Direct Attach Breakout Cable BlueOptics QDD-4X100G-2M, QSFP-DD to 4×QSFP56, 400GBASE-CR4 to 4×100GBASE-CR, 2 m, AWG26

BlueOptics QDD-4X100G-2M is a passive direct attach breakout cable that converts a single QSFP-DD 400GBASE-CR4 interface into four separate QSFP56 100GBASE-CR links. The cable is a 2 meter assembly using AWG26 copper, designed for short-reach electrical connections in high-density networking environments. It provides a compact, low-latency solution for interconnecting switches, routers and servers where Quad 100G channels are required.

Advantages

The passive QSFP-DD to 4×QSFP56 breakout design offers simple, cable-based electrical segregation of 400G into four 100G lanes without the need for active modules or external power. The AWG26 copper conductors deliver predictable signal integrity for short-distance links while keeping cost and power consumption low. The 2 m length balances reach and manageability for rack and row cabling, and the form factor supports high-density installations with minimal port fan-out complexity.

Suitable for

• Top-of-rack aggregation between leaf and spine switches
• Spine-to-leaf links in data centre fabric
• In-rack switch-to-server or switch-to-switch connectivity
• High-density switch deployments requiring Quad 100G channels

Key specifications

• Connector type: QSFP-DD (single end) to 4 × QSFP56 (breakout ends)
• Cable type: Passive copper direct attach breakout
• Data rates supported: 400GBASE-CR4 to 4 × 100GBASE-CR
• Length: 2 meters
• Conductor gauge: AWG26
• Reach: short-reach electrical interconnect for rack and adjacent rack connections
• Latency: low, passive electrical path

How to use

Insert the QSFP-DD end into the 400G port on the originating switch, router or server and plug each QSFP56 breakout connector into the corresponding 100G ports on target devices. Ensure both ends are correctly seated and that connected devices support passive direct-attach breakout connections and the corresponding link speeds. Route the cable to avoid sharp bends and excessive tension; the assembly is intended for short-distance patching within racks or between adjacent racks.

Usage recommendations

Verify compatibility with device firmware and port settings before deployment. Use this passive breakout cable where short-reach, low-latency and cost-effective 400G-to-4×100G split is required. Avoid exposure to high electromagnetic interference environments and maintain bend radius guidelines to preserve signal integrity.