BlueOptics compatible QSFP+ Direct Attach Cable 40GBASE-CR4, Ethernet/Infiniband QDR, 30AWG, 3 m

BlueOptics compatible QSFP+ Direct Attach Cable 40GBASE-CR4, 3 m is a passive twinax copper assembly designed for short-reach 40 Gbps interconnects. The cable uses QSFP+ connectors and 30AWG conductors to support 40GBASE-CR4 links for Ethernet and InfiniBand QDR environments. With a 3-meter length it is intended for server-to-switch, switch-to-switch and high-performance computing interconnects that require low-latency and high-bandwidth copper connections.

Advantages

The cable provides a cost-effective, low-power option for establishing 40 Gbps links without the need for transceivers. Its passive twinax construction delivers consistent signal integrity for short distances while keeping power consumption and heat generation minimal. Compatibility with standard QSFP+ ports makes installation straightforward and interoperable with equipment that supports 40GBASE-CR4 and InfiniBand QDR electrical interfaces.

Suitable for

• Server-to-switch connections in data center racks
• Switch-to-switch links within the same rack or adjacent racks
• High-performance computing (HPC) node interconnects using InfiniBand QDR
• Short-reach aggregation and top-of-rack (ToR) deployments requiring 40 Gbps

When it may not be suitable

This passive QSFP+ Direct Attach Cable is designed for short-reach links and is not suitable for long-distance runs or campus backbone connections; optical fiber transceivers or active optical cables should be used for greater distances. It is also not intended for use where electrical isolation or extended EMI immunity provided by optical solutions is required.

Key specifications

• Data rate: 40 Gbps (4 lanes aggregated)
• Standard: 40GBASE-CR4 compatible
• Connector type: QSFP+ to QSFP+
• Cable conductor: 30AWG twinax copper
• Length: 3 m
• Supported protocols: Ethernet (40G) and InfiniBand QDR
• Passive (no active electronics or power required)

How to use

Insert each QSFP+ connector into the appropriate QSFP+ port on the networking devices until the connector latches. Confirm link status on both devices and verify the negotiated speed is 40 Gbps. For best performance keep cable runs within the specified 3 m length and avoid sharp bends or excessive pull force. Regularly inspect connectors for dust or debris and clean with appropriate tools before insertion if necessary.

What to consider before purchase

• Confirm that both devices have QSFP+ ports that support 40GBASE-CR4 or InfiniBand QDR electrical interfaces
• Verify that a 3 m passive twinax cable meets your rack layout and distance requirements
• Check interoperability requirements with your switch or server vendor documentation
• Consider whether an active optical cable or fiber transceivers are required for longer distances or optical isolation

Usage recommendations

Use this BlueOptics compatible QSFP+ Direct Attach Cable for short, high-bandwidth links inside racks or between adjacent racks. Ensure correct port compatibility and handle connectors gently to maintain signal quality and connector life.