DAC passive cable CBO QSFP-4SFP+ 1 m — QSFP to 4 × SFP+ direct-attach

Passive DAC cable CBO QSFP-4SFP+ 1 m is a direct-attach copper assembly that breaks out one QSFP port to four independent SFP+ ports over a 1 metre fixed length. It is intended for short-reach interconnects in data centres and server racks where a compact, low-latency, and cost-effective copper connection is required. The cable operates without transceivers or separate power and provides a stable electrical interface between QSFP-enabled switches or modules and SFP+-based devices.

Advantages

This QSFP-to-4×SFP+ passive DAC offers reduced latency and deterministic performance compared with fibre solutions that require optical transceivers. The one-metre length minimises clutter in high-density rack environments and simplifies cable management for top-of-rack and end-of-row deployments. As a passive direct-attach solution it eliminates the need for separate optics, lowering both initial hardware cost and ongoing spare-part complexity while providing reliable, low-power interconnects for short-distance links.

Suitable for

• Switch-to-switch interconnects inside racks
• Switch-to-server connections where QSFP breakout is required
• High-density top-of-rack deployments
• Short-reach links in data centre aggregation and spine-leaf topologies

Key specifications

• Connector type: QSFP (one end) to 4 × SFP+ (other end)
• Length: 1 metre fixed
• Media: Passive copper direct-attach assembly
• Use case: Short-reach electrical breakout for 10 G/40 G class ports
• Form factor: Breakout cable with integrated connectors, compact profile for high-density racks

How to use

Install the QSFP end into the QSFP port of the source switch or transceiver slot and plug the four SFP+ connectors into the destination SFP+ ports. Ensure both ends are fully seated and the host devices are powered off or follow live-insertion guidelines of the equipment manufacturer if supported. Verify link lights and device port status in the switch or server management interface after insertion. No additional configuration is required by the cable itself; port configuration should match the intended link speed and breakout mode as supported by the networking hardware.

Usage recommendations

Use this passive DAC for short-distance connections within the same rack or adjacent racks; avoid runs beyond the specified 1 m length. Confirm that your network equipment supports passive QSFP-to-SFP+ breakout and that firmware settings allow the intended port breakout mode. Keep the cable free from sharp bends and secure it to avoid strain on the connectors.