BlueOptics passive QSFP-DD to 4×QSFP56 400GBASE-CR4 to 4×100GBASE-CR Direct Attach Breakout Cable 2 m AWG26

BlueOptics passive QSFP-DD to 4×QSFP56 400GBASE-CR4 to 4×100GBASE-CR Direct Attach Breakout Cable 2 m AWG26 is a twinax copper breakout assembly that converts a single 400G QSFP-DD port into four independent 100G QSFP56 links. The cable is a passive, short-reach solution built with AWG26 conductors over a 2 meter length, intended for high-density server, switch and aggregation environments where splitting a 400G connection into multiple 100G links is required.

Advantages

The passive design provides low-latency, high-throughput copper connectivity without the need for additional transceivers or power, simplifying rack-level interconnects. The four-way breakout enables flexible port allocation and efficient use of high-speed switch fabrics. The 2 m length and AWG26 construction balance signal integrity and manageability for short-reach links between devices within a rack or across adjacent racks.

Suitable for

• Splitting a QSFP-DD 400G port into four 100G QSFP56 ports for server and switch interconnects
• Chip-to-chip and board-to-board short-reach connections inside data center racks
• Top-of-rack to aggregation switch links where short copper runs are acceptable
• High-density deployments requiring efficient use of limited port space

Key specifications

• Connector type: one QSFP-DD plug to four QSFP56 receptacles
• Supported link modes: 400GBASE-CR4 to four 100GBASE-CR links
• Cable type: passive twinax copper
• Conductor size: AWG26
• Length: 2 meters
• Use case: short-reach copper direct attach breakout

How to use

Install the QSFP-DD end into the 400G port on a compatible switch or device, and insert each QSFP56 connector into the target 100G ports on connected devices. Ensure that both ends are compatible with passive twinax breakout assemblies and that port firmware or switch configuration supports splitting a 400G port into four 100G lanes. Route the cable to avoid sharp bends and secure it to maintain proper bend radius and mechanical strain relief.

Usage recommendations

Use this passive breakout cable for short-reach, rack-level interconnects up to 2 m. Verify switch compatibility with 400G-to-4×100G breakouts and verify link settings after installation. Avoid exceeding the specified length and protect the cable from excessive bending, crushing, or electromagnetic interference sources for best performance.