InfiniBand/fibre optic cable BlueOptics DEM-CB050QXS-BL 0.5 m QSFP Male/Male

The BlueOptics DEM-CB050QXS-BL is a 0.5 m InfiniBand/fibre optic direct attach cable with QSFP male-to-male connectors, intended for short-range high-speed links in data centers and networking racks. It supports 40GBase-CR4/40 Gbps applications over a 0.5 m twinax copper connection and is MSA-compliant for use with equipment that accepts QSFP direct attach cables. The cable is designed for low latency, low power consumption and straightforward rack-to-rack or intra-rack connectivity where reliable electrical signal transmission over short distances is required.

Advantages

The cable provides a compact, single-segment connection with QSFP-to-QSFP compatibility enabling 40 Gbps throughput on short runs. As a passive direct attach twinax cable it requires no additional power for signal conversion, resulting in minimal power draw and reduced heat compared with active optical transceivers. The MSA-compliant design and use of high-quality components ensures functional compatibility with major switch, router and storage platforms that support QSFP passive DACs, while the 0.5 m length simplifies tidy rack installations and reduces signal attenuation typical for longer runs.

Suitable for

• Connecting QSFP ports between switches within the same rack or adjacent racks
• High-density server-to-switch links in data center topologies
• Storage area network interconnects requiring 40 Gbps short-reach links
• InfiniBand and Ethernet environments supporting 40GBase-CR4

Key specifications

• Connector type: QSFP male-to-male
• Length: 0.5 meter
• Data rate: up to 40 Gbps
• Cable type: passive twinax copper (direct attach)
• Wire gauge: 30 AWG
• Standards compliance: MSA-compliant for QSFP direct attach applications
• Typical applications: Ethernet, FCoE, Fibre Channel, InfiniBand short-reach links

How to use

Verify that the network equipment supports passive QSFP direct attach twinax cables and that the QSFP ports are enabled for 40G operation. With both devices powered down or under appropriate hot-plug guidelines from the hardware vendor, align and insert the QSFP plugs into the corresponding QSFP ports until they seat firmly. Confirm link status and negotiate speed through the equipment management interface. Use the cable for short-distance interconnects; do not extend beyond the recommended 0.5 m length for guaranteed 40G performance.

Usage recommendations

To maintain signal integrity and longevity, avoid tight bends and excessive strain on the cable and keep it clear of sharp edges or high-temperature sources. Use the 0.5 m passive twinax cable for direct rack or adjacent-rack connections and select active transceivers or longer-length certified optical cables for greater distances.