DAC-kaapeli BlueOptics DAC-Q28-4SFP28-25G-5M QSFP28 4xSFP28 5m

The BlueOptics DAC-Q28-4SFP28-25G-5M QSFP28 4xSFP28 5m is a direct attach copper (DAC) cable engineered for short-reach, high-bandwidth interconnects in data centers and network racks. One end of the cable uses a QSFP28 connector while the other terminates in four SFP28 connectors, enabling aggregation or breakout of a 100Gbps interface into four 25Gbps lanes over a 5 metre copper link. The cable comes in a compact, flexible black jacket suitable for dense cabling environments and low-latency links between switches, servers, and storage systems.

Advantages

This DAC cable provides a cost-efficient, low-power alternative to optical transceivers for short distances, offering native support for 25G per lane speeds and reliable signal integrity across the specified 5 m span. Its integrated breakout configuration simplifies connectivity where a single QSFP28 port must connect to multiple SFP28 ports without additional transceiver modules. The copper construction eliminates the need for separate fiber patching and reduces overall port and module costs while maintaining predictable latency and signal performance.

Suitable for

Key specifications

How to use

Ensure both devices support QSFP28-to-4×SFP28 breakout connections and that ports are configured for the desired interface rates. Power down or follow the hot-plug guidance of your hardware before connecting if recommended by the vendor. Insert the QSFP28 end firmly into the QSFP28 port and route the cable to avoid sharp bends, then insert each SFP28 connector into the destination SFP28 ports. Verify link status and speed on each SFP28 lane through device management interfaces and perform any required firmware or port configuration such as lane mapping or speed negotiation.

Recommendations

Use this DAC cable for short-reach links up to 5 m in controlled data center environments. Avoid excessive bending and mechanical stress on connectors, keep the cable away from high electromagnetic interference sources, and confirm compatibility with your switch and server models before deployment to ensure optimal performance.