BlueOptics QSFP-DD Direct Attach Cable 400GBASE-CR4 26 AWG Ethernet, 1 m (DDQ+DA0001-BL)

The BlueOptics QSFP-DD Direct Attach Cable 400GBASE-CR4 26 AWG Ethernet, 1 m is a passive direct-attach copper cable designed for short-reach, high-bandwidth interconnections in data centers. Built for QSFP-DD ports and 400GBASE-CR4 links, this 1-meter 26 AWG cable provides a compact, low-latency physical connection between high-density switches, routers and server NICs. The cable supports standard Ethernet signaling over QSFP-DD interfaces and is suitable for aggregation, spine-leaf fabrics and top-of-rack connectivity where distances are limited.

Advantages

This DAC offers reliable 400 Gbps connectivity with minimal power consumption and very low latency compared with optical transceivers. The 26 AWG copper construction provides a balance of flexibility and signal integrity for short-distance links. As a fixed-length direct attach solution, it eliminates the need for separate transceivers and patch cords, simplifying installation and reducing component count in high-density racks.

Suitable for

• Short-reach connections between switches and routers in data center racks
• High-throughput aggregation and spine-leaf network fabrics
• Low-latency server-to-switch links for compute clusters
• High-density port deployments with QSFP-DD interfaces

When it may not be suitable

This 1 m passive copper cable is intended for short-distance links; it is not suitable for extended runs between distant racks or across data halls where optical fiber or active copper solutions are required. Environments that require hot-pluggable transceiver flexibility or longer reach should consider fiber-optic modules or active optical cables instead.

Key specifications

• Interface type: QSFP-DD to QSFP-DD compatible connector
• Supported standard: 400GBASE-CR4 Ethernet signaling
• Cable construction: 26 AWG copper direct attach
• Length: 1 meter
• Application: Short-reach data center interconnects, high-density deployments

How to use

Install the cable by inserting each QSFP-DD connector into the corresponding port on the switch, router or server NIC until the latch engages. Confirm link status through device management interfaces and verify speed and lane mapping according to equipment documentation. No separate transceivers or patch panels are required; the cable functions as a single integrated assembly. For reliable operation, avoid tight bends near the connectors and secure cable routing to prevent strain on ports.

What to consider before purchase

• Confirm device compatibility with QSFP-DD 400GBASE-CR4 passive copper direct attach cables
• Ensure a 1 m length matches the intended rack or cabinet layout
• Verify port speed, lane configuration and firmware support on networking equipment
• Assess whether passive copper is acceptable for thermal and reach requirements

Usage recommendations

Use this BlueOptics QSFP-DD DAC for short, high-bandwidth links inside racks or between adjacent racks. Keep cable runs neat, avoid excessive bending radii, and check device compatibility lists to ensure full 400G operation. For runs beyond a few meters or when hot-swap transceiver flexibility is needed, consider optical alternatives.