DAC cable CBO QSFP28-DAC-1M 1m passive copper 100G for QSFP28 ports

Passive copper Direct Attach Cable (DAC) CBO QSFP28-DAC-1M is a 1 metre twinax cable engineered for 100G QSFP28 ports. The cable provides a direct electrical connection between compatible QSFP28 ports on switches, routers or network adapters, eliminating the need for separate optical transceivers for short-reach links. Designed for rack-to-rack and in-rack interconnects, it offers low latency and energy-efficient operation for high-density data centre and enterprise network environments.

Advantages

The passive copper construction delivers reliable 100G connectivity with minimal signal processing and low power consumption compared with active or optical solutions. Its fixed 1 metre length simplifies cabling in dense rack environments and reduces clutter. The twinax design provides low latency and consistent performance for short-reach links, while plug-and-play compatibility with standard QSFP28 ports allows fast deployment and straightforward maintenance.

Suitable for

• Short-reach 100G connections between adjacent racks or within the same rack
• Interconnects between switches, routers and network interface cards with QSFP28 ports
• High-density data centre environments requiring energy-efficient links
• Environments where low latency and predictable performance are required

Key specifications

• Connector type: QSFP28 to QSFP28 compatible twinax
• Length: 1 metre
• Cable type: Passive copper twinax
• Nominal data rate: 100 Gigabit per second
• Typical use: Short-reach direct attach between QSFP28 ports
• Latency: low, suitable for latency-sensitive applications
• Power: passive operation (no additional power required in the cable)

How to use

Ensure both devices have QSFP28 ports that support passive DAC connections. With devices powered down or following hot-plug guidance from your hardware vendor, insert each QSFP28 end of the twinax cable into the corresponding port until the latch engages. Verify link status in the device management interface and confirm the negotiated 100G link. For removal, disengage the latch before gently withdrawing the connector. Follow any vendor-specific compatibility lists and firmware recommendations to ensure full functionality.

Recommendations

Use this 1 metre passive DAC for short-distance, high-bandwidth links where cost-effectiveness and low power consumption are priorities. Avoid routing the cable near high-heat sources and maintain proper bend radius to preserve signal integrity. Check switch or adapter documentation for supported passive copper cables and firmware versions to ensure interoperability.