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LS-SM311G-40I 1.25g sfp 1310nm 40km duplex lc dom smf optical transceiver module (industrial)
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LINK-PP LS-SM311G-40I 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)

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Product summary

Product
LINK-PP LS-SM311G-40I 1.25G SFP 1310nm 40km Duplex LC DOM SMF Optical Transceiver Module (Industrial)
SKU
181616
P/N
LS-SM311G-40I
Price
$ 12
Stock
755 in Stock
Sold
645
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
51 Reviews
3 Questions
645 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-40I 1.25G SFP Specifications

The LINK-PP LS-SM311G-40I is an industrial-grade 1.25G SFP transceiver engineered for optimal performance. Operating at a 1310nm wavelength over single-mode fiber, it supports transmission distances up to 40km. Featuring a duplex LC interface and full Digital Optical Monitoring, this hot-pluggable module operates reliably across a wide temperature range from -40°C to 85°C.

LINK-PP Part Number LS-SM311G-40I Vendor Name LINK-PP
Form Factor SFP Max Data Rate 1.25Gbps
Wavelength 1310nm Max Cable Distance 40km
Connector Duplex LC Media SMF
Transmitter Type
DFB Receiver Type
PIN
TX Power -5 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

Key Features of LINK-PP LS-SM311G-40I 1.25G SFP

This robust industrial transceiver offers exceptional reliability with its hot-swappable SFP footprint, highly stable 1310nm DFB laser, and standard duplex LC connector. Designed for harsh environments, it features integrated DOM for precise diagnostics, guaranteeing low insertion loss and superior power efficiency across extensive long-haul Gigabit network deployments.

LINK-PP LS-SM311G-40I 1.25G SFP Optical Module

The LINK-PP LS-SM311G-40I optical module provides high-speed, cost-effective data transmission for demanding telecommunication setups. It seamlessly upgrades existing infrastructure, ensuring low-latency data flow and excellent electromagnetic interference resistance for stable backbone connections.

LS-SM311G-40I: 1.25G Connectivity for Industrial Automation Network

Engineered for industrial automation, this SFP module thrives in extreme environments from -40°C to 85°C. It delivers rock-solid 1.25G connectivity for factory floors, traffic control systems, and outdoor telecom nodes requiring absolute uptime.

LS-SM311G-40I Module with 1310nm Wavelength

Utilizing the optimal 1310nm wavelength, this optical transceiver guarantees low dispersion and attenuation on single-mode fibers. This precise optical configuration ensures high signal integrity, making it ideal for robust enterprise and intermediate-range telecom applications.

LS-SM311G-40I Module Supporting 40km Transmission

Designed for long-haul networking, this module supports high-performance data transmission up to 40 kilometers. It eliminates the need for frequent signal repeaters, dramatically lowering infrastructure costs while extending your network reach securely and efficiently.

LS-SM311G-40I Module with Duplex LC Interface

Featuring an industry-standard duplex LC connector, this SFP transceiver offers an ultra-secure, tightly locking mechanical connection. It ensures quick installation, minimal optical insertion loss, and seamless integration with standard high-density fiber patch cables.

LS-SM311G-40I Module with DOM for Real-Time Monitoring

Equipped with Digital Optical Monitoring (DOM), this module provides real-time tracking of critical operational parameters. Technicians can easily monitor temperature, voltage, and laser power, allowing for proactive troubleshooting and sustained network health.


LINK-PP LS-SM311G-40I 1.25G SFP Certification

This premium LINK-PP optical transceiver complies with rigorous global certification standards, ensuring it fully meets strict international benchmarks for safety, electromagnetic compatibility, environmental sustainability, and industrial-grade deployment.

Optical Transceivers Testing

Every single module undergoes an exhaustive quality testing program prior to leaving the facility, verifying performance standards, signal parameters, and complete functional stability under real-world applications.

LS-SM311G-40I Quality Certifications

Fully approved with essential quality certifications including CE, FCC, and RoHS, this transceiver adheres to top-tier manufacturing mandates, confirming eco-friendly materials and reliable industrial-grade processing.

