Generic SFP1G-LX-31 Compatible 1000BASE-LX SFP 1310nm 20km Duplex LC SMF DOM Transceiver Module
P/N:
LS-SM311G-20C
Manufacturer:
LINK-PP
Compatible Brand:
Generic
Compatible P/N:
SFP1G-LX-31
- Compatible Brands: Generic
- Form Factor: SFP
- Data Rate: 1G
- Distance: ≤20km
- Type: Single Mode
- Connector: Duplex LC
- Wavelength: 1310nm
- P/N: LS-SM311G-20C
- Manufacture: LINK-PP
- Compatible Brand: Generic
- Compatible P/N: SFP1G-LX-31
Before You Deploy: SMF vs MMF Safety Checklist
To ensure flawless Layer-1 functionality in your generic switching environments, verify your Outside Plant (OSP) fiber infrastructure:
- Standard Deployment (SMF): Connect directly to OS1/OS2 Single-Mode Fiber (9/125µm) using standard Duplex LC patch cords for the full 20km reach.
- Legacy Deployment (MMF): If deploying over legacy Multimode Fiber, you MUST use a Mode Conditioning Patch (MCP) cable. Injecting a 1310nm laser directly into MMF will cause Differential Mode Delay (DMD). Distance on MMF is strictly capped at 550m.
- Robust Overload Protection: This module features a superior receiver overload threshold of -1.0 dBm, meaning it is perfectly safe to test back-to-back on a lab bench without optical attenuators.
Comprehensive Technical Specifications
Constructed with a Class I laser safety compliant FP transmitter and a PIN photodiode integrated with a trans-impedance preamplifier (TIA).
| LINK-PP Part Number | LS-SM311G-20C | Generic Compatible | SFP1G-LX-31 |
| Form Factor | SFP | Max Data Rate | 1.25Gbps |
| Wavelength | 1310nm | Max Cable Distance | 20km |
| Connector | Duplex LC | Optical Components | FP 1310nm |
| Media | SMF | DOM Support | Yes |
| TX Power | -9 to 0dBm | RX Power | -23 to -1dBm |
| Receiver Sensitivity | -23dBm | Receiver Overload | -1dBm |
| Operating case temperature | 0 to 70°C | Protocols | SFF-8472 MSA Compliant, IEEE 802.3ah-2004, IEEE 802.3z |
Optical Power & Link Budget Analysis
The "LH" (Long Haul) classification guarantees a larger optical receiver sensitivity, providing critical margin for aging fiber splices or dense patch panel environments.
| Parameter | Specification Limit | Diagnostic Note |
|---|---|---|
| Transmit Power (Tx) | -9.0 dBm to 0.0 dBm | Consistent 1310nm FP laser output. |
| Receiver Sensitivity (Rx) | -23.0 dBm | Superior sensitivity allows the module to detect faint signals over 20km. |
| Receiver Overload | -1.0 dBm | Highly resilient to saturation; safe for very short patch cable connections. |
| Optical Link Budget | 14.0 dB | (Calculated from minimum Tx of -9.0dBm and Rx sensitivity of -23.0dBm). |
Architectural Advantage: IEEE 802.3ah-2004 (EFM) Compliance
First Mile Deployment Ready: Unlike standard campus optics that only support IEEE 802.3z, this module complies with IEEE 802.3ah-2004 (Ethernet in the First Mile). This makes the LS-SM311G-20C the perfect choice for Wireless ISPs (WISPs) and Carrier Ethernet providers delivering robust point-to-point (P2P) optical subscriber links directly to customer premises.
Procurement Strategy: Why Choose a 20km LX/LH Module?
IT directors architecting campus networks often face a dilemma: standard 10km LX modules may lack the optical budget to overcome degraded legacy fiber plants.
| Specification Focus | Standard LX (10km) | LX/LH (20km - This Module) |
|---|---|---|
| Optical Link Budget | ~ 10.5 dB | 14.0 dB |
| Tolerance for Splice Losses | Low (Strict 10km limit) | High (Can sustain multiple dirty patch panels/splices) |
| Lab Testing / Short Links | Attenuator sometimes needed | Safe (-1dBm overload threshold) |
Engineering Validation: Verifying MSA Compliance in Linux NOS
In generic white-box switching (like Cumulus Linux, SONiC, or standard Linux servers), verify EEPROM MSA integrity and poll real-time DOM health directly using native Linux ethtool utility.
