The Dell QDD-SR4.2-400G Compatible LINK-PP module is a QSFP-DD bidirectional (BiDi) transceiver module designed for high-density 400 Gigabit Ethernet interconnects. Operating over dual wavelengths of 850nm and 910nm using reliable VCSEL transmitters and PIN photodiode receivers, it utilizes an industry-standard MPO-12 interface over multimode fiber (MMF). The module supports link reaches of up to 70m over OM3 and 150m over OM5, and integrates built-in Digital Diagnostic Monitoring (DDM) for real-time transceiver health tracking.
Dell Part Number
QDD-SR4.2-400G
Vendor Name
LINK-PP
Form Factor
QSFP-DD
Max Data Rate
425Gbps
Connector
MTP/MPO-12 (UPC)
Media
MMF
Wavelength
850/910nm
Max Cable Distance
70m@OM3/150m@OM5
Transmitter Type
VCSEL
Receiver Type
PIN
Modulation (Electrical)
8x50G-PAM4
Modulation (Optical)
8x50G-PAM4
DDM/DOM
Supported
Operating Temperature Range
0°C to +70°C
Protocols
QSFP-DD MSA, IEEE 802.3-2015
Warranty
5 Years
Key Features of Dell QDD-SR4.2-400G Compatible LINK-PP 400G QSFP-DD
Dell QDD-SR4.2-400G Compatible LINK-PP module is a bidirectional QSFP-DD multimode transceiver compliant with 400GAUI-8 standards while consuming under 12W of power. Operating at 850nm and 910nm with an MPO-12 connector, it easily transmits data across 150m OM5 multimode links and features DDM diagnostics to keep your network running smoothly.
This QSFP-DD module complies fully with the 400GAUI-8 standard using advanced 8-lane 50Gbps PAM4 signaling. Operating with a maximum power consumption of under 12W, it maintains stable thermal efficiency in dense network switch chassis.
QDD-SR4.2-400G: 400 Gbps Connectivity for Intra-Data Center Links
Delivering 400Gbps bandwidth, this module easily connects core switches and servers inside modern data centers. It keeps high-volume intra-data center traffic flowing smoothly without delays or network congestion.
QDD-SR4.2-400G Module with 850/910nm Wavelength
Designed for bidirectional transmission over 850nm and 910nm wavelengths, the module employs reliable VCSEL transmitters to deliver stable, high-fidelity optical signals over multimode fiber. This dual-wavelength architecture doubles fiber utilization while reducing signal attenuation, ensuring consistent and low-latency connectivity for enterprise and cloud computing environments.
Reach capabilities extend up to 150 meters when paired with standard OM5 multimode fiber cabling systems. Such extended distance covers cross-rack, inter-row, and distribution-tier cabling across typical computer room footprints.
QDD-SR4.2-400G Module with MPO-12 Interface
A multi-fiber push-on MPO-12/UPC optical receptacle facilitates quick, low-loss trunk cabling connections. The familiar 12-fiber connector design streamlines fiber installation and integrates smoothly into existing multimode patch panels.
QDD-SR4.2-400G Module with DDM for Real-Time Monitoring
Built-in digital diagnostic monitoring (DDM) continuously tracks key working parameters, including operating temperature, supply voltage, laser bias current, and optical Rx/Tx power. These real-time diagnostics allow network administrators to quickly spot link abnormalities and fix potential faults before any downtime occurs.
Dell QDD-SR4.2-400G Compatible LINK-PP 400G QSFP-DD BiDi transceiver module complies with rigorous international regulatory and manufacturing standards, holding certifications including ISO 9001, CE, RoHS, and FCC.
Comprehensive factory testing rigorously evaluates signal integrity and overall device performance to meet high enterprise standards.
QDD-SR4.2-400G Quality Certifications
These verified credentials confirm that every transceiver module meets strict environmental, safety, and operational criteria before leaving the factory.
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.
QDD-SR4.2-400G Certified for Reliable Host-Device Compatibility
Extensive switch-side validation ensures seamless plug-and-play operation and stable interoperability across major networking host systems.
Each 400G QSFP-DD bidirectional module completes strict quality checks to maintain clean signal delivery and seamless network operation under demanding workloads. Explore our full verification standards at the LINK-PP Test Support Center.
Optical Spectrum Test
Measure central wavelengths to confirm precise laser emission standards.
Eye Pattern Test
Analyze optical signal quality to prevent waveform distortion issues.
Bit Error Rate Test
Verify continuous data accuracy to avoid packet delivery faults.
Temperature Test
Assess thermal tolerance limits to guarantee steady environmental stability.
Product Shipping for Dell QDD-SR4.2-400G Compatible LINK-PP 400G QSFP-DD
Every QDD-SR4.2-400G QSFP-DD BiDi transceiver module is carefully packaged and processed to guarantee safe transit to your facility. Our coordinated fulfillment procedures ensure prompt, dependable order dispatches for all enterprise deployments.
