BlueOptics K9HPR-BL InfiniBand/fibre optic cable 1 m QSFP28 4xSFP28 Male/Male

The BlueOptics K9HPR-BL InfiniBand/fibre optic cable is a 1 m direct attach solution with a QSFP28 connector on one end and four SFP28 connectors on the other (QSFP28 to 4xSFP28, male/male). Designed for short-reach, high-speed interconnects in racks and adjacent racks, this passive twinax copper cable supports 100GBase-CR4 and 4x25GBASE-CR electrical transmission and is suitable for environments that require low latency and reliable 100 Gbit/s links over a 1 metre distance.

Advantages

The cable follows MSA-compliant form factors and uses 26 AWG twinax construction to provide stable signal integrity for 100 Gbit/s and 4x25 Gbit/s channel aggregation. Passive design keeps power consumption minimal and reduces points of failure compared with active modules. Components are selected to meet standard quality and compatibility requirements with major networking hardware that supports the equivalent cable type.

Suitable for

• Short-reach connections between switches and routers within the same rack or adjacent racks
• High-density data centre uplinks and top-of-rack aggregation
• Interconnects for storage systems and servers supporting 100GBase-CR4 or 4x25GBASE-CR
• InfiniBand and Ethernet applications requiring low latency 100 Gbit/s links

Key specifications

• Connector type: QSFP28 (one end) to 4x SFP28 (other end), male to male
• Length: 1 metre
• Cable type: passive twinax copper
• Wire gauge: 26 AWG
• Supported protocols: 100GBase-CR4, 4x25GBASE-CR, Ethernet, FCoE, Fibre Channel, InfiniBand (protocol support depends on device firmware)
• Typical power consumption: passive design (very low power draw)

How to use

Insert the QSFP28 connector into the corresponding QSFP28 port on your switch or NIC, and plug the four SFP28 connectors into the target SFP28 ports on the connected device or breakout module, ensuring secure mating until the retention mechanism clicks. Verify that both devices support passive DAC twinax cables and the intended transmission modes (100GBase-CR4 or 4x25GBASE-CR) in their configuration and firmware. After physical insertion, confirm link status and speed in your device management interface and perform a short traffic test to validate connectivity.

Recommendations

Use the BlueOptics K9HPR-BL cable for short-distance rack-level links where passive twinax is supported. Avoid sharp bends and maintain minimum bend radius along the cable run. Ensure both connected devices explicitly support passive QSFP28-to-4xSFP28 DACs and the intended protocols. For deployment in critical systems, test the cable in your environment before large-scale rollout and keep spare cables on hand to simplify maintenance.