LS-SM311G-40I Certified for Reliable Host-Device Compatibility

Extensively tested across major enterprise networking hardware brands, this certified SFP module guarantees seamless plug-and-play host compatibility, completely eliminating system configuration errors and ensuring absolute hardware interoperability.


Rigorous Testing Ensures Reliable SFP Performance

Our multi-stage internal verification process ensures every SFP module operates flawlessly, offering resilient performance, data consistency, and reliable network connectivity.

Optical

Optical Spectrum Test

Measures laser wavelength precision to ensure stable signal dispersion over long distances.

Optical

Eye Pattern Test

Analyzes overall transmitter signal quality, verifying optimal optical amplitude and minimal jitter.

Optical

Bit Error Rate Test

Evaluates maximum data packet integrity, guaranteeing zero packet loss during peak transmission.

Optical

Temperature Test

Validates absolute structural and operational reliability within extreme industrial thermal limits.


Product Shipping for LINK-PP LS-SM311G-40I 1.25G SFP

We employ professional shipping methodologies to guarantee your precision optical transceivers arrive safely, intact, and ready for immediate network integration.

Anti-Static Protective Packaging

Anti-Static Protective Packaging

Sealed in specialized ESD bags protecting sensitive electronics from electrostatic discharge.

Shock-Resistant Transport Protection

Shock-Resistant Transport Protection

Cushioned with premium shock-absorbing foam to prevent physical transit damage.

Fast Order Processing and Dispatch

Fast Order Processing and Dispatch

Streamlined warehouse operations ensure rapid packaging and swift shipment turnarounds.

Global Logistics and International Delivery

Global Logistics and International Delivery

Shipped via trusted global couriers for secure, tracked international delivery.

LINK-PP LS-SM311G-40I 1.25G SFP Usage Demonstration

This demonstration illustrates the effortless hot-swappable installation of the LS-SM311G-40I. Watch how seamlessly it clicks into an industrial switch, initializes instantly via the duplex LC interface, and begins long-range data transmission immediately without rebooting the system.

