Direct Attach Copper (DAC) Cable CBO QSFP28-DAC-5M 5m Passive 40Gbps QSFP28

CBO QSFP28-DAC-5M is a 5 metre passive Direct Attach Copper (DAC) cable with QSFP28 connectors, engineered for 40Gbps short-reach interconnects. It provides a low-latency, point-to-point copper link suitable for connecting QSFP28 ports in switches, routers and servers. The cable is intended for data centre rack-to-rack or within-rack connections where a compact, cost-effective and reliable copper solution is required.

Advantages

The passive DAC design delivers low power consumption and minimal signal processing, resulting in low latency and predictable performance. Using QSFP28 connectors ensures compatibility with standard 40Gbps QSFP28 ports while keeping a compact cable profile that simplifies cabling in dense racks. The 5 m length balances flexibility and clean cable management for short to medium interconnect spans without the need for optical transceivers.

Suitable for

• Short-reach connections between switches in the same rack or adjacent racks
• Direct server-to-switch links requiring 40Gbps bandwidth
• High-density rack installations where compact cabling is needed
• Cost-sensitive deployments that favour passive copper over active optics

Key specifications

• Connector type: QSFP28 to QSFP28
• Maximum data rate: 40 Gbps (aggregate)
• Cable type: Passive Direct Attach Copper (DAC)
• Length: 5 metres
• Typical applications: short-reach interconnects for data centres and enterprise networks
• Physical: compact round cable suitable for dense rack routing

How to use

Install the QSFP28-DAC-5M by aligning each QSFP28 connector with the corresponding port on your switch, router or server and firmly inserting until the latch engages. No optical transceivers or additional power sources are required. When removing the cable, release the connector latch and withdraw straight out to avoid damaging the port. Ensure system firmware and port settings support 40Gbps DAC connections and verify link status via device management interfaces after insertion.

Recommendations

For optimal performance, use the cable within its specified 5 m length and avoid tight bends or kinks; maintain bend radii recommended by equipment vendors. Reserve DAC cabling for short-distance links inside racks or between adjacent racks, and consider active or optical solutions for longer runs or when electrical isolation is required. Verify compatibility with your network equipment and, when possible, update device firmware to the latest stable version before deployment.