DAC cable CBO QFX-QSFP-DACBO-3M-BL 3 m QSFP to 4×SFP+

Direct attach copper (DAC) cable CBO QFX-QSFP-DACBO-3M-BL is a 3 meter fixed-length twinax assembly that provides a QSFP connector on one end and four SFP+ interfaces on the other. Designed for short-reach interconnects in data centre switches, servers and storage systems that support QSFP-to-SFP+ breakout, the cable enables a single 40 Gbps QSFP port to be split into four separate 10 Gbps SFP+ links. The passive copper construction delivers low latency and reduced power consumption compared with active optical modules, making it suitable for high-density, cost-sensitive deployments.

Advantages

The DAC cable offers a reliable, low-latency physical layer solution for 40 Gbps to 4×10 Gbps breakout configurations without the need for additional transceivers or fibre patching. Its fixed 3 m length simplifies cabling planning in rack and top-of-rack layouts and eliminates optical transceiver power draw and heat generation typical of active modules. The twinax construction provides consistent signal integrity for short-distance links and a compact connector design that fits standard QSFP and SFP+ ports.

Suitable for

• Short-reach connections between QSFP-capable switches and multiple SFP+ ports
• Server-to-switch or storage-to-switch links requiring breakout from 40 Gbps to 10 Gbps lanes
• High-density rack environments where power and cooling budgets are constrained
• Data centre top-of-rack (ToR) and aggregation layer cabling

Key specifications

• Length: 3 metres
• Connector types: QSFP (one end) to 4 × SFP+ (other end)
• Transmission: 40 Gbps aggregate to 4 × 10 Gbps lanes
• Cable type: Passive twinax copper assembly
• Intended reach: short-reach intra-rack or adjacent-rack links
• Latency: low, suitable for latency-sensitive applications
• Power: passive design, lower power consumption than active optical modules

How to use

Install the DAC cable by inserting the QSFP end into a compatible 40 Gbps QSFP port and connecting the four SFP+ ends to SFP+ ports on the target devices. Ensure that connected equipment supports QSFP-to-4×SFP+ breakout or the specific breakout mode required by the switch or host. Verify port speed and lane mapping in the device configuration and check link status indicators after connection. No additional transceivers, fibre patch panels, or power supplies are required for standard passive operation.

Usage recommendations

Use this cable for short-distance interconnects within racks or between adjacent racks. Avoid tight bends and mechanical strain on the cable and connectors; maintain manufacturer-recommended bend radius. For installations requiring longer reach or optical isolation, consider appropriate active or optical transceiver solutions instead of passive twinax.