BlueOptics QDD-400-CU1M-BL InfiniBand/fibre optic cable 1 m QSFP-DD Male/Male

The BlueOptics QDD-400-CU1M-BL InfiniBand/fibre optic cable 1 m QSFP-DD Male/Male is a 1-metre direct attach cable with QSFP-DD connectors designed for high-speed short-range interconnects. It implements a passive twinax copper design compliant with 400GBase-CR4 and the QSFP-DD multisource agreement (MSA) form factor to provide reliable electrical connectivity between compatible switches, routers, storage systems and compute nodes. The cable supports multi-protocol environments including Ethernet, Fibre Channel and InfiniBand at speeds up to 400 Gbps on short links where direct attach twinax is appropriate.

Advantages

The cable offers a compact, low-latency connection with low power consumption typical of passive direct attach twinax solutions. It is manufactured to industry MSA standards and uses high-quality components to achieve stable signal integrity and extended service life. As a short-range 1 m QSFP-DD male-to-male cable, it enables simple rack-to-rack or in-rack links without transceivers, reducing hardware complexity and total cost of ownership compared with optical modules for equivalent short distances.

Suitable for

• High-performance computing clusters and server interconnects
• Top-of-rack and adjacent-rack links in data centers
• Switch-to-switch, switch-to-router and switch-to-storage connections
• Environments requiring low-latency, high-bandwidth short-distance links

Key specifications

• Connector type: QSFP-DD male to QSFP-DD male
• Length: 1 metre
• Transmission standard: 400GBase-CR4 (passive twinax copper)
• Supported protocols: Ethernet, Fibre Channel, InfiniBand
• Cable gauge: 26 AWG twinax conductors
• MSA-compliant QSFP-DD form factor
• Designed for short-range direct attach applications with low latency and low power consumption

How to use

Ensure both devices support passive QSFP-DD direct attach twinax cables and the 400GBase-CR4 transmission mode before installation. Power down or follow hot-plug guidelines of your hardware if required by the vendor. Align each QSFP-DD connector with the corresponding port and insert firmly until the latch engages. Verify link status through the device management interface and confirm negotiated speed and protocol. For removal, release the latch and withdraw the connector straight out to avoid stressing the cable or port.

Recommendations

Use this 1 m QSFP-DD passive twinax cable for short-distance connections inside racks or between adjacent racks. Avoid tight bends and maintain the manufacturer’s minimum bend radius. Do not exceed the intended application distance and confirm compatibility with your hardware vendor’s supported cable types to ensure expected performance.