DAC cable CBO QSFP28-DAC-2M 2 m passive copper for QSFP28 ports

Passive copper DAC cable CBO QSFP28-DAC-2M is a 2 metre direct attach cable engineered for QSFP28-to-QSFP28 ports. Designed for short-reach high-speed connectivity, this DAC cable provides a simple, low-latency electrical link between switches, routers or server adapters supporting QSFP28 interfaces. The cable supports typical 40/100 Gbps server and switch port configurations depending on connected equipment and is intended for rack-to-rack and intra-rack installations where active optical transceivers are not required.

Advantages

The passive construction delivers lower power consumption and reduced heat compared with active modules, while keeping acquisition and operational costs low. Its fixed 2 m length simplifies cable management in dense racks and telecom enclosures. The cable offers predictable signal integrity for short distances and eliminates the need for separate transceivers, which reduces component count and simplifies deployment and inventory tracking.

Suitable for

• Short-reach connections between QSFP28 ports in the same rack
• Rack-to-rack links in data centre rows and cabinets
• Interconnects between switches, routers and server NICs with QSFP28 interfaces
• High-density patching environments where low latency is required

Key specifications

• Connector type: QSFP28 to QSFP28 compatible
• Cable type: Passive twinax copper direct attach
• Length: 2 metres
• Supported data rates: up to 40/100 Gbps depending on equipment
• Application: short-reach, intra-rack and rack-to-rack network links
• Power use: passive (no external power required)

How to use

Insert each QSFP28 connector firmly into the corresponding port until the latch engages. Ensure both endpoints support the intended data rate (40 Gbps or 100 Gbps) and confirm the port configuration in your switch or host adapter before traffic is applied. Route the cable to avoid sharp bends and mechanical strain; maintain bend radii recommended by the equipment vendor. For best results, verify link status and speeds in the device management interface after installation.

Recommendations

Use this 2 m passive DAC for short-distance links inside racks and between adjacent racks. Avoid using passive copper DACs for longer distances or in environments where electrical interference is a concern. For deployments requiring optical isolation, longer reach, or fibre backbone integration, consider active optical solutions or fibre transceivers instead.