Network Cable HP Enterprise X240 40G QSFP+/QSFP+ 5M — 40Gbps Active Direct Attach

HP Enterprise X240 40G QSFP+/QSFP+ 5M is an active direct attach cable designed to provide 40Gbps connectivity between QSFP+ ports. With a 5-metre cable length and support for 40GbE links, this DAC offers a low-latency, high-bandwidth physical connection suitable for short-reach interconnects in data centers, server racks and enterprise networking equipment. The cable is intended for direct QSFP+ to QSFP+ connections between switches, routers and servers where a reliable 40Gbps link is required.

Advantages

The active design reduces signal loss over the 5 m distance and supports stable 40 Gbps throughput while maintaining low latency. Using a direct attach cable simplifies cabling infrastructure by eliminating separate transceivers and reducing power consumption compared with optical alternatives. Its compatibility with QSFP+ ports makes it a practical choice for densely cabled rack environments where consistent high-speed links are needed.

Suitable for

• Short-reach interconnects between QSFP+ ports in data center racks
• High-bandwidth uplinks between switches and aggregation devices
• Direct server-to-switch 40GbE connections for compute and storage nodes
• Environments requiring low-latency, high-throughput links over a few metres

When it may not be suitable

This 5 m active DAC is not intended for long-distance runs or campus-level links where fibre optics are required. It is limited to devices with compatible QSFP+ ports; it will not work with equipment that uses different form factors or requires separate transceivers. For environments that demand flexible port breakout, conversion to different speeds or longer reach beyond a few metres, alternative optical cabling or transceiver-based solutions should be considered.

Key specifications

• Rated data rate: 40 Gbps
• Connector type: QSFP+ to QSFP+
• Length: 5 metres
• Design: Active direct attach cable (active DAC)
• Typical use: Short-reach, high-bandwidth interconnects

How to use

Install by seating each QSFP+ connector into the corresponding port on the devices to be linked, ensuring the latch or retention mechanism clicks into place. Verify that both devices support 40GbE over QSFP+ and check port configuration in the network equipment management interface. No separate transceivers are required; the cable provides the physical link directly. After connection, confirm link status and speed on both ends and adjust device settings if auto-negotiation or link training is necessary.

What to consider before purchase

• Confirm both endpoints have compatible QSFP+ ports that support 40GbE over active DACs
• Verify 5 m length is suitable for rack layout and cable management
• Ensure device firmware and drivers support the cable vendor compatibility policies
• Determine whether active DAC performance and power characteristics meet your thermal and power budgets

Usage recommendations

Use the cable for short, high-bandwidth links inside racks or between adjacent racks. Route the cable to avoid sharp bends and secure it to maintain airflow and reduce strain on connectors. Monitor link status after installation and keep device firmware up to date to ensure interoperability.