The LINK-PP LS-SM551G-A0I is a high-performance Small Form-factor Pluggable transceiver optimized for 1.25 Gbps Gigabit Ethernet deployments. This industrial-grade module incorporates a 1550nm DFB laser transmitter alongside a sensitive PIN photodiode receiver. It supports reliable data transmission over single-mode fiber infrastructure through a standard dual LC optical interface, maintaining seamless operational stability.
LINK-PP Part Number
LS-SM551G-A0I
Vendor Name
LINK-PP
Form Factor
SFP
Max Data Rate
1.25Gbps
Wavelength
1550nm
Max Cable Distance
100km
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
-40 to 85°C
Protocols
SFF-8472 MSA Compliant, IEEE 802.3ah-2004
Key Features of LINK-PP LS-SM551G-A0I 1.25G SFP
Engineered for demanding environments, this transceiver features an impressive 100km link length and a robust industrial temperature range from -40°C to 85°C. The integration of Digital Optical Monitoring provides critical real-time diagnostics, while the hot-pluggable design ensures simple, disruption-free installation into active network switches.
LINK-PP LS-SM551G-A0I 1.25G SFP Optical Module
The LINK-PP LS-SM551G-A0I optical module represents a reliable option for extending fiber infrastructure. Operating at a 1.25G data rate, it provides network engineers with an efficient method for long-haul bridging and aggregation.
LS-SM551G-A0I: 1.25G Connectivity for Secure Network Trunks.
Delivering steady 1.25G connectivity, this SFP transceiver supports secure backbone trunk lines across extensive corporate networks. Its consistent throughput prevents data bottlenecks, ensuring dependable communication links for critical enterprise applications and infrastructure.
LS-SM551G-A0I Module with 1550nm Wavelength
Utilizing the 1550nm optical wavelength, this module is specifically calibrated for low-attenuation performance. This specific wavelength enables optical signals to navigate long distances with minimal degradation, preserving total signal integrity throughout transmission.
Capable of supporting transmission distances up to 100km, this transceiver seamlessly bridges distant regional hubs. It allows networks to expand across cities without additional mid-span regeneration equipment, significantly reducing overall deployment complexity.
LS-SM551G-A0I Module with Duplex LC Interface
Featuring a standard duplex LC interface, the module provides a secure and highly reliable optical fiber connection. The precision alignment system ensures minimal insertion loss and optimal coupling with single-mode patch cables.
LS-SM551G-A0I Module with DOM for Real-Time Monitoring
Equipped with Digital Optical Monitoring capabilities, this module delivers continuous real-time insights into system health. Network administrators can seamlessly monitor temperature, laser bias current, and transceiver voltage to prevent unexpected network downtime.
LINK-PP LS-SM551G-A0I 1.25G SFP Certification
The LINK-PP LS-SM551G-A0I adheres strictly to rigorous global industry standards, guaranteeing that each manufactured unit meets international benchmarks for operations, functional safety, and complete electronic compatibility.
Every SFP module undergoes a comprehensive multi-stage testing regimen before distribution. This program verifies mechanical parameters and structural performance to maintain superior reliability under industrial-grade deployment conditions.
LS-SM551G-A0I Quality Certifications
Fully compliant with the SFP MSA agreement and SFF-8472 specifications, this transceiver holds essential regulatory certifications. It meets Class 1 FDA laser safety standards and CE directives.
This product is in conformity with ISO9001. This system is valid to a company engaging in development, production and supply service of fiber optical products. Please contact us to learn more.
ISO/IEC 27001 is an international standard for managing and processing information security. This standard is jointly developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It sets out requirements for establishing, implementing, maintaining, and continually improving an information security management system (ISMS). Ensuring the confidentiality, integrity, and availability of organizational information assets, obtaining an ISO 27001 certificate means that the enterprise has passed the audit conducted by a certification body, proving that its information security management system has met the requirements of the international standard. Please contact us to learn more.
This product is in conformity with ISO14001.It is intended for use by an organization seeking to manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability. Please contact us to learn more.
ISO 45001 is a global standard that sets out the requirements for an occupational health and safety management system (OH&SMS).
REACH is a European Union regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals. It came into force on 1st June 2007 and replaced a number of European Directives and Regulations with a single system. The regulation aims to protect human health and environmental safety, maintain and improve the competitiveness of the EU chemical industry, and develop innovative capabilities for non-toxic and harmless compounds to prevent market fragmentation, increase the transparency of the use of chemicals, promote non-animal experiments, and pursue sustainable social development.Please contact us to learn more.
