Direct Attach Copper (DAC) Cable CBO QSFP28 to 4×SFP28 3m Length

Direct Attach Copper (DAC) Cable CBO QSFP28 to 4×SFP28 3m Length is a passive copper interconnect designed to link a single QSFP28 port to four SFP28 ports. The 3-meter fixed assembly delivers a compact, low-latency physical connection for short-reach data center and enterprise networking environments. As a pre-terminated cable, it reduces the need for separate transceivers and simplifies rack cabling while supporting high-density server, switch and storage interconnects.

Advantages

The DAC assembly offers predictable electrical performance and minimal latency compared with optical modules for short distances. Its passive copper construction eliminates the need for power at the cable ends, which helps reduce heat and power consumption in densely populated racks. The fixed, pre-terminated form factor streamlines installation and inventory management by removing separate transceiver purchases and reducing spare parts complexity.

Suitable for

• High-density rack-to-rack or within-rack connections in data centers
• Server to top-of-rack switch uplinks using QSFP28 and SFP28 ports
• Storage array interconnects where low latency is required
• Short-reach links in enterprise core and aggregation layers

Key specifications

• Cable type: Passive direct attach copper
• Connector configuration: QSFP28 to four SFP28 connectors
• Length: 3 meters
• Applications: Short-reach, high-density interconnects for servers, switches and storage
• Latency: Low, suitable for latency-sensitive traffic
• Form factor: Fixed, pre-terminated assembly for simplified cabling

How to use

Connect the QSFP28 plug to the host device QSFP28 port and insert each SFP28 plug into the corresponding SFP28 ports on the remote equipment. Ensure that both ends are aligned and fully seated until the connector latches engage. Use cable routing management to avoid sharp bends and to maintain recommended bend radius for copper assemblies. No additional module configuration is required beyond standard port enablement and network configuration on the connected devices.

Recommendations

For reliable operation, use this DAC cable in distances up to 3 meters in typical data center environments and avoid routing near high EMI sources. Maintain proper airflow and avoid placing the cable under compression. Verify compatibility with device vendor port specifications and supported link speeds (e.g., 25/100 Gbps modes where applicable) before deployment.