DAC Cable BlueOptics X4DACBL3-BL 3m QSFP 4x SFP+ Black

The BlueOptics X4DACBL3-BL 3m QSFP 4x SFP+ Black is a direct attach copper (DAC) cable designed for short-range, high-speed connections in networking environments. With a QSFP plug on one end and four SFP+ plugs on the other, this 3-meter cable enables aggregation of four 10Gb/s links into a single QSFP port for efficient rack-to-rack or within-rack interconnects. The cable is intended for data center and server switch connections where low latency and dependable throughput are required.

Advantages

This DAC cable offers low latency and consistent electrical performance over a 3 m reach, reducing power consumption compared with active optical alternatives. The integrated QSFP-to-4xSFP+ configuration simplifies cabling by combining multiple lanes into a single harness, lowering port usage and physical cable bulk. The cable’s construction ensures stable signal integrity suitable for high-density installations and hot-pluggable compatibility with supported QSFP and SFP+ ports.

Suitable for

• Top-of-rack and end-of-row switch interconnects
• Connecting servers to aggregation switches in data centers
• High-density switch fabric environments requiring multiple 10Gb links
• Short-distance links inside server racks or between adjacent racks

Key specifications

• Cable type: Direct attach copper (passive DAC)
• Length: 3 meters
• Connector A: QSFP (quad SFP+ interface)
• Connector B: 4 × SFP+
• Aggregate data rate: supports four 10 Gbps lanes (up to 40 Gbps total via QSFP)
• Typical use distance: short-reach intra-rack or inter-rack connections
• Compatibility: QSFP and SFP+ ports supporting passive DAC interconnects

How to use

Ensure both the QSFP port and the target SFP+ ports on your switches or servers are powered down or follow hot-plug guidance from the equipment vendor before insertion. Align the QSFP connector with the QSFP socket and gently insert until it seats; then connect each SFP+ plug to the corresponding SFP+ ports. Verify link status in the host devices’ management interfaces and confirm lanes are aggregated as expected. If the devices support hot-plug, the cable can be inserted or removed while the equipment is running, but follow vendor instructions to avoid link flapping.

Recommendations

Use this 3 m DAC cable for short, high-performance links inside racks or between adjacent racks. Avoid routing the cable near sources of strong electromagnetic interference and do not exceed the recommended bend radius. Consult your switch or server documentation for compatibility with passive DAC cables and for any firmware or transceiver restrictions.