DAC cable BlueOptics DAC-Q56DD-400G-2M-BL 2m QSFP-DD Male/Male

The BlueOptics DAC-Q56DD-400G-2M-BL is a 2 m direct attach copper (DAC) cable with QSFP-DD male-to-male connectors designed for short-reach, high-bandwidth interconnects in data center and enterprise networking environments. This cable supports high-speed links up to 400 Gbps and is built for low-latency, energy-efficient connections between switches, routers, servers and network interface cards that accept QSFP-DD modules.

Advantages

The cable provides a cost-effective, low-power alternative to active optical modules for short distances, delivering reliable 400 Gbps throughput with minimal signal loss. Its QSFP-DD male connectors ensure compatibility with a wide range of QSFP-DD ports and the fixed 2 m length simplifies cabling planning in rack-to-rack or top-of-rack installations. The passive/active DAC construction reduces heat generation and eliminates the need for separate transceivers, helping to lower total system power consumption.

Suitable for

• High-bandwidth switch-to-switch interconnects in data centers
• Server-to-top-of-rack switch connections
• Short-reach links inside wiring closets and equipment racks
• Environments requiring low-latency, high-throughput connections

Key specifications

• Connector type: QSFP-DD male to QSFP-DD male
• Cable type: Direct attach copper (DAC)
• Maximum data rate: 400 Gbps
• Length: 2 m
• Typical use: Short-reach rack and cabinet interconnects
• Latency: Low, suitable for high-performance networking

How to use

Install the DAC cable by inserting each QSFP-DD male connector firmly into the corresponding QSFP-DD port on the network devices until the latch engages. Ensure devices are powered off or that hot-plug support is enabled as per the equipment manufacturer's guidance. Verify link status in the devices' management interfaces and confirm the negotiated 400 Gbps link if supported by both ports. Route the cable to avoid sharp bends and mechanical strain, maintaining the specified minimum bend radius to prevent damage.

Recommendations

Use this 2 m QSFP-DD DAC cable for short-distance, high-speed interconnects where optical transceivers are not required. Check compatibility with your switch or server vendor for QSFP-DD passive/active DAC support and adhere to rack cable management best practices to ensure airflow and prevent connector stress.