The LINK-PP LS-BL55491G-20C is a high-performance Gigabit Ethernet transceiver specifically designed for cost-effective networking. This top-tier 1.25Gbps optical module operates efficiently over single-mode fiber, delivering a highly reliable 20km reach. Featuring advanced BiDi SFP specs, it ensures seamless data transmission while minimizing infrastructure costs for modern enterprise environments.
LINK-PP Part Number
LS-BL55491G-20C
Vendor Name
LINK-PP
Form Factor
SFP
Max Data Rate
1.25Gbps
Wavelength
1550nm-TX/1490nm-RX
Max Cable Distance
20km
Connector
Simplex LC
Media
SMF
Transmitter Type
DFB
Receiver Type
PIN
TX Power
-9 to 0dBm
RX Power
-23 to -1dBm
Receiver Sensitivity
-23dBm
DOM Support
Yes
Operating Temperature Range
0 to 70°C
Protocols
Fast Ethernet, Gigabit Fibre Channel, MSA Compliant
Key Features of LINK-PP LS-BL55491G-20C 1G BiDi SFP
This hot-pluggable WDM transceiver offers exceptional capabilities, including low power consumption and high signal integrity. The robust 1G bidirectional SFP features an MSA-compliant design, ensuring wide compatibility with major brand switches. It provides a stable 3.3V power supply for optimal enterprise networking efficiency.
This commercial-grade 1G BiDi SFP optical module utilizes a premium DFB laser and PIN photodetector. It guarantees exceptional optical performance, making this 1.25Gbase-BX transceiver a durable choice for long-lasting data center connectivity.
LS-BL55491G-20C: 1G Connectivity for Carrier Ethernet
Engineered for seamless telecommunications, this module provides flawless 1G connectivity for Carrier Ethernet applications. The high-speed fiber optic transceiver supports Gigabit Ethernet and 1.063Gbps Fiber Channel, ensuring uninterrupted backbone network operations.
LS-BL55491G-20C Module with 1550nm-TX and 1490nm-RX Wavelength
Utilizing innovative wavelength division multiplexing, the module with 1550nm-TX and 1490nm-RX wavelength maximizes bandwidth. This single-fiber optical module allows simultaneous transmit and receive functions, dramatically reducing cabling expenses for extensive network deployments.
Ideal for metropolitan area networks, the LS-BL55491G-20C module supporting 20km transmission excels in long-distance routing. This long-reach SFP transceiver maintains excellent signal clarity across standard single-mode optical fibers without requiring additional amplifiers.
LS-BL55491G-20C Module with Simplex LC Interface
Built for precise connections, the LS-BL55491G-20C module with simplex LC interface easily integrates into existing patch panels. The standard LC receptacle optical transceiver ensures low insertion loss and secure physical mating for network hardware.
LS-BL55491G-20C Module with DOM for Real-Time Monitoring
Compliant with SFF-8472, the LS-BL55491G-20C module with DOM for real-time monitoring allows administrators to track critical parameters. This digital diagnostic monitoring SFP reports temperature, voltage, and laser bias to prevent unexpected network downtime.
LINK-PP LS-BL55491G-20C 1G SFP Certification
The LINK-PP LS-BL55491G-20C 1G SFP certification ensures strict compliance with international industry standards, offering users a fully verified, safe, and eco-friendly optical communication networking solution.
Our comprehensive LS-BL55491G-20C quality testing program evaluates every unit under extreme conditions, ensuring this 1.25G optical transceiver maintains peak operational stability before reaching your facility.
LS-BL55491G-20C Quality Certifications
Earning prestigious LS-BL55491G-20C quality certifications, this pluggable module is fully CE, FCC, UKCA, UL, and REACH compliant, guaranteeing safe electromagnetic compatibility and environmental sustainability worldwide.
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-BL55491G-20C Certified for Reliable Host-Device Compatibility
The LS-BL55491G-20C certified for reliable host-device compatibility seamlessly works alongside major networking equipment. This MSA-compliant Gigabit module prevents vendor lock-in while providing stable switch integration.
Rigorous Testing Ensures Reliable SFP Performance
Rigorous testing ensures reliable SFP performance across all environments. Every fiber transceiver undergoes detailed technical inspections to guarantee absolute data transmission precision.
