InfiniBand/fibre optic cable BlueOptics Q28-4S28-DAC-1M-PS-BL 1m QSFP28 4xSFP28

The BlueOptics Q28-4S28-DAC-1M-PS-BL is a 1 meter direct attach cable (DAC) with a QSFP28 connector on one end and four SFP28 connectors on the other. Designed for short-range high-speed links in racks and between adjacent racks, this 100GBase-CR4 / 4x25GBASE-CR passive twinax copper cable follows MSA guidelines and supports Ethernet, FCoE, Fibre Channel and InfiniBand applications up to 100 Gbit/s over a 1 m distance. The cable is specified at 26 AWG and is intended for use with hardware platforms that support QSFP28 breakout to 4×SFP28 connections.

Advantages

The cable provides a low-latency, low-power passive connection for high-density data center environments, offering a cost-effective alternative to active modules for short-distance interconnects. Built to MSA compatibility, it is suitable for multi-vendor systems and is manufactured from industry-grade components to achieve stable performance and extended service life. Its QSFP28 to 4×SFP28 breakout design enables flexible connectivity between 100G ports and 4×25G ports without additional transceivers.

Suitable for

• Connecting QSFP28 ports to four SFP28 ports in rack and adjacent-rack deployments
• Short-range 100G/4×25G links in switches, routers and storage systems
• Ethernet, FCoE, Fibre Channel and InfiniBand applications at up to 100 Gbit/s
• High-density data center top-of-rack and spine-leaf cabling

Key specifications

• Length: 1 meter
• Connector types: QSFP28 (one end) to 4×SFP28 (other end)
• Data rates supported: up to 100 Gbit/s (100GBase-CR4 / 4×25GBASE-CR)
• Cable type: passive twinax copper (DAC)
• Wire gauge: 26 AWG
• Compliance: MSA QSFP28 breakout DAC electrical/mechanical compatibility

How to use

Insert the QSFP28 connector into a compatible QSFP28 port and plug each SFP28 connector into the corresponding 25G-capable SFP28 ports. Ensure that the connected devices support passive DACs and the specific breakout configuration (QSFP28 to 4×SFP28). No external power or configuration is required for the passive cable itself; device side settings such as link speed, lane mapping and firmware compatibility should be verified according to the hardware vendor instructions before deployment.

Recommendations

For reliable operation, use this 1 m passive DAC for short copper connections inside racks or between adjacent racks only. Verify vendor compatibility with QSFP28 breakout to SFP28 on both the switch and the target device, and confirm firmware or driver versions when deploying in multi-vendor environments. Avoid sharp bends and mechanical stress on connectors; follow standard data center cable management and ESD handling procedures.