Direct Attach Cable BlueOptics UACC-DAC-QSFP28-2M, QSFP28 to QSFP28, 100GBASE-CR4, 30AWG, 2 m

BlueOptics UACC-DAC-QSFP28-2M is a 2 m passive direct attach cable with QSFP28 connectors designed for short-reach 100GBASE-CR4 links. Built with 30AWG conductors and compatible with Infiniband EDR signaling, this cable provides low-latency copper connectivity for server-to-switch, switch-to-switch and storage interconnects in rack and data centre environments.

Advantages

The cable offers a cost-efficient, low-power alternative to optical transceivers for short-distance 100 Gbps connections. Passive construction reduces power consumption and heat compared with active solutions, while QSFP28-to-QSFP28 terminations ensure plug-and-play compatibility with equipment that supports 100GBASE-CR4 or Infiniband EDR electrical interfaces. The 2 m length provides flexibility for cross-rack or within-rack deployments and the 30AWG conductor spec supports compact cable routing in dense installations.

Suitable for

• 100 Gbps server-to-switch links inside racks
• Switch-to-switch aggregation and leaf-spine connections at short distances
• High-performance storage interconnects within the same cabinet or adjacent racks
• Environments where low latency and low power consumption are required

When it may not be suitable

This passive DAC is intended for short-reach copper connections and is not suitable for long-distance links or fibre-only infrastructures. It requires QSFP28 ports that support 100GBASE-CR4 or compatible electrical signaling; it will not function where only optical transceivers or different form factors are supported. Environments that require extended reach, harsh environmental protection, or in-line signal boosting should use appropriate optical or active cabling alternatives.

Key specifications

• Connector type: QSFP28 to QSFP28
• Data rate: 100 Gbps (100GBASE-CR4)
• Length: 2 metres
• Conductor gauge: 30 AWG
• Cable type: Passive direct attach copper
• Signalling compatibility: Infiniband EDR electrical signalling compatible

How to use

Insert each QSFP28 connector into the corresponding port on network equipment while ensuring the link partner supports 100GBASE-CR4 electrical interface. Handle the cable by the connector bodies and avoid sharp bends or excessive pulling on the cable bundle; maintain the manufacturer’s minimum bend radius to preserve signal integrity. After seating both ends, verify link status on connected devices and monitor for expected data rates and error counters during initial operation.

What to consider before purchase

• Confirm that both ends of your equipment have QSFP28 ports and support 100GBASE-CR4 or equivalent electrical signalling.
• Verify required cable length—2 m is intended for within-rack or adjacent-rack connections.
• Check compatibility lists or vendor policies if your switch or server enforces vendor-locked cable checks.
• Consider environmental needs; passive DACs are for standard data centre conditions and not designed for outdoor or ruggedised use.

Usage recommendations

Use this BlueOptics QSFP28 DAC for short, high-bandwidth links where power efficiency and low latency are priorities. Route the cable to avoid tight bends, secure it within the rack to prevent strain, and validate link parameters after installation to ensure stable 100 Gbps operation.