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LINK-PP LS-SM551G-40C 1.25G SFP 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
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LINK-PP LS-SM551G-40C 1.25G SFP 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module

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Product summary

Product
LINK-PP LS-SM551G-40C 1.25G SFP 1550nm 40km Duplex LC DOM SMF Optical Transceiver Module
SKU
181760
P/N
LS-SM551G-40C
Price
$ 11.5
Stock
3800 in Stock
Sold
2.2K
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
47 Reviews
4 Questions
2.2K 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-SM551G-40C 1.25G SFP Specifications

The LINK-PP LS-SM551G-40C is a high-performance SFP transceiver designed for 1.25Gbps data rates over single-mode fiber. Operating on a single +3.3V power supply, it features a 1550nm DFB laser transmitter and a PIN photodetector. It accommodates standard case temperatures from 0 to +70°C, ensuring reliable operation across various gigabit Ethernet networking applications and optical links.

LINK-PP Part Number LS-SM551G-40C Vendor Name LINK-PP
Form Factor SFP Max Data Rate 1.25Gbps
Wavelength 1550nm 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
0 to 70°C Protocols
SFF-8472 MSA Compliant, IEEE 802.3ah-2004

Key Features of LINK-PP LS-SM551G-40C 1.25G SFP

This hot-pluggable optical module supports up to 1.25Gbps bit rates and features real-time digital diagnostic monitoring. Utilizing a cost-effective SFP Multi-Source Agreement footprint with a duplex LC receptacle, it provides stable single-mode transmission up to 40km for demanding gigabit optical systems and links.

LINK-PP LS-SM551G-40C 1.25G SFP Optical Module

The LINK-PP LS-SM551G-40C is a high-performance, cost-effective SFP optical module. It seamlessly integrates a DFB laser transmitter, a PIN photodiode with a TIA, and an MCU control unit for optimized gigabit networking.

LS-SM551G-40C: 1.25G Connectivity for Internet Service Provider (ISP)

Delivering dependable 1.25Gbps connectivity, this SFP transceiver is perfect for Internet Service Providers building long-distance Gigabit Ethernet networks. It ensures continuous data flow across metropolitan links with Class I laser safety compliance.

LS-SM551G-40C Module with 1550nm Wavelength

Equipped with a 1550nm DFB laser transmitter, this module operates efficiently within a centre wavelength range of 1530nm to 1570nm. This specific wavelength minimizes signal attenuation over expansive single-mode fiber telecommunication architectures.

LS-SM551G-40C Module Supporting 40km Transmission

Engineered for extended reach, this single-mode transceiver supports up to 40km transmission distance. It maintains an average output power between -5 and 0 dBm to successfully bridge remote network infrastructure locations.

LS-SM551G-40C Module with Duplex LC Interface

Featuring a standard duplex LC receptacle, this transceiver guarantees secure and seamless fiber patch cable connectivity. It is fully compliant with the SFP MSA footprint for effortless, hot-pluggable deployment in compatible host systems.

LS-SM551G-40C Module with DOM for Real-Time Monitoring

The integrated digital diagnostics functions allow real-time monitoring of critical parameters via a 2-wire serial interface. Network administrators can track internal temperature, supply voltage, laser bias, and optical power levels effortlessly.


LINK-PP LS-SM551G-40C 1.25G SFP Certification

This premium optical transceiver is fully compatible with RoHS directives. It satisfies rigorous environmental and industry baselines to deliver safe, eco-friendly operation within standard telecom infrastructure.

Optical Transceivers Testing

Our comprehensive product quality testing program verifies data integrity and multi-rate performance across all units, ensuring absolute stability and high efficiency for long-distance gigabit optical systems.

LS-SM551G-40C Quality Certifications

Built in compliance with SFP MSA and SFF-8472 specifications, the module carries essential industry hallmarks including RoHS compatibility. These certifications guarantee top-tier build quality and global safety standards.

LS-SM551G-40C Certified for Reliable Host-Device Compatibility

Adhering strictly to standard SFP footprints, this hot-pluggable module is certified for seamless plug-and-play compatibility across an extensive range of standard switches, routers, and host devices.


