Network Cable BlueLAN DAC-QSFP-4SFP28-25G-2M QSFP28 to 4x25GBASE-CR SFP28 2M Blue

The BlueLAN DAC-QSFP-4SFP28-25G-2M is a passive direct attach copper breakout cable engineered for high-speed data transmission in rack and data center environments. One end terminates in a QSFP28 connector and the other end breaks out into four SFP28 connectors, enabling aggregation of four 25 Gbps links or a single 100 Gbps link over a short-reach copper assembly. The 2 meter length and AWG26 conductor gauge deliver predictable signal integrity and low latency for short-distance interconnects between switches, servers and storage systems.

Advantages

This breakout cable offers a compact, low-power alternative to optical transceivers and fiber assemblies for short-reach connections. Passive construction reduces power consumption and heat generation compared with active or optical modules, while the integrated breakout simplifies cabling by combining four 25G links into a single QSFP28 port. The 2 m length is suitable for top-of-rack and adjacent-rack connections and the AWG26 copper conductors provide mechanical flexibility and consistent impedance matching for reliable performance.

Suitable for

• Aggregating four 25GBASE-CR links into one 100GBASE-CR4 port
• Direct connections between QSFP28 switch ports and multiple SFP28 server or NIC ports
• Top-of-rack switch to server interconnects within the same rack or adjacent racks
• Short-reach, high-bandwidth links in data centers and server rooms

Key specifications

• Connector types: QSFP28 to 4 × SFP28
• Supported standards: 100GBASE-CR4 and 25GBASE-CR
• Length: 2 meters
• Conductor gauge: AWG26
• Passive direct attach (no active electronics)
• Typical use: short-reach copper breakout cable for high-density interconnects

How to use

Insert the QSFP28 end into the QSFP28 port on a compatible switch or aggregation device and connect each SFP28 plug into the corresponding SFP28 ports on target servers, NICs or storage devices. Ensure ports are disabled or in a safe state during installation if required by your hardware vendor, then enable and verify link status from the connected devices. No external power or configuration is required by the cable itself; link negotiation and speed settings are managed by the host devices according to supported standards.

Usage recommendations

Use the cable for short-distance interconnects up to 2 m inside racks or between adjacent racks. Verify vendor compatibility for passive DACs with your network equipment and check that device firmware and port settings support 25G and 100G breakout modes. Avoid tight bends and excessive pulling force on the cable; maintain manufacturer-recommended bend radius and secure connectors to prevent accidental disconnection.