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LINK-PP LS-SM551G-A2C 1.25G SFP 1550nm 120km Duplex LC DOM SMF Optical Transceiver Module
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LINK-PP LS-SM551G-A2C 1.25G SFP 1550nm 120km Duplex LC DOM SMF Optical Transceiver Module

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Product summary

Product
LINK-PP LS-SM551G-A2C 1.25G SFP 1550nm 120km Duplex LC DOM SMF Optical Transceiver Module
SKU
181772
P/N
LS-SM551G-A2C
Price
$ 25
Stock
1100 in Stock
Sold
900
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
5 Questions
900 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-A2C 1.25G SFP Specifications

The LINK-PP LS-SM551G-A2C is a high-performance Small Form-factor Pluggable transceiver designed for long-reach Gigabit Ethernet and Fibre Channel applications. Operating at a 1.25Gbps signaling rate, this single-mode module delivers optimal performance over extended optical links. It features a reliable 1550nm DFB transmitter and a highly sensitive PIN receiver, ensuring exceptional signal integrity and low power consumption across commercial operating environments.

LINK-PP Part Number LS-SM551G-A2C Vendor Name LINK-PP
Form Factor SFP Max Data Rate 1.25Gbps
Wavelength 1550nm Max Cable Distance 120km
Connector Duplex LC Media SMF
Transmitter Type
DFB Receiver Type
PIN
TX Power 0 to +5dBm RX Power -30 to -1dBm
Receiver Sensitivity -28dBm 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-A2C 1.25G SFP

This commercial-grade transceiver features hot-pluggable capability for seamless, zero-downtime installations and maintenance. Equipped with a high-performance 1550nm DFB laser and digital diagnostic monitoring, the module delivers an exceptional power budget, ultra-low electromagnetic interference, and stable long-distance connectivity across modern fiber networks.

LINK-PP LS-SM551G-A2C 1.25G SFP Optical Module

The LINK-PP LS-SM551G-A2C optical module provides a cost-effective and dependable hardware solution for enterprise networks. Built with high-quality optoelectronic components, this SFP transceiver satisfies the increasing demand for high-density, energy-efficient fiber optic communication infrastructure.

LS-SM551G-A2C: 1.25G Connectivity for OTN Trunk Lines

Engineered for high-capacity backbone networks, this SFP module provides robust 1.25G throughput for optical transport network trunk lines. It maintains stable data transmission, reduces packet loss, and optimizes bandwidth efficiency across long-haul telecommunication systems.

LS-SM551G-A2C Module with 1550nm Wavelength

Utilizing the low-attenuation 1550nm optical wavelength window, this SFP module maximizes signal efficiency over single-mode fiber. The 1550nm DFB laser minimizes dispersion, ensuring clean signal propagation through extensive fiber optic network pathways.

LS-SM551G-A2C Module Supporting 120km Transmission

Specially engineered for ultra-long-haul networking, this module supports an impressive transmission distance of up to 120 kilometers. It eliminates the need for expensive intermediate repeaters, significantly lowering overall network deployment and infrastructure costs.

LS-SM551G-A2C Module with Duplex LC Interface

Featuring a standard duplex LC connector, this transceiver ensures reliable physical alignment and low insertion loss. The compact LC interface supports high-density patch panel configurations, maximizing chassis space efficiency in data centers.

LS-SM551G-A2C Module with DOM for Real-Time Monitoring

Integrated Digital Optical Monitoring allows network administrators to track real-time operational parameters. This diagnostic feature tracks internal temperature, supply voltage, laser bias current, and optical power to ensure proactive network maintenance.


LINK-PP LS-SM551G-A2C 1.25G SFP Certification

This optical transceiver is fully certified under rigorous international standards, confirming its safety, environmental friendliness, and manufacturing excellence for global networking deployments.

Optical Transceivers Testing

Every single transceiver undergoes a comprehensive automated quality testing program, validating parametric performance, structural integrity, and long-term functional stability before leaving our facility.

LS-SM551G-A2C Quality Certifications

The module strictly complies with CE, FCC, RoHS, and ISO9001 quality management standards, ensuring environmentally responsible manufacturing and dependable operational safety.