Rigorous Testing Ensures Reliable SFP Performance

Our rigorous screening process subjects each module to extensive performance benchmarks, ensuring reliable hardware execution and flawless data transmission across gigabit networks.

Optical

Optical Spectrum Test

This verifies that the 1550nm centre wavelength complies with strict spectral width limits.

Optical

Eye Pattern Test

Evaluates transmitter signal quality to guarantee clean optical wave outputs and high extinction ratios.

Optical

Bit Error Rate Test

Measures signal reception using PRBS test patterns to confirm a bit error rate below 1×10⁻¹².

Optical

Temperature Test

Validates reliable device functionality across the standard case temperature range of 0 to +70°C.


Product Shipping for LINK-PP LS-SM551G-40C 1.25G SFP

Our professional shipping process protects your SFP modules throughout transit, ensuring safe, secure, and prompt delivery to our valued global destinations.

Anti-Static Protective Packaging

Anti-Static Protective Packaging

Modules are sealed in premium anti-static ESD bags for maximum safety.

Shock-Resistant Transport Protection

Shock-Resistant Transport Protection

Thick customized foam cushioning guards against physical impacts during transit.

Fast Order Processing and Dispatch

Fast Order Processing and Dispatch

Orders are rapidly processed and dispatched within minimal handling turnarounds.

Global Logistics and International Delivery

Global Logistics and International Delivery

Reliable international carriers provide secure express courier delivery directly to your door.

LINK-PP LS-SM551G-40C 1.25G SFP Usage Demonstration

Simply insert this hot-pluggable module into any SFP port on your switch or router. Connect a duplex LC single-mode fiber patch cable to achieve immediate, low-latency 1.25Gbps gigabit connectivity across your network infrastructure.

