400G QSFP-DD to 4x100G QSFP56 Passive Copper Breakout Cable: 400G-PDAC-QSFP-DD-4xQSFP56

The EDGEOPTIC 400G-PDAC-QSFP-DD-4xQSFP56 is a high-performance passive direct attach copper (DAC) breakout cable designed to split a single 400G QSFP-DD port into four independent QSFP56 connections. This makes it an efficient and cost-effective solution for connecting high-speed switches to multiple 100G endpoints in modern data center environments. With a QSFP-DD connector on one end and four QSFP56 connectors on the other, it enables flexible point-to-point fan-out connectivity for spine-leaf architectures, server aggregation, and AI/ML cluster deployments.

The cable supports aggregate data rates from 106.25 up to 425 Gbps, delivering 4 × 100G Ethernet links from a single 400G port. It is fully compatible with 100G, 200G, and 400G Ethernet environments, providing flexibility for mixed-speed deployments and gradual infrastructure upgrades. In InfiniBand environments, it supports HDR, making it suitable for high-performance computing, GPU clusters, and data-intensive workloads that require fast, stable interconnects.

As a passive DAC solution, the cable requires no external power and introduces virtually zero latency, ensuring efficient and reliable data transmission. It is constructed using high-quality twinax copper with an optimized AWG28 design, maintaining strong signal integrity across all four channels while remaining flexible enough for high-density installations.

The cable supports DDM/DOM functionality, allowing real-time monitoring of key parameters such as temperature and voltage. This helps simplify network management and improves reliability through proactive diagnostics.

Designed to meet QSFP-DD MSA, QSFP56 MSA, and SFF-8636 standards, along with IEEE 802.3cd, IEEE 802.3bj, and InfiniBand HDR specifications, the cable ensures broad interoperability with a wide range of networking equipment. It operates within a standard temperature range of 0 to 70°C and offers an MTBF of 1,000,000 hours, supporting long-term, dependable performance in mission-critical environments.

Typical applications include breaking out 400G switch ports into multiple 100G links for server connectivity, linking top-of-rack switches to aggregation layers, and enabling scalable GPU cluster networking for AI and machine learning workloads. Its passive, power-efficient design also contributes to reduced energy consumption in large-scale data centers.

Each cable undergoes comprehensive testing before shipment, including electrical performance validation and connector inspection, to ensure consistent quality and reliability. It is CE and RoHS certified, meeting international safety and environmental standards.