LS-SM311G-40I 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-40I 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-40I 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
Denmark
Verified Purchase
5 .0
2026-05-29
Using this 40km optical transceiver for a remote telecom base station backhaul. Plugged it into a Ciena router and the link came up instantly. Superb receiver sensitivity ensures stable long-haul Gigabit connectivity.
M***z
Chile
Verified Purchase
5 .0
2026-05-21
Perfect for our Cisco campus fiber network!
M***z
Costa Rica
Verified Purchase
5 .0
2026-03-31
Reliable 1.25G SFP 1310nm module. Good for long haul single-mode fiber links up to 40km.
D***n
United States
Verified Purchase
5 .0
2026-03-15
Awesome OEM compatibility and fast batch deployment.
M***t
Sweden
Verified Purchase
4 .0
2026-01-25
Box was slightly crushed on arrival, but the 1.25G industrial SFP works perfectly.
J***z
United States
Verified Purchase
5 .0
2026-01-02
Used these for a 38km base station backhaul. The DFB laser holds up great.
J***s
France
Verified Purchase
5 .0
2025-11-10
No issues syncing with FS and Mellanox.
D***k
Netherlands
Verified Purchase
5 .0
2025-09-20
Cheap and reliable 1.25G fiber optic transceiver.
S***r
Malaysia
Verified Purchase
5 .0
2025-07-22
Tested these -40 to 85°C transceivers in our factory floor switches. No packet loss!
S***r
India
Verified Purchase
5 .0
2025-07-15
Bought a batch for traffic control outdoor cabinets. Extreme temps don't bother these modules.
B***z
Denmark
Verified Purchase
5 .0
2025-07-13
Survived -30C in our remote base station!
D***z
Malaysia
Verified Purchase
5 .0
2025-07-12
Needed a reliable MSA compliant transceiver for an outdoor IP camera mesh. This industrial wide-temp SFP handles freezing nights perfectly. It synced with our mixed Alcatel environment without vendor lock-in complaints. Brilliant hardware. ❄️
A***n
Macao
Verified Purchase
5 .0
2025-07-09
Works perfectly in my home lab router.
J***s
Poland
Verified Purchase
5 .0
2025-07-03
Solid 40km transmission distance, zero drops.
R***n
Viet Nam
Verified Purchase
5 .0
2025-07-01
DOM support works flawlessly on Juniper switches.
C***a
Panama
Verified Purchase
5 .0
2025-06-27
Plug and play duplex LC SMF module.
C***l
Egypt
Verified Purchase
5 .0
2025-06-05
SFF-8472 MSA compliant indeed. The DDM readings are incredibly accurate on our Arista gear.
T***g
Argentina
Verified Purchase
5 .0
2025-06-03
We run industrial automation networks where summer enclosure temps hit 70°C. These rugged 1.25Gbps single-mode transceivers haven't flinched. The duplex LC connectors lock tight, and the 1310nm signal stays crystal clear over 20 miles.
S***z
Denmark
Verified Purchase
5 .0
2025-05-03
Upgraded our enterprise NAS network. Smooth 1G SFP integration with Netgear and H3C switches.
M***n
Brazil
Verified Purchase
5 .0
2025-03-22
Much cheaper than original Cisco 1G SFPs but performs exactly the same in production.
A***g
Kenya
Verified Purchase
5 .0
2025-02-26
Deployed 50 of these LS-SM311G-40I modules across a massive campus fiber ring. OEM compatibility with Brocade and Extreme switches is 100% spot on. Real-time DOM monitoring is a lifesaver for our ops!
R***l
Thailand
Verified Purchase
5 .0
2025-02-20
Excellent value for IEEE 802.3ah-2004 deployments. Works right out of the box with Dell.
R***n
Bolivia
Verified Purchase
5 .0
2025-02-14
Stable 1310nm wavelength connection over 35km link.
M***z
Japan
Verified Purchase
5 .0
2024-12-02
Great industrial grade SFP for outdoor enclosures.
C***n
Canada
Verified Purchase
5 .0
2024-06-05
They announced all the Optical Transceiver Modules are tested before shippment. From my experience. that's truth. My ordered items are all good.
M***n
Belgium
Verified Purchase
5 .0
2024-05-05
Everything worked to my complete satisfaction
Y***e
Hong Kong
Verified Purchase
5 .0
2024-04-20
Received what I ordered in a timely manner. Products arrived well packed and in perfect condition.
R***t
Hungary
Verified Purchase
5 .0
2024-04-12
Linkpp have always delivered quality products
T***y
Russian Federation
Verified Purchase
5 .0
2024-03-20
It is exactly what I needed for my project.
J***n
India
Verified Purchase
5 .0
2024-03-13
Great price, outstanding service.
B***g
Libyan Arab Jamahiriya
Verified Purchase
5 .0
2024-01-06
i love the clock that shows you how long you have to order to get tommorow.
M***a
United Kingdom
Verified Purchase
5 .0
2023-12-11
l-p.com is the best optical transceiver store, which i know. I received perform well.
T***i
Japan
Verified Purchase
5 .0
2023-11-29
Great price and always has what I'm looking for.
B***r
Indonesia
Verified Purchase
5 .0
2023-11-05
Good experience--products were shipped right away--exactly what we needed.
U***n
Malaysia
Verified Purchase
5 .0
2023-11-01
Thanks for your wonderful service!Will come back again soon.
D***r
Spain
Verified Purchase
5 .0
2023-10-04
No fuss, no drama - the product arrived on time, and worked perfectly.
A***y
Australia
Verified Purchase
5 .0
2023-10-03
Placed a few orders over the years with Link-PP. Their customers service have been brilliant and very helpful in the past and I always found the prices very competitive.
D***g
Indonesia
Verified Purchase
5 .0
2023-09-15
Great price for product and shipping. Fast shipping. Will shop again!
S***n
United Kingdom
Verified Purchase
5 .0
2023-09-04
link-pp is the best ! :)
M***s
Sweden
Verified Purchase
5 .0
2023-08-31
Quick delivery and great item. works perfect.
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