Tested this LINK-PP LS-SM311G-20I transceiver in our core multi-brand switches. OEM compatibility is spot on! The 1310nm laser pushes a solid 20km distance over SMF. Highly recommended for IT ops.
M***z
New Zealand
Verified Purchase
5 .0
2025-04-10
Great industrial SFP for outdoor enclosures!
P***z
Portugal
Verified Purchase
5 .0
2025-04-09
OEM compatible and running cool at -40°C.
B***e
Brazil
Verified Purchase
5 .0
2025-04-05
Needed industrial grade SFP for extreme heat. 85°C rating holds up perfectly outside. ☀️
M***n
Ecuador
Verified Purchase
5 .0
2025-03-29
Upgraded our park fiber network with these 1310nm SMF modules. Very reliable gigabit link!
L***l
Brazil
Verified Purchase
4 .0
2025-03-13
Box arrived slightly dented, but the LS-SM311G-20I modules work perfectly in our outdoor cabinets.
E***n
Poland
Verified Purchase
5 .0
2025-01-29
Excellent gigabit connectivity for outdoor switch cabinets. Survives winter freezes without dropping any packets. ❄️
M***l
Portugal
Verified Purchase
5 .0
2024-12-23
Used these 1.25G SFP transceivers for long-haul 20km links. Totally SFF-8472 compliant.
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