DAC cable CBO AT-QSFP28-3CU 3 m passive QSFP28 to QSFP28

Passive DAC (Direct Attach Copper) cable BlueOptics AT-QSFP28-3CU is a 3 m twin-axial copper interconnect with QSFP28 connectors on both ends. Designed for short-reach, high-bandwidth links in racks and data center top-of-rack deployments, this cable supports QSFP28 ports to enable 100Gbps-class connections with low latency and predictable electrical performance. The all-in-one cable assembly removes the need for separate transceivers for direct server, switch and storage interconnection where copper connectivity is appropriate.

Advantages

This 3 m passive QSFP28 to QSFP28 cable delivers low power consumption compared with active solutions and eliminates the need for SFP/QSFP transceivers, reducing overall hardware cost and complexity. Its twin-ax copper construction maintains signal integrity across the short link and provides reliable, deterministic performance for latency-sensitive applications. The pre-terminated QSFP28 plugs simplify installation and reduce rack cabling clutter.

Suitable for

• Top-of-rack switch-to-switch or switch-to-server links
• Direct attach connections between servers and storage systems within the same rack
• Short-reach connections in data centers and network closets

Key specifications

• Cable type: passive twin-axial copper
• Connector type: QSFP28 to QSFP28
• Length: 3 m
• Supported data rate: up to 100 Gbps aggregate (QSFP28 standard)
• Typical use: short-reach, rack-level interconnects
• Form factor: pre-terminated cable assembly with integrated plugs

How to use

Verify both equipment ports support passive QSFP28 DAC cables and are configured for the same data rate and lane mapping. Align the QSFP28 connector keying with the port, insert the plug straight into the QSFP28 cage until it seats, and secure any latch mechanism if present. For cable removal, release the latch and pull the cable straight out to avoid damaging the connector or port. Use the cable within rack and enclosure pathways that do not exceed the specified length and avoid tight bends that could stress the cable assembly.

Recommendations

Use this passive QSFP28 to QSFP28 DAC in short-distance scenarios where 3 m copper connectivity provides sufficient performance and lower cost compared with fiber or active optical solutions. Avoid deploying this cable in environments requiring longer reach or where electromagnetic interference may affect copper links; in such cases choose appropriate active or fiber options.