Anti-Static Protective Packaging
Protect sensitive internal components against electrostatic discharge damage risks.
Shock-Resistant Transport Protection
Shield delicate optical hardware from mechanical impacts during shipment.
Fast Order Processing and Dispatch
Prepare confirmed warehouse inventory quickly for prompt carrier pickup.
Global Logistics and International Delivery
Deliver orders safely to enterprise destinations around the world.
Gently slide the QDD-SR4.2-400G BiDi transceiver module into the QSFP-DD switch port until it clicks firmly into place, then connect an MPO-12 multimode fiber patch cord to establish the dual-wavelength link. Utilizing bidirectional (BiDi) transmission over multimode fiber, this module provides cost-effective, high-density 400G connectivity for short-reach intra-data center architectures, including top-of-rack (ToR) switching, distribution tiers, and high-speed aggregation rows.
QDD-SR4.2-400G Technical Support
LINK-PP offers end-to-end technical support, from pre-sales consultation to post-deployment assistance, ensuring smooth integration and reliable network performance.
Pre-Sales Technical Consultation
Professional guidance to help you select the optimal QDD-SR4.2-400G module for your network design and application needs.
Compatibility Verification Support
Validated compatibility with LINK-PP switches and other mainstream networking platforms for seamless deployment.
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.
A:
The module features a maximum power consumption of just 12W operating on a single 3.3V power supply. This low thermal footprint helps maintain energy efficiency in high-density 400G Ethernet switch deployments. By
admin
A:
Yes. Bend-insensitive OM3 or OM5 MPO-12 multimode patch cables are a good fit for crowded racks. They help reduce bend-related optical loss and support stable 400G PAM4 links. Please follow the patch cable’s bend-radius rating and avoid sharp bends or tight cable ties. By
admin
A:
It complies with the standard 400GAUI-8 electrical interface using 8 lanes running at 53.125Gb/s. This ensures seamless plug-and-play compatibility with standard QSFP-DD host switch ports. By
admin
Our operations team likes that this module exposes DDM/DOM information. We can quickly compare module temperature and optical readings during routine checks instead of waiting for a problem. The 400GBASE-SR4.2 link has remained stable in our indoor rack environment.
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496199
524362
L***g
Sweden
Verified
Purchase
5 .0
2026-07-09
Deployed across our high-performance compute cluster. The QSFP-DD form factor seated smoothly, and DDM diagnostics show very stable optical power levels.
Please write comments with more than three
character.
496199
524370
P***h
Argentina
Verified
Purchase
5 .0
2026-06-18
We installed these 400GBASE-SR4.2 QSFP-DD optics between two rows in a data center. The 850/910nm BiDi design let us keep the existing MPO-12 multimode cabling instead of pulling more fiber. All links trained normally, and DOM values looked consistent across the batch.
Please write comments with more than three
character.
496199
524366
S***r
Bulgaria
Verified
Purchase
5 .0
2026-03-16
We needed a practical 400G MMF transceiver for a server room expansion, not a long-reach single-mode solution. This one matched our short-reach layout well. The MTP/MPO-12 UPC interface made installation simple, and the 8x50G PAM4 links have been stable since deployment.
Please write comments with more than three
character.
496199
524368
B***r
Philippines
Verified
Purchase
5 .0
2026-02-18
For a new high-speed NAS and compute cluster, this was a cost-effective way to use our existing multimode backbone for 400G uplinks. The QSFP-DD form factor fit our hardware as expected. No errors found after several weeks of normal use.
Please write comments with more than three
character.
496199
524372
D***z
Taiwan, Province of China
Verified
Purchase
4 .0
2026-02-08
Good 400G QSFP-DD BiDi transceiver for our OM5 room links. Packaging could use a bit more padding, although every module passed our incoming inspection.
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496199
524364
J***s
Japan
Verified
Purchase
5 .0
2025-11-16
Outstanding modules for modern 400G Ethernet cloud infrastructure. We ran them over OM5 fiber up to 130m without signal degradation. The MPO-12 UPC connector provides a tight, secure click on patch panels.
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496199
524373
J***n
Lithuania
Verified
Purchase
5 .0
2025-09-13
Used four units for an indoor campus core refresh. Our OM5 trunks are around 110m, and every 400G connection has stayed clean under production traffic. The modules run at normal data center temperatures and the DDM data is useful for our regular health checks. :-)
Please write comments with more than three
character.
496199
524367
D***d
Germany
Verified
Purchase
5 .0
2025-07-01
Perfect 400G QSFP-DD solution for our enterprise data center upgrade. Running bidirectional 850/910nm signals over existing MPO-12 trunk cables saved us a ton on recabling costs.
Please write comments with more than three
character.
496199
524365
M***a
France
Verified
Purchase
5 .0
2025-04-19
We used these QSFP-DD BiDi transceivers for short-reach data center interconnect between two adjacent server halls. The bidirectional 850/910nm design let us double bandwidth without pulling new cables.
United States · English · USD
