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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 |
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.
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.
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.
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.
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.
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.
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.
This optical transceiver is fully certified under rigorous international standards, confirming its safety, environmental friendliness, and manufacturing excellence for global networking deployments.
Every single transceiver undergoes a comprehensive automated quality testing program, validating parametric performance, structural integrity, and long-term functional stability before leaving our facility.
The module strictly complies with CE, FCC, RoHS, and ISO9001 quality management standards, ensuring environmentally responsible manufacturing and dependable operational safety.
Comprehensive EEPROM coding and rigorous hardware verification guarantee seamless compatibility with major industry switch, router, and media converter platforms.
Our comprehensive multi-stage testing procedure validates every technical specification, ensuring that each SFP module delivers exceptional field reliability and optimal network uptime.
Advanced spectral analysis verifies central wavelength accuracy and side-mode suppression ratio standards.
Oscilloscope eye diagram analysis confirms excellent signal-to-noise ratios and low transmitter jitter.
Extensive bit error rate testing guarantees flawless data packet delivery and transmission integrity.
Thermal chamber cycling validates reliable, stable performance across the full commercial temperature range.
Our optimized global shipping process ensures that your optical components arrive safely, securely, and completely on schedule, ready for immediate network deployment.
Each module is sealed inside customized ESD packaging to prevent electrostatic damage.
Cushioned multi-slot trays safeguard the delicate optical interfaces against mechanical impact during transport.
Our efficient warehousing system ensures rapid order validation, secure packaging, and immediate dispatch.
Partnering with premium international couriers guarantees reliable, tracked doorstep delivery to global destinations.
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.
LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.
Professional technical guidance to help customers select the most suitable LS-SM551G-A2C modules based on network architecture and application requirements.
Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.
Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.
Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.
LINK-PP provides after-sales support for the smooth deployment and reliable operation of the optical modules.
15-day no-reason return and refund
Free replacement for dead-on-arrival (DOA) or defective items within the initial period
Free repair services for manufacturing defects throughout the warranty period
Warranty exclusions and conditions apply
Compatible | LINK-PP | LINK-PP | LINK-PP | LINK-PP | LINK-PP |
Data Rate (Max) | 1.25Gbps | 1.25Gbps | 1.25Gbps | 1.25Gbps | 1.25Gbps |
Wavelength | 1550nm | 1310nm | 850nm | 1310nm | 850nm |
Connector | Duplex LC | Duplex LC | Duplex LC | Duplex LC | Duplex LC |
Cable Distance (Max) | 120km | 2km | 2km | 2km | 2km |
Cable Type | SMF | MMF | MMF | MMF | MMF |
TX Power | 0 to +5dBm | -12 to -3dBm | -9 to 0dBm | -12 to -3dBm | -9 to 0dBm |
Receiver Sensitivity | -28dBm | -30dBm | -18dBm | -30dBm | -18dBm |
Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | -40 to 85°C | -40 to 85°C |
Form Factor | SFP | SFP | SFP | SFP | SFP |
Transmitter Type | DFB | FP | VSCEL | FP | VSCEL |
Receiver Type | PIN | PIN | PIN | PIN | PIN |
DOM Support | Yes | Yes | Yes | Yes | |
Protocols | SFF-8472 MSA Compliant, IEEE 802.3ah-2004 | SFF-8472 MSA IEEE 802.3 | IEEE 802.3z, SFF-8472, FC-PI, SFP MSA (INF-8074i) Compliant | SFF-8472 MSA IEEE 802.3 | IEEE 802.3z, SFF-8472, FC-PI, SFP MSA (INF-8074i) Compliant |
| Pictures | ID# | Description | Price | Stock | Add to Cart |
Q: We're planning a massive DC deployment and need about 200 units of these duplex lc smf transceivers. Do you offer B2B bulk discounts? By S***r on 2026-04-17
A: Yes, absolutely! For volume purchases like bulk deployments over 100 units, we provide special tiered pricing and dedicated B2B account support. Please hit up our live chat or email sales for a custom wholesale quote. By admin on 2026-04-17
Q: The specs say operating temp is 0 to 70°C. I need to install these in an unconditioned outdoor cabinet for cell tower backhaul. Do you have an industrial version? By M***z on 2026-01-10
A: Good catch! The LS-SM551G-A2C is commercial grade (0~70°C) suited for indoor server racks. For harsh outdoor environments, we highly recommend our industrial-grade equivalent which supports extreme temperatures from -40°C to 85°C. You can search for our "LS-SM551G-A2I" model on the site. By admin on 2026-01-10
Q: Can this DOM sfp module support IEEE 802.3ah-2004 for our specific OAM requirements on a metro ethernet ring? By N***e on 2025-10-24
A: Yes! It fully complies with IEEE 802.3ah-2004 and SFF-8472 protocols. The built-in DOM (Digital Optical Monitoring) feature ensures you can reliably poll real-time diagnostic data like TX/RX power and temperature directly via your network management system. By admin on 2025-10-24
Q: Just to be 100% sure before I order, does this optic require single-mode or multi-mode fiber, and what connector type is needed? By J***n on 2025-10-09
A: This transceiver is specifically designed for Single-Mode Fiber (SMF) to achieve the 120km max distance. You will need a standard Duplex LC connector patch cable to link them up properly. By admin on 2025-10-09
Q: Hey there, looking to drop this into a mix of Cisco Catalyst and Aruba switches. Will this 1.25g sfp 1550nm module face any vendor-lock issues? By C***s on 2025-07-02
A: Hi! This module is completely MSA compliant and uses standard EEPROM coding. It works seamlessly across multi-brand environments including Cisco, Aruba, and Ubiquiti without triggering any unsupported transceiver warnings. By admin on 2025-07-02
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