The LINK-PP 1.25G 1x9 transceiver delivers high-speed, robust optical communication for demanding industrial applications. Featuring a standard duplex SC interface, it supports highly stable 1.25Gbps data rates. Operating reliably in extreme temperatures from -40°C to 85°C, it utilizes premium FP lasers to ensure uninterrupted connectivity across 550m multimode fiber networks.
LINK-PP Part Number
L9-SD311G-S5CTI
Vendor Name
LINK-PP
Form Factor
1x9
Max Data Rate
1.25Gbps
Wavelength
1310nm
Max Cable Distance
550m
Fiber Interface
Duplex SC
Fiber Type
MMF
Transmitter Type
FP
Receiver Type
PIN
Differential Input/ Output
CML
Signal Detect
TTL
Power Supply
3.3V
Operating Temperature Range
-40 to 85°C
Key Features of LINK-PP L9-SD311G-S5CTI
The LINK-PP L9-SD311G-S5CTI is an industrial-grade 1x9 transceiver supporting 1.25Gbps data rates. Equipped with a 1310nm FP laser, it enables seamless 550m transmission over multimode fiber. Featuring a 3.3V power supply and duplex SC interface, it guarantees exceptional performance from -40°C to 85°C.
Standard 1x9 Package for Reliable PCB Mounting
Featuring a classic 1x9 through-hole package, this optical transceiver is designed for direct PCB mounting. This rugged physical integration provides superior anti-vibration capabilities, ensuring maximum reliability for industrial automation, communication, and heavy transport equipment.
1.25G Connectivity for Video Transmission System
Delivering a seamless 1.25Gbps data rate, this optical module is perfectly optimized for digital video transmission systems. It guarantees high-speed, latency-free communication, ensuring smooth, uncompressed video streaming for demanding security surveillance and broadcasting tasks.
1310nm Wavelength for Optimal Multimode Performance
Operating precisely at a 1310nm center wavelength, the internal FP laser diode ensures exceptional signal integrity. It provides optimal multimode fiber performance by effectively minimizing dispersion during high-speed, continuous data transmission processes.
Stable 550m Transmission for Short-Reach Networks
Engineered specifically for short-reach local area networks, the transceiver achieves up to 550 meters of stable transmission over 50/125μm multimode optical fiber. This makes it an ideal networking solution for interconnections and factory floors.
Duplex SC Interface with Low EMI Design
The module features a standard duplex SC receptacle optical interface. Its robust physical housing and isolated circuit design naturally minimize electromagnetic interference, ensuring clean signal outputs even in electrically noisy industrial environments.
LINK-PP L9-SD311G-S5CTI 1.25G 1x9 Certification
The LINK-PP L9-SD311G-S5CTI 1.25G 1x9 series strictly complies with international standards, holding CE, FCC, UKCA, UL, and REACH certifications for safe global industrial deployments.
Every optical transceiver undergoes a strict quality control and testing program in the factory, ensuring precise output, minimal packet loss, and completely reliable long-term networking performance.
These optical modules strictly meet Class 1 Laser Safety Standard requirements. They offer excellent electrostatic discharge protection and EMI regulatory compliance for secure, uninterrupted industrial operations.
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.
Certified for Seamless PCB Integration & Protocol Compatibility
Fully compliant with the Multi-Sourced 1x9 protocol, this industrial transceiver is certified for seamless PCB integration, supporting Gigabit Ethernet and Fiber Channel communication standards flawlessly.
Rigorous Testing Ensures Reliable 1x9 Performance
Advanced testing procedures are strictly implemented during manufacturing. This rigorous approach ensures each 1.25G 1x9 optical transceiver delivers dependable, top-tier industrial performance.
Optical Spectrum Test
Analyzes center wavelength and spectral width to guarantee highly precise optical signal transmission.
Eye Pattern Test
Verifies complete signal integrity and compliance with IEEE 802.3 optical output eye diagram standards.
Bit Error Rate Test
Evaluates data accuracy under PRBS patterns to ensure virtually zero packet loss during transmission.
Temperature Test
Simulates extreme environments from -40°C to 85°C to confirm reliable industrial-grade temperature durability.
Product Shipping for LINK-PP L9-SD311G-S5CTI 1.25G 1x9
We guarantee secure product shipping for the LINK-PP 1.25G 1x9 modules, utilizing professional packaging materials to prevent transit damage completely.
Anti-Static Protective Packaging
Modules are sealed in ESD-safe bags to prevent electrostatic component damage.
Shock-Resistant Transport Protection
Custom foam trays securely hold components, absorbing severe impacts during transportation.
Fast Order Processing and Dispatch
Orders are rapidly processed and dispatched directly from our automated facilities.
Global Logistics and International Delivery
Partnering with leading carriers to ensure swift and traceable worldwide shipping.
To use this transceiver, insert its 9 pins into the PCB and manually solder them securely. Next, power the board with a stable 3.3V supply. Finally, plug a duplex SC multimode fiber cable into the optical ports to instantly establish a 1.25Gbps data connection.
L9-SD311G-S5CTI 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 L9-SD311G-S5CTI 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:
No external pull-up is required—Pin 4 outputs a standard TTL-compatible logic level (HIGH for normal optical input, LOW for loss of signal) that connects directly to 3.3V CMOS/TTL switch controller pins. By
admin
A:
Yes, it uses the standard Multi-Sourced 1x9 SIP 9-pin through-hole footprint with 3.3V differential CML data and TTL Signal Detect, making it a direct drop-in replacement for legacy 1.25Gbps 1310nm Duplex SC 1x9 modules over multimode fiber up to 550m. By
admin
A:
At 1310nm, older 62.5/125μm (OM1) and 50/125μm (OM2) multimode fibers exhibit significantly lower attenuation and higher modal bandwidth than at 850nm, allowing the L9-SD311G-S5CTI to reach up to 550m cleanly over legacy plant MMF cabling. By
admin
A:
We have no strict MOQ for sample evaluation, and we offer tiered OEM discounts starting at 50, 200, and 1,000 units, complete with custom tray packaging and fast DHL/FedEx air freight. By
admin
A:
Yes, the L9-SD311G-S5CTI is industrial-grade (-40°C to +85°C case temperature) with low 3.3V power dissipation, designed specifically for fanless DIN-rail switches and sealed outdoor cabinets. By
admin
Please write comments with more than three
character.
496510
576587
D***i
Croatia
Verified
Purchase
5 .0
2026-09-17
Finding an industrial 1.25G 1x9 transceiver with a 1310nm FP laser for 550m multimode fiber was tough until we found LINK-PP L9-SD311G-S5CTI. It saved our hospital campus fiber network from costly re-cabling.
Please write comments with more than three
character.
496510
576576
J***l
Lithuania
Verified
Purchase
5 .0
2026-08-29
Our embedded engineering team qualified the L9-SD311G-S5CTI across -40°C to +85°C for an industrial Gigabit NAS and switch uplink card. Optical launch power, receiver sensitivity, and 3.3V current stayed well within datasheet margins.
Singapore · English · SGD