LS-SM551G-40C 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-SM551G-40C 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-SM551G-40C 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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A***s
Brazil
Verified Purchase
5 .0
2026-05-29
Solid 1550nm module, totally MSA compliant. ✅
R***s
Netherlands
Verified Purchase
5 .0
2026-05-28
Reliable 40km reach! Excellent build quality for commercial 0-70°C environments. Will definitely buy again.
J***n
Ireland
Verified Purchase
5 .0
2026-05-26
Using this duplex LC optical transceiver to bridge our main office and warehouse. Link came up instantly. DOM integration works perfectly via SNMP, making remote monitoring a breeze for our network admins.
A***z
Sweden
Verified Purchase
5 .0
2026-05-06
Needed long-reach modules for a 35km cell tower backhaul. The DFB laser handles the distance effortlessly over standard SMF without packet loss. Excellent MSA compliant gear for our datacenter bulk deployment.
J***n
Switzerland
Verified Purchase
5 .0
2026-04-23
Tested the LS-SM551G-40C across Dell and Arista hardware. Zero compatibility issues. Standard 0-70°C temp rating is perfect for our indoor racks. Great alternative to overpriced OEM optics for gigabit Ethernet architectures.
A***s
Germany
Verified Purchase
5 .0
2026-03-12
Perfect 40km SMF reach, no errors.
J***k
Hong Kong
Verified Purchase
5 .0
2025-12-22
Accurate DOM readings. Great value!
E***h
Brazil
Verified Purchase
5 .0
2025-10-31
Flawless Cisco compatibility! Just plug and play.
B***n
Viet Nam
Verified Purchase
5 .0
2025-10-05
Massive savings on bulk orders. Flawless 1.25G SFP 1550nm modules for our ISP nodes.
E***l
Macao
Verified Purchase
5 .0
2025-09-12
Duplex LC fits snug and secure.
S***r
Republic of Korea
Verified Purchase
5 .0
2025-08-11
Recognized immediately by our Juniper gear.
M***z
France
Verified Purchase
5 .0
2025-06-12
Solid DFB/PIN performance. Pulled 1.25Gbps throughput on our enterprise fiber upgrade without breaking a sweat.
L***l
Denmark
Verified Purchase
5 .0
2025-06-12
Great for standard 0-70°C indoor racks.
J***n
Indonesia
Verified Purchase
5 .0
2025-05-27
Affordable 1.25G SFP for bulk datacenter use.
J***l
Portugal
Verified Purchase
4 .0
2025-05-09
Solid 1550nm transceivers. Delivery delayed by two days at customs, but packaging was fine.
B***s
Brazil
Verified Purchase
5 .0
2025-05-01
Perfect Cisco compatible SFP. Bridged our site over 20km with absolutely zero packet loss.
R***s
Spain
Verified Purchase
5 .0
2025-04-23
Smooth single-mode fiber connection. The duplex LC interface clicked in perfectly and stayed secure.
S***z
Austria
Verified Purchase
5 .0
2025-04-08
No issues syncing with our Fortinet firewall. Awesome cost-effective fiber module for B2B procurement.
J***n
Dominican Republic
Verified Purchase
5 .0
2025-02-07
Great MSA compliant transceivers! Replaced our old failed modules in the server room perfectly.
E***s
Argentina
Verified Purchase
5 .0
2025-01-26
Zero packet loss on our gigabit link.
S***n
Colombia
Verified Purchase
5 .0
2025-01-22
Works perfectly for our campus fiber network.
M***n
Viet Nam
Verified Purchase
5 .0
2025-01-14
Stable DFB laser output, highly recommended!
J***l
Malaysia
Verified Purchase
5 .0
2025-01-06
Deployed these 1.25G 1550nm SFPs for a campus fiber ring. DOM readings are highly accurate. TX power sits nicely around -2dBm. 100% plug-and-play with our mixed Cisco and Juniper switches!
P***s
Belgium
Verified Purchase
4 .0
2024-12-30
Modules work flawlessly for our 40km link, but the shipping box was pretty crushed.
A***s
Greece
Verified Purchase
5 .0
2024-12-26
Works instantly on Netgear switches. DOM features are super helpful for troubleshooting link degradation.
F***n
Sweden
Verified Purchase
5 .0
2024-07-15
l-p.com consistently has competitive prices on top of the line fiber optical components with great customer service and Fast shipping. It's a very trustworthy company to do business with.
L***M
United States
Verified Purchase
5 .0
2024-06-24
There are two main reasons why I purchase Sfp Cage in l-p.com, response is very Fast, also the price is inexpensive.
M***i
Ireland
Verified Purchase
5 .0
2024-06-11
l-p.com is the best place. I consistently find what I am looking for at the best price. Shipping is nearly instant. Never dissatisfied. Good customer service; easy shopping experience.
B***t
Singapore
Verified Purchase
5 .0
2024-04-23
They have worked with me so in depth on projects and helped develop my knowledge.
S***n
Ukraine
Verified Purchase
5 .0
2024-03-19
The company works with us very easily and I would recommend them to others
E***g
United States
Verified Purchase
5 .0
2024-03-08
Very good price and low shipping cost compared to all other vendors for the product ordered.
H***e
Philippines
Verified Purchase
5 .0
2024-01-12
I purchased two items at an amazingly low price compared to other sites
E***L
Singapore
Verified Purchase
5 .0
2023-12-02
No bad, no issues to report.
M***n
Canada
Verified Purchase
5 .0
2023-11-29
This product is excellent. I use it to connect my switch. Great feedback from the company when I asked a question about compatibility.
W***e
Spain
Verified Purchase
5 .0
2023-10-08
Customer service representative Jessica provided me excellent service.
R***n
United States
Verified Purchase
5 .0
2023-08-22
Is great i have the product and works perfectly i am satisfied with the product the deliver was very well
M***a
Mexico
Verified Purchase
5 .0
2023-06-21
Needs another way to send the goods because Fedex is Fast but very expensive.
G***p
Maldives
Verified Purchase
5 .0
2023-06-20
Good prices and selection.
e***y
Republic of Korea
Verified Purchase
5 .0
2023-06-11
quick shipping process
D***o
United States
Verified Purchase
5 .0
2023-05-09
quick delivery is appreciated for our urgent demands.
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