This product meets the applicable requirements of Directive (EU) 2015/863 of RoHS. It restricts the use of 10 hazardous materials in the manufacture of various types of electronic and electrical equipment: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and four different phthalates. Please contact us to learn more.
This product fully accords with the FCC, which aims to manage the radio wave and magnetic fields more reasonably. Please contact us to learn more.
CB is an international system operated by IECEE. This product is based on IEC standards for testing the safety performance of electrical products. Please contact us to learn more.
This product fully accords with UKCA (UK Conformity Assessed) certificate, which signifies that it meets all relevant quality standards as well as health and safety requirements. Please contact us to learn more.
UL certification is a non-mandatory certification in the United States,mainly testing and certification of product safety performance.Its ultimate purpose is to obtain products with a fairly safe level for the market,and to contribute to ensuring human health and property safety.Please contact us to learn more.
LS-SM551G-A0I Certified for Reliable Host-Device Compatibility
Certified across an extensive cross-platform matrix, this module ensures seamless host-device interoperability. It avoids communication errors when integrated into diverse industrial switches, media converters, and enterprise routers.
Rigorous Testing Ensures Reliable SFP Performance
A strict testing sequence ensures maximum network up-time. Advanced analysis eliminates hardware faults, verifying that each SFP delivers dependable, uninterrupted long-haul performance.
Optical Spectrum Test
This analysis validates central wavelength accuracy and side-mode suppression ratios under continuous operation.
Eye Pattern Test
Optical transmitters are verified using eye diagrams to guarantee clean signals and zero distortion.
Bit Error Rate Test
Rigorous data flow testing evaluates packet transmission to confirm complete error-free link performance.
Temperature Test
Thermal chamber testing confirms flawless module functionality across the entire -40°C to 85°C industrial envelope.
Product Shipping for LINK-PP LS-SM551G-A0I 1.25G SFP
The technical presentation demonstrates proper module insertion into active core switches. It highlights correct duplex LC fiber cable connection practices and displays immediate DOM interface telemetry initialization across standard hardware configurations.
LS-SM551G-A0I 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
Professional technical guidance to help customers select the most suitable LS-SM551G-A0I modules based on network architecture and application requirements.
Compatibility Verification Support
Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.
Deployment & Installation Assistance
Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.
Long-Term Technical Assurance
Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.
A:
It seamlessly handles both. It supports standard 1.25G Gigabit Ethernet and is fully compliant with IEEE 802.3ah-2004 protocols. It's a highly recommended solution for base station backhaul, secure network trunks, and regional fiber ring integrations. By
admin on
2026-05-15
A:
Yes. This is a true industrial-grade SFP transceiver rated for a -40°C to 85°C operating environment. The built-in DDM/DOM allows you to monitor the internal temperature in real-time, ensuring it won’t throttle or drop packets even in extreme unconditioned outdoor enclosures. By
admin on
2026-05-07
A:
Correct. To achieve the 100km long-haul reach at the 1550nm wavelength, it requires Single-Mode Fiber (SMF). You'll just need standard Duplex LC fiber patch cables to plug into the optical interface. By
admin on
2026-02-21
A:
No warnings at all. It's SFF-8472 MSA compliant and coded for seamless OEM compatibility. Our IT ops have run them on Cisco, Juniper, and Arista gear without a single compatibility hitch. By
admin on
2026-01-04
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character.
478340
310028
L***z
Argentina
Verified
Purchase
5 .0
2026-04-18
Ideal IEEE 802.3ah-2004 optical transceiver for extreme environments. Integrated them into unconditioned traffic control enclosures. Even during summer heatwaves hitting 80°C internally, the DDM showed stable laser bias and zero thermal throttling.
Please write comments with more than three
character.
478340
310038
A***g
France
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5 .0
2025-11-10
Deployed 50 of these LINK-PP LS-SM551G-A0I modules for a municipal fiber ring. The 1550nm 100km spec holds up perfectly over our 78km span with -25dBm receive power. Multi-brand compatibility is flawless.
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character.
478340
310037
S***l
Brazil
Verified
Purchase
5 .0
2025-10-09
As a network engineer, finding a true -40 to 85°C industrial SFP 1.25G transceiver supporting comprehensive DOM is rare at this price. Excellent Tx/Rx optical budget for remote outdoor cabinet backhaul. (ง'̀-'́)ง
Please write comments with more than three
character.
478340
310039
J***n
Spain
Verified
Purchase
5 .0
2025-01-17
We ran intensive bit-error rate testing on this duplex LC DOM SMF transceiver for our enterprise campus. The DFB laser and PIN receiver combination delivered zero errors over a 90km link.
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