user@whitebox:~$ ethtool -m swp1
Identifier : 0x03 (SFP)
Extended identifier : 0x04 (GBIC/SFP defined by 2-wire interface ID)
Connector : 0x07 (LC)
Transceiver type : Ethernet: 1000BASE-LX
Wavelength : 1310nm
Vendor name : LINK-PP
Vendor PN : LS-SM311G-20C
Optical diagnostics support : Yes
Laser bias current : 16.420 mA
Transmit avg optical power : 0.3162 mW / -5.00 dBm
Rcvr signal avg optical power : 0.0316 mW / -15.00 dBm
Diagnostic Baseline: In the example above, the Rcvr signal avg optical power is -15.00 dBm. Since this module has a verified Receiver Sensitivity of -23.0 dBm, this leaves a safe 8.0 dB operating margin. As long as Rx power remains between -1.0 dBm and -23.0 dBm, the Layer-1 link is perfectly healthy.
Frequently Asked Questions
What is the difference between standard LX and LX/LH?
Standard 1000BASE-LX is typically rated for 10km. The "LH" (Long Haul) designation in this 20km module indicates a larger 14dB optical budget, allowing it to push signals further or overcome dirty fiber splices.
Can I use this 1310nm SMF module over legacy Multimode Fiber (MMF)?
Yes, but strictly up to 550 meters, and you must use a Mode Conditioning Patch (MCP) cable. Connecting it directly to OM1/OM2 MMF without an MCP will cause Differential Mode Delay (DMD) and link failure.
Is this generic module compatible with Ubiquiti and MikroTik?
Yes. The EEPROM is programmed to strict MSA (Multi-Source Agreement) standards without proprietary vendor locks, ensuring native plug-and-play recognition in open NOS and white-box switches.
What does IEEE 802.3ah-2004 compliance mean for this module?
It means the module supports "Ethernet in the First Mile" (EFM) standards, making it highly reliable for Carrier Ethernet, ISP subscriber access links, and point-to-point OAM networks.
Packaging, Shipping and Global Delivery for Networking Products
Anti-static packaging, shock-resistant protection, fast order dispatch, and reliable worldwide delivery for all LINK-PP networking products.
Anti-Static Protective Packaging
Protect networking products from electrostatic discharge and handling-related damage.
Shock-Resistant Transport Protection
Protect products against physical impacts during storage and international transportation.
Fast Order Processing and Dispatch
Accelerate order handling to ensure quick warehouse deployment.
Global Logistics and International Delivery
Ship products efficiently to customers across worldwide locations.
1G SFP Technical Support and Deployment Assistance
LINK-PP provides expert technical support, from product selection and compatibility verification to deployment and long-term operation.
Pre-Sales Technical Consultation
Technical consultation to help you verify SFP1G-LX-31 compatibility and select the appropriate product for your application.
Compatibility Verification Support
Verification support to help ensure compatibility with your equipment, applications, and deployment requirements.
Deployment & Installation Assistance
Comprehensive step-by-step guidance for installation, configuration, and initial setup, ensuring accurate deployment and reliable, stable operation from the start.
Long-Term Technical Assurance
Ongoing technical support throughout the product lifecycle, delivering long-term stability for enterprise and carrier-grade networks.
Industry Standards, Compliance and Quality Assurance
LINK-PP products are manufactured under recognized quality management systems and designed to support applicable industry standards, regulatory compliance, and long-term deployment requirements, including IEEE 802.3, RoHS, REACH, ISO 9001, and ISO 14001 where applicable. 「View Quality & Compliance Center」
ISO 9001 Quality Management
Manufactured under certified quality management processes to ensure consistent product quality and production control.
IEEE 802.3 Standards Compliance
Designed in accordance with applicable networking and Ethernet standards, including IEEE specifications where relevant.
RoHS Compliance
Manufactured using materials that support restrictions on hazardous substances for global market requirements.
REACH Compliance
Material declarations and supply chain processes support applicable REACH regulatory requirements.
Product Safety Assurance
Selected products support recognized safety and reliability requirements for networking applications.
Reliability Verification Testing
Products undergo verification and quality testing to support stable operation in enterprise, telecom, and industrial environments.
1G SFP Warranty and After-Sales Service
LINK-PP provides warranty coverage and after-sales support to help ensure stable operation and long-term product performance.
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
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