LS-SM551G-A2C Certified for Reliable Host-Device Compatibility

Comprehensive EEPROM coding and rigorous hardware verification guarantee seamless compatibility with major industry switch, router, and media converter platforms.


Rigorous Testing Ensures Reliable SFP Performance

Our comprehensive multi-stage testing procedure validates every technical specification, ensuring that each SFP module delivers exceptional field reliability and optimal network uptime.

Optical

Optical Spectrum Test

Advanced spectral analysis verifies central wavelength accuracy and side-mode suppression ratio standards.

Optical

Eye Pattern Test

Oscilloscope eye diagram analysis confirms excellent signal-to-noise ratios and low transmitter jitter.

Optical

Bit Error Rate Test

Extensive bit error rate testing guarantees flawless data packet delivery and transmission integrity.

Optical

Temperature Test

Thermal chamber cycling validates reliable, stable performance across the full commercial temperature range.


Product Shipping for LINK-PP LS-SM551G-A2C 1.25G SFP

Our optimized global shipping process ensures that your optical components arrive safely, securely, and completely on schedule, ready for immediate network deployment.

Anti-Static Protective Packaging

Anti-Static Protective Packaging

Each module is sealed inside customized ESD packaging to prevent electrostatic damage.

Shock-Resistant Transport Protection

Shock-Resistant Transport Protection

Cushioned multi-slot trays safeguard the delicate optical interfaces against mechanical impact during transport.

Fast Order Processing and Dispatch

Fast Order Processing and Dispatch

Our efficient warehousing system ensures rapid order validation, secure packaging, and immediate dispatch.

Global Logistics and International Delivery

Global Logistics and International Delivery

Partnering with premium international couriers guarantees reliable, tracked doorstep delivery to global destinations.

LINK-PP LS-SM551G-A2C 1.25G SFP Usage Demonstration

This technical reference section provides clear step-by-step guidance on hardware installation, optical fiber connection, and software-based DDM parameter verification, ensuring smooth integration of the SFP transceiver into your active network switch architecture.

