BlueOptics QSFP-H40G-CU4M-BL InfiniBand/fibre optic cable 5 m Black

The BlueOptics QSFP-H40G-CU4M-BL is a 5 m passive Direct Attach Cable (DAC) with QSFP-to-QSFP connectors designed for short-range, high-speed interconnects. It provides a 40GBase-CR4 electrical connection using twinax copper construction and is suitable for InfiniBand and Ethernet environments that accept QSFP 40G DAC modules. The cable is black, 5 meters in length and intended for rack-to-rack or within-rack links where low latency and low power consumption are required.

Advantages

This 40G twinax DAC offers a straightforward plug-and-play solution with QSFP connectors on both ends, enabling fast installation in compatible networking and storage equipment. As a passive cable, it requires no external power and has low latency and low power draw. The cable follows MSA-compliant QSFP form-factor guidelines and is manufactured using components and construction methods that target reliable long-term operation in data center environments.

Suitable for

• Short-range links between switches and routers within or between adjacent racks
• Server-to-switch and storage-to-switch connections in data centres
• InfiniBand and 40G Ethernet (40GBase-CR4) interconnects

Key specifications

• Interface: QSFP-to-QSFP connectors
• Nominal speed: up to 40 Gbps aggregate
• Medium: passive twinax copper (DAC)
• Length: 5 metres
• Wire gauge: 30 AWG twinax conductor
• Colour: black
• Form-factor compliance: QSFP MSA compatible

How to use

Install the cable by inserting each QSFP connector into the corresponding QSFP port on the devices to be linked, ensuring both ends seat fully and the latch engages. Use this passive DAC for short-distance links where the connected hardware supports passive 40G QSFP twinax cables. Verify link status in device management interfaces after physical installation and confirm that the host systems are configured for the intended 40GBase-CR4 or InfiniBand protocol.

Recommendations

For reliable operation, avoid tight bends and excessive mechanical stress on the cable, maintain proper airflow in the rack, and ensure the connected devices officially support passive QSFP 40G DACs. Use within the specified short-range environment; for longer distances consider active DACs or optical transceivers with fiber cabling.