BlueOptics QSFP Direct Attach Cable 40GBASE-CR4, 3 m

BlueOptics QSFP Direct Attach Cable 40GBASE-CR4, 3 m is a passive copper direct-attach cable designed for short-reach 40 Gbps connections between devices with QSFP ports. The 3-meter cable supports 40GBASE-CR4 electrical signaling to provide a cost-effective, low-latency interconnect for switches, servers and other network equipment in data centres and campus networks. The assembly integrates a QSFP connector at each end and is suitable for use where optical transceivers are not required or where copper DACs provide sufficient reach and performance.

Advantages

The cable delivers aggregated 40 Gbps throughput with minimal power consumption because it is a passive copper solution. It provides predictable latency and stable performance for short-range links, simplifies deployment with plug-and-play QSFP connectors, and reduces total cost of ownership compared with transceiver-plus-fibre cabling for equivalent short-distance connections.

Suitable for

• Inter-rack and intra-rack connections between QSFP-enabled switches and routers
• Server to top-of-rack switch links in data centres
• Short-range uplink aggregation and high-throughput links in campus networks
• Environments where low latency and minimal power usage are required

Key specifications

• Form factor: QSFP direct attach cable (DAC)
• Data rate: 40 Gbps (4 lanes, 10 Gbps per lane)
• Standard: 40GBASE-CR4 electrical signalling
• Cable length: 3 m
• Connector type: QSFP to QSFP
• Cable medium: Passive copper
• Typical use: Short-reach, low-latency interconnects

How to use

Insert each QSFP connector into the corresponding QSFP port on the network devices until the retention latch engages. Ensure both ends are fully seated and that the connected devices are powered and configured for 40G operation on the ports. No additional configuration is typically required on devices that recognise passive QSFP DACs; verify link status and speed in the device management interface and replace if any physical damage to the cable or connectors is observed.

Usage recommendations

Use the cable within rack or between adjacent racks where the 3 m length is appropriate; avoid tight bends and excessive force on the connector latches. Keep connectors free of dust and handle with care when inserting and removing to maintain reliable electrical contact and low-latency performance.