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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 |
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Our rigorous screening process subjects each module to extensive performance benchmarks, ensuring reliable hardware execution and flawless data transmission across gigabit networks.
This verifies that the 1550nm centre wavelength complies with strict spectral width limits.
Evaluates transmitter signal quality to guarantee clean optical wave outputs and high extinction ratios.
Measures signal reception using PRBS test patterns to confirm a bit error rate below 1×10⁻¹².
Validates reliable device functionality across the standard case temperature range of 0 to +70°C.
Our professional shipping process protects your SFP modules throughout transit, ensuring safe, secure, and prompt delivery to our valued global destinations.
Modules are sealed in premium anti-static ESD bags for maximum safety.
Thick customized foam cushioning guards against physical impacts during transit.
Orders are rapidly processed and dispatched within minimal handling turnarounds.
Reliable international carriers provide secure express courier delivery directly to your door.
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.
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-40C 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) | 40km | 2km | 2km | 2km | 2km |
Cable Type | SMF | MMF | MMF | MMF | MMF |
TX Power | -5 to 0dBm | -12 to -3dBm | -9 to 0dBm | -12 to -3dBm | -9 to 0dBm |
Receiver Sensitivity | -23dBm | -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 run a mixed environment of Cisco Catalyst switches and Arista routers. Will this 1.25G 1550nm SFP work seamlessly across both without throwing unverified OEM errors? By D***e on 2026-03-03
A: Absolutely! The LS-SM551G-40C is fully MSA compliant and extensively tested for multi-vendor interoperability. It’s 100% plug-and-play with Cisco, Arista, Juniper, and other major brands. No "unsupported transceiver" warnings will interrupt your workflow. By admin on 2026-03-03
Q: Does this transceiver support DOM/DDM monitoring and is it compatible with the IEEE 802.3ah standard for our Ethernet deployment? By S***n on 2025-12-14
A: Yes! It fully supports IEEE 802.3ah-2004 for gigabit networking and complies with the SFF-8472 standard. The built-in DOM (Digital Optical Monitoring) allows real-time remote diagnostics of TX/RX power, voltage, and internal temperature directly via your switch's SNMP interface. By admin on 2025-12-14
Q: Just to confirm before ordering, does this module require single-mode or multimode fiber? And what connector type is on the optical interface? By M***l on 2025-11-02
A: This specific transceiver operates over standard Single-Mode Fiber (SMF) using a Duplex LC connector. It’s optimized for 1550nm long-haul transmission, ensuring stable optical links up to 40km for your network infrastructure. By admin on 2025-11-02
Q: My datacenter needs to deploy about 300 units for a metro network upgrade. Do you guys offer any bulk discounts or special B2B tier pricing for large volumes? By S***n on 2025-07-11
A: Yes, we do! We provide significant cost savings for bulk IT procurement. For an order of 300 units, the price drops considerably from the standard retail rate. Just reach out to our sales team for a custom quote to support your batch deployment. By admin on 2025-07-11
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