400G QSFP-DD to 2 x 200G QSFP56 DAC
400G QSFP-DD to 2 x 200G QSFP56 DAC

400G QSFP-DD to 2 x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable

TLP-QDD-400GF2Q56-DAC

Tested in Targeted Switches for Superior Performance, Quality, and Reliability.

400G QSFP56 Breakout DAC for NVIDIA DGX Spark AI Clusters.

Max. Power Consumption 0.1W Per End, and Has Near Zero-latency Delays.

Supports 400G to 2x 200G Ethernet Interoperability.

Minimum Bend Radius 39.5mm for Flexible Routing.

Simplifies Patching and Offers a Cost-effective Way for Short Links.

8x50G PAM4 Retimed 400GAUI-8 Electrical Interface.

Low Insertion Loss and Ultra-low Crosstalk for Improved Performance.

Hot Pluggable QSFP-DD and QSFP56 MSA Compliant.

The 400G QSFP-DD to 2xQSFP56 breakout cables deliver high performance and cost-effective 400G interconnects, supporting configurations such as 2x200G or 2x100G for flexible network designs. It is fully compliant with SFF-8679, QSFP-DD MSA, IEEE802.3bj, and IEEE802.3cd standards. They are commonly used to connect multiple DGX Spark nodes to a 400G switch, forming a compact desktop-level AI cluster.
Specification
[Form Factor],[ QSFP-DD to 2x QSFP56]|[Cable Length],[0.5M-3M]|[Wire AWG],[28AWG]|[Power Consumption],[<0.1W]|[Jacket Material],[PVC]|[Minimum Bend Radius],[39.5mm]|[Case Temperature (℃)],[0 to 70°C (32 to 158°F)]|[Application],[400G Ethernet]|
Design and Simulation

Scheme Design

Industry-standard approach using an edge-coupled external light source combined with solid waveguides — a unified optical design that scales across 200G, 400G, 800G and 1.6T product families.

Single-source 1:4 and 1:8 fan-out designs, including FR-4 compatible options, to shorten development cycles and simplify integration.

Unique in-module coupling, locking mechanisms and high/low-temperature compensation algorithms that establish the foundation for high yield, low-cost mass productions.


Simulation Analysis

End-to-end simulation and analysis: full optical-path optical simulation, thermal simulation, signal-integrity (SI) simulation and 3D structural analysis.

Engineering platform supports the productization of all-silicon-photonics solutions from 200G through 1.6T.

79 granted patents specifically for silicon-photonic solutions.


Processing and Manufacturing

Fully self-developed coupling automation equipment and tri-temperature test stands, enabling flexible monthly capacity allocation and high production yields.


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Production Process

Tanlink Optics Automated unmanned workshop


Step 1 Optical Engine Desigh & Production.

The optical engine is seen as the core optical component in a transceiver. The optical engine’s packaging and production are mainly achieved in automated production area through using COB (Chip on Board) technology, which comprises 3 key process: die bonding, wire bonding and coupling .



Step 2 Transceiver Assembly

All finished optical components need to be packaged in the transceiver housing.  This step is often finished in the manual production area.


.Step 3 Testing

In the test area of Tanlink's factory, each transceiver must be tested to make sure whether it is in line with the corresponding standard.  Additionally, each one must be determined whether it can resist extreme environments and circumstances. 





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Reliability Test

Temperature & Humidity Cycling Test  

Temperature & humidity cycling test is used for examining the ability of 

Tanlink's transceiver products to resist extremely low and extremely high temperatures and humidities.


Vibration Test

Vibration test is for determining whether our transceiver products can withstand

 various environment vibrations by simulating possible vibration environments encountered

 by the product in the process of transportation, installation and use. 





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Performance testing

Performance testing 

involves in a ser- ies of metrics including eye diagrams,  receiving sensitivity,extinction ratios, 

signal-to-noiseratio, bit error rate and spectrum test, etc.



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Compatebility Test

Before delivery, each transceiver will be tested in a simulated OEM environment to make sure our transceivers are fully compatible with OEM systems.


Test Equipment such as:

  • MGMT AIS800-64O  MGMT AIS800-64D

  • Mellanox SN2700

  • CISCO N9K-C93180YC

  • Cisco C8111 N9K-C93180YC-EX 

  • ARISTA 7050Q-16  DCS-7050CX3-32S-F DCS-7060DX4-32S-F

  • Nvidia QM9790  SN5600  CX7  QM8700 Quantum-X800 Q3400-RA 900-9X81E-00EX-STO MCX75310AAS-NEA  MCX715105AS-WEAT

  • DELL Z9432-ON (400G QDD)

  • Juniper QFX5220-32CD

  • Nokia 7250 IXR-e

  • Keysight N5227B Vector Network Analyzer


Quality Certification
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