Unlocking Performance with 400G QSFP-DD DAC Cables: High-Speed Connectivity by QSFPDD800G, a Taiwan TAA Manufacturer

Unlocking Performance with 400G QSFP-DD DAC Cables: High-Speed Connectivity by QSFPDD800G, a Taiwan TAA Manufacturer

OptechTW

400G QSFP-DD DAC Cable: High-Speed, Low-Latency Data Center Connectivity

What Is a 400G QSFP-DD DAC Cable?

A 400G QSFP-DD (Quad Small Form-factor Pluggable Double Density) Direct Attach Copper (DAC) cable is a cost-effective, low-power interconnect solution designed for short-range, high-bandwidth data center applications. Using eight lanes of 50G PAM4 signaling, it supports up to 400Gbps over passive copper cables without the need for optical transceivers or external power.

Advantages of 400G QSFP-DD DAC Cables

✅ Ultra-Low Latency

Ideal for latency-sensitive environments like high-frequency trading, AI computing, and real-time data processing.

✅ Cost-Efficiency

Eliminates the need for optical modules and fibers, significantly reducing CAPEX for top-of-rack (ToR) and switch-to-server connectivity.

✅ Low Power Consumption

With no need for electrical-to-optical conversion, passive DACs use less than 0.1W per end—perfect for green data centers.

✅ High Reliability

Simplified architecture means fewer points of failure and improved mechanical stability over short distances (typically <2m or 3m).

Common Use Cases and Application Scenarios

Use Case Description
ToR Switch to Server Ideal for connecting 400G switches to high-performance computing nodes.
Intra-Rack Cabling Used within racks to link GPUs, storage, and CPUs in tightly integrated systems.
AI and HPC Clusters Enables GPU-GPU low-latency communication, especially in NVIDIA-based clusters.
Interconnect for HFT Ultra-low-latency interconnects for high-frequency trading platforms.

Compatibility and Standards

The 400G QSFP-DD DAC cable is compliant with IEEE 802.3cd, QSFP-DD MSA, and SFF-8679 electrical interfaces. QSFPDD800G, a trusted Taiwan TAA-compliant manufacturer, ensures full compatibility with switches from Cisco, Arista, Juniper, NVIDIA (Spectrum series), and Broadcom-based NICs.

About QSFPDD800G – A Taiwan TAA Manufacturer

QSFPDD800G specializes in developing and manufacturing high-performance interconnect solutions, including DAC, AOC, and optical transceivers for data centers and telecom networks. As a Taiwan-based TAA-compliant supplier, we ensure:

  • Full regulatory compliance

  • Competitive pricing for government and enterprise procurement

  • Unmatched quality and testing standards

  • Compatibility with all major switch and server brands

Conclusion

400G QSFP-DD DAC cables deliver unmatched performance, reliability, and cost-efficiency for short-range data center interconnects. Whether you're scaling AI compute clusters or upgrading your ToR infrastructure, QSFPDD800G's TAA-certified DAC cables offer a trusted solution tailored to next-gen networking.

Need Custom Length or Labeling?

QSFPDD800G offers custom DAC assembly, private labeling, and OEM solutions to fit your exact system architecture. Contact us for a quote today.

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