LS-SM551G-A2C 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-A2C 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-A2C 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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B***s
Viet Nam
Verified Purchase
5 .0
2026-05-09
Installed these 1550nm transceivers for campus fiber networking. Great value for bulk procurement!
L***a
Poland
Verified Purchase
5 .0
2026-05-02
Upgraded our cell tower backhaul with these 1.25g modules. Super stable link so far!
D***r
Costa Rica
Verified Purchase
5 .0
2026-02-27
Used this single-mode module for bridging two buildings. Easy 120km max distance capability!
R***n
Greece
Verified Purchase
5 .0
2026-02-24
Tested this cisco compatible 1g sfp in our core network. Zero packet loss observed.
C***z
Switzerland
Verified Purchase
5 .0
2026-02-20
As a DC tech, I need reliable dom support to monitor voltage and bias current. This MSA compliant transceiver integrated perfectly with our NMS, surviving heavy loads in our multi-brand switch topology.
J***r
Belgium
Verified Purchase
5 .0
2026-02-16
Bulk deployment went smooth. Highly recommended!
A***n
Ukraine
Verified Purchase
5 .0
2026-02-11
Awesome 1G SFP for legacy NAS setup.
J***n
Poland
Verified Purchase
5 .0
2026-01-28
DOM optical module parameters showed -25dBm RX, well within the -28dBm sensitivity limit.
C***g
Denmark
Verified Purchase
5 .0
2026-01-24
DOM support works perfectly on my Ubiquiti switch.
A***k
Denmark
Verified Purchase
5 .0
2026-01-12
We deployed 50 of these duplex lc smf transceivers in an outdoor cabinet scenario. Despite nearing the 70°C limit during summer, the PIN receiver maintained zero errors on our base station backhaul.
E***z
Czech Republic
Verified Purchase
5 .0
2025-12-12
Tested the IEEE 802.3ah-2004 protocol compatibility for our enterprise ring topology. The 1550nm DFB transmitter is incredibly stable, making this cisco compatible 1g sfp a massive cost saver for large campus fiber deployments.
R***s
Brazil
Verified Purchase
5 .0
2025-10-11
Solid smf optical transceiver for multi-brand switches!
B***g
Tunisia
Verified Purchase
5 .0
2025-09-05
Nice TX/RX power levels right out the box.
C***n
Netherlands
Verified Purchase
4 .0
2025-08-30
Great 1.25g sfp 1550nm 120km modules, but the bulk packaging was slightly dented upon arrival.
S***s
Dominican Republic
Verified Purchase
5 .0
2025-08-23
Smooth gigabit ethernet link for our home NAS. The duplex lc connector clicks perfectly.
E***n
Portugal
Verified Purchase
5 .0
2025-07-27
Reliable 1.25gbps connection over a 100km run. ⚡
S***l
Venezuela
Verified Purchase
5 .0
2025-06-19
Perfect duplex lc smf transceiver for indoor cabinets.
A***s
Norway
Verified Purchase
5 .0
2025-05-17
Exactly what our server room needed today.
T***h
Poland
Verified Purchase
5 .0
2025-04-20
The 0 to 70°C temp range is adequate for our indoor server rack deployments. ❄️
D***s
Netherlands
Verified Purchase
5 .0
2025-03-21
Ran an OTDR and light meter on this 1.25g sfp 1550nm 120km module. TX power sits beautifully at +2dBm, hitting our remote site 80km away with pristine signal integrity. Elite tier hardware!
K***n
Singapore
Verified Purchase
4 .0
2025-03-19
Works flawless in my campus fiber networking setup. Shipping took a day longer than expected.
T***a
Russian Federation
Verified Purchase
5 .0
2025-03-15
Connected flawless with our Juniper gear. Quality smf optical transceiver module for the price.
B***r
France
Verified Purchase
5 .0
2025-03-07
1550nm DFB laser runs cool and stable.
S***n
Brazil
Verified Purchase
5 .0
2025-01-14
SFF-8472 protocol checks out. Solid buy! ✅
A***g
Finland
Verified Purchase
5 .0
2024-12-06
Great MSA compliant modules, plug and play!
S***s
United States
Verified Purchase
5 .0
2024-06-05
You could do a better job of describing, displaying the items.
D***N
Austria
Verified Purchase
5 .0
2024-06-01
Based on this, my first purchase from Link-pp, I will definitely continue shopping through Link-pp. The products are top of the line, and the price is almost unbeatable by any other providers.
j***n
Indonesia
Verified Purchase
5 .0
2024-04-12
We have been these for more than three years without any problems.
A***e
Israel
Verified Purchase
5 .0
2024-04-04
The parts actually got here before promised and the price was outstanding.
H***i
Hungary
Verified Purchase
5 .0
2024-03-12
quick shipping process
A***e
India
Verified Purchase
5 .0
2024-03-10
This module was priced very competitively and worked exactly as intended.
M***s
United States
Verified Purchase
5 .0
2024-02-29
Link-ppstore is my first choice.
M***o
Thailand
Verified Purchase
5 .0
2024-02-11
no issue so far on the item.
T***a
Iran, Islamic Republic of
Verified Purchase
5 .0
2024-01-27
very pleased w/ all orders to date.
B***n
Brazil
Verified Purchase
5 .0
2024-01-07
First time ordering from this company. Great price! Arrived on time and exactly what I wanted.
C***h
Belarus
Verified Purchase
5 .0
2024-01-01
They work very well, no errors in the logs thus far.
V***l
Denmark
Verified Purchase
5 .0
2023-12-14
Easy navigation, easy prdering and easy shipping. I was happy and amused by the comical but informative order tracking emails.
R***e
Finland
Verified Purchase
5 .0
2023-11-12
I had a good experience with Link-PP. Hope to do more business in the future.
D***n
United States
Verified Purchase
5 .0
2023-11-08
Easy to check out and always very Fast shipping with great prices.
H***e
United States
Verified Purchase
5 .0
2023-09-25
The technical help I received pre purchase was excellent and pointed me to the correct item to buy. The item arrived on time and worked perfectly.
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