DAC cable CBO QSFP28-DAC-2M 2 m Passive QSFP28 direct-attach copper

The BlueOptics CBO QSFP28-DAC-2M 2 m Passive QSFP28 direct-attach copper is a 2‑metre direct-attach copper (DAC) cable with QSFP28 connectors, engineered for short-reach 100Gbps connections. It provides a low-latency, energy-efficient physical link between compatible QSFP28 ports in switches, routers and servers. The passive design eliminates active optics and power-hungry components, making it a cost-effective option for rack-to-rack and within-rack interconnects in data centres and high-density network environments.

Advantages

This passive QSFP28 DAC cable delivers reliable 100Gbps connectivity with minimal signal processing and reduced power consumption compared to active transceivers. Its fixed 2 m length simplifies rack planning and minimises excess cabling. The cable uses QSFP28 form-factor connectors to ensure mechanical compatibility with standard 100Gbps QSFP28 ports and supports low-latency transmission suitable for latency-sensitive applications. The all-copper construction provides straightforward installation and maintenance without the need for optical modules or additional power.

Suitable for

• Short-reach 100Gbps links between switches and routers within the same rack or adjacent racks
• Server-to-switch and server-to-router connections in data centre topologies
• High-density switch interconnects in spine-leaf architectures
• Environments where low latency and reduced power consumption are required

Key specifications

• Connector type: QSFP28 to QSFP28
• Data rate: 100 Gbps
• Length: 2 m (fixed)
• Cable type: Passive direct-attach copper (DAC)
• Typical use: Short-reach, within-rack and rack-to-rack interconnects
• Latency: Low-latency physical link suitable for time-sensitive traffic

How to use

Install the cable by inserting each QSFP28 connector into the corresponding QSFP28 port until it latches. Ensure both network devices are powered down or in a state recommended by the device manufacturer for hot-plugging; consult device documentation for hot-swap guidance. After seating the connectors, verify link status in the device management interface and confirm that the ports negotiate 100Gbps operation. Route the cable to avoid sharp bends and mechanical strain; secure it where necessary to maintain airflow and cabling order in the rack.

Recommendations

Use this 2 m passive QSFP28 DAC for short-distance interconnects within racks or between adjacent racks. Avoid operating in environments with excessive electromagnetic interference or where cable bending radius or mechanical stress may be exceeded. For longer distances or environments requiring electrical isolation, consider optical transceivers and fiber cabling.