Optical Spectrum Test
The optical spectrum test verifies the 1550nm wavelength stability and perfect side-mode suppression.
Eye Pattern Test
An advanced eye pattern test confirms excellent signal integrity and minimal jitter output.
Bit Error Rate Test
The bit error rate test guarantees zero packet loss during continuous high-speed data transfers.
Temperature Test
A thorough temperature test validates flawless commercial operation between zero and seventy degrees.
Product Shipping for LINK-PP LS-BL55491G-20C 1G SFP
The product shipping for LINK-PP LS-BL55491G-20C 1G SFP prioritizes speed and safety, ensuring your networking hardware arrives completely intact and deployment-ready.
Anti-Static Protective Packaging
Premium anti-static protective packaging shields the sensitive optical transceiver components.
Shock-Resistant Transport Protection
Durable shock-resistant transport protection prevents any physical damage during transit.
Fast Order Processing and Dispatch
We guarantee fast order processing and dispatch for urgent network upgrades.
Global Logistics and International Delivery
Efficient global logistics and international delivery ensure timely arrival anywhere worldwide.
The LINK-PP LS-BL55491G-20C 1G SFP usage demonstration highlights effortless hot-swappable installation. Simply insert the BiDi optical module into a compatible switch port, connect the simplex LC fiber, and instantly establish a stable Gigabit Ethernet connection.
LS-BL55491G-20C 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-BL55491G-20C 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:
Absolutely. We offer aggressive tiered pricing for B2B procurement and IT batch deployments. Just hit up our sales team and they’ll sort out a great volume quote for you. By
admin on
2026-05-11
A:
If your outdoor enclosure has basic climate control, this commercial 0-70°C module works great. But for extreme, unregulated environments, we definitely suggest grabbing our industrial-grade (-40 to 85°C) equivalent for safe backhaul routing. By
admin on
2026-05-02
A:
Yes! It’s fully MSA compliant and engineered for seamless OEM compatibility across major brands like Cisco, Aruba, and Juniper. It’s plug-and-play with no CLI workarounds needed. By
admin on
2026-02-18
A:
Yes, they do. The built-in Digital Optical Monitoring (DOM) lets your network admins pull real-time data on temperature, voltage, and TX/RX power to keep your Gigabit Ethernet links rock solid. By
admin on
2026-02-08
Deployed these 1550nm-TX/1490nm-RX optics for our campus fiber network. Flawless DOM integration with our Cisco switches. DFB laser handles 20km SMF easily. Great TCO for enterprise B2B procurement!
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491575
398689
D***n
Chile
Verified
Purchase
5 .0
2026-03-25
Bought a batch of these simplex LC DOM modules for a data center upgrade. DDM reads are highly accurate. Solid Gigabit Fibre Channel performance without breaking the IT budget.
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491575
398688
S***t
Austria
Verified
Purchase
5 .0
2025-09-16
Tested the MSA compliant 1.25G transceiver in our outdoor telecom cabinet. Despite the 0-70°C commercial rating, it stayed cool. Perfect for cell tower base station backhaul setups.
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491575
398698
A***v
Russian Federation
Verified
Purchase
5 .0
2025-06-20
Easy shopping. Nice option to compare different items making it an easy and the best choice. I like dealing with LINK-PP because they are always working to improve, making it easy for the buyer to purchase at the best price.
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491575
398692
L***n
France
Verified
Purchase
5 .0
2025-03-02
Using this single-mode WDM SFP for a long-distance homelab NAS link. OEM compatibility is spot on with my Ubiquiti gear. -23dBm receiver sensitivity ensures zero packet loss.
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491575
246091
M***y
Malaysia
Verified
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5 .0
2023-05-24
We've communicate with several companies before and they were not able to offer enough amount we expected. But Link pp did it. Would like to do business again with them.
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491575
246090
C***r
Brunei Darussalam
Verified
Purchase
5 .0
2023-05-16
This is honestly my favorite and go-to place to order all my rj 45needs. The shipping is great! Customer service excellent! I would recommend this company to anyone!!!
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491575
246100
H***s
Belgium
Verified
Purchase
5 .0
2023-04-07
I love these items, they are excellent. I ordered and deployed several of these for my switches, haven’t had any issues so far. Easy to install as expected and they increased my internal speed! Compared to the Cisco version,
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