Network Cable BlueLAN QSFP28-4SFP28-DAC-2M QSFP28 to 4x25GBASE-CR SFP28 100GBASE-CR4 2m Blue

The BlueLAN QSFP28-4SFP28-DAC-2M is a passive Direct Attach Breakout Cable designed for high-density, short-reach interconnects in data centers and networking racks. One end terminates in a QSFP28 connector while the other end provides four SFP28 connectors, enabling a single 100G link to be split into four independent 25G channels. The 2 meter length and AWG26 conductor gauge deliver low insertion loss and predictable electrical performance for 100GBASE-CR4 and 4x25GBASE-CR applications.

Advantages

This breakout cable offers a straightforward, energy-efficient way to connect QSFP28 ports to multiple SFP28 ports without active electronics, reducing latency and eliminating the need for transceivers. Passive construction ensures compatibility with standard copper-based CR and CR4 deployments while keeping power consumption minimal. The integrated four SFP28 connectors simplify rack cabling and reduce the number of separate cables required for multi-lane 25G connections.

Suitable for

• Interconnects between top-of-rack switches and server NICs supporting 25G
• Aggregating four 25G links into a single 100G QSFP28 port
• High-performance computing clusters with short-reach copper links
• Data center patching and spine-to-leaf connections within the same rack or adjacent racks

Key specifications

• Connector types: QSFP28 to 4 × SFP28
• Cable type: Passive direct attach copper breakout
• Supported standards: 100GBASE-CR4, 4×25GBASE-CR
• Length: 2 meters
• Conductor gauge: AWG26
• Lane configuration: One 100G lane split into four independent 25G lanes

How to use

Insert the QSFP28 end into the 100G QSFP28 port and each SFP28 plug into the corresponding 25G-capable SFP28 ports on servers, switches or NICs. Ensure devices are powered down or port LEDs indicate readiness according to your equipment’s hot-plug guidelines, then verify link status in the switch or host interface. No additional transceivers or power supplies are required for passive operation. If link training or speed negotiation is supported by the devices, confirm the ports are configured for 25G or 100G as appropriate.

Usage recommendations

Use this cable for short-reach copper connections within racks or between adjacent racks; avoid routes with tight bends or crushing forces to maintain signal integrity. Verify compatibility with your switch and NIC vendor documentation for passive DAC support and any required port settings. For longer runs or if vendor interoperability requires, consider active solutions or fiber-based transceivers instead of passive direct attach copper.