CBO DAC cable Q28-4S28-DAC-3M 3m QSFP28 compatible direct-attach copper cable

The CBO DAC cable Q28-4S28-DAC-3M is a 3-meter Direct-Attach Copper (DAC) cable compatible with QSFP28 ports, engineered for short-reach, high-speed interconnects. It supports native QSFP28 interfaces and 100 Gigabit Ethernet links, providing a low-latency, single-cable solution for connecting servers, switches and storage devices in dense networking environments. The fixed-length copper assembly simplifies cabling management where fiber transceivers are unnecessary and offers a predictable electrical connection for top-of-rack and rack-to-rack installations.

Advantages

This QSFP28 compatible DAC cable delivers low latency and high throughput for 100GbE applications while eliminating the need for separate transceivers. The 3 m length balances reach and signal integrity for short data center links, and the direct-attach design reduces power consumption compared with optical alternatives. The cable is suitable for high-density racks, allowing tidy routing and straightforward replacement with identical fixed-length assemblies.

Suitable for

• Top-of-rack (ToR) switch to server connections
• Rack-to-rack high-speed links within the same equipment room
• Patch panels and short interconnects in data centers
• Low-latency connections between storage arrays and compute nodes

Key specifications

• Connector type: QSFP28 compatible direct-attach copper
• Cable length: 3 meters
• Supported data rate: 100 Gigabit Ethernet (100GbE) / native QSFP28
• Transmission medium: twinax copper cable (direct-attach)
• Latency: low, suitable for short-reach, high-performance links
• Power profile: lower power consumption compared with optical transceiver plus fiber

How to use

Insert each QSFP28-compatible connector into the corresponding port on network devices until it latches securely. Ensure both ends are fully seated and that link LEDs on the devices indicate an active connection. Route the 3 m cable to avoid sharp bends and mechanical strain; maintain recommended bend radius to preserve signal integrity. For best results, verify compatibility with the equipment vendor's QSFP28 ports and configure network interfaces according to standard 100GbE settings.

Recommendations

Use this fixed-length DAC cable for short, high-speed links where fiber optics are unnecessary. Keep the cable within the same rack or adjacent racks to maintain signal quality. Avoid exposure to excessive heat sources and prevent repeated flexing at connector ends to extend service life.