InfiniBand/fibre optic cable BlueOptics 25GB-4-C01-QSFP28-BL 1 m 4xSFP28

The BlueOptics 25GB-4-C01-QSFP28-BL is a 1 m InfiniBand/fibre optic direct attach cable with a QSFP28 plug on one end and four SFP28 plugs on the other. Designed for short-reach, high-bandwidth interconnects inside racks or between adjacent racks, the cable supports 100GBase-CR4 / 4x25GBASE-CR electrical links and is suitable for Ethernet, FCoE, Fibre Channel and InfiniBand applications up to 100 Gbit/s over a 1 m distance. The male-to-male connection and 26 AWG twinax construction provide a simple, low-latency link for server, switch and storage hardware that support QSFP28 and SFP28 interfaces.

Advantages

This BlueOptics cable offers a compact, low-power and low-latency solution for high-speed short-distance connections. As a passive direct attach twinax cable it does not require external power or active signal conditioning, which reduces complexity and failure points. The cable is manufactured to MSA-compliant specifications and uses robust components to deliver consistent signal integrity and a long service life suitable for dense data center environments.

Suitable for

• Connecting QSFP28 ports to multiple SFP28 ports within the same rack
• Short-reach 100G to 4×25G conversions in switch-to-switch or switch-to-server links
• High-bandwidth links for storage systems and aggregation switches
• Low-latency InfiniBand and fibre channel connections over short distances

Key specifications

• Length: 1 meter
• Connector types: QSFP28 to 4 × SFP28 (male to male)
• Transmission: 100GBase-CR4 / 4×25GBASE-CR electrical twinax
• Cable type: Passive direct attach twinax copper (26 AWG)
• Supported protocols: Ethernet, FCoE, Fibre Channel, InfiniBand (up to 100 Gbit/s over 1 m)
• Compliance: MSA-compliant mechanical and electrical interfaces

How to use

Ensure both devices support passive DAC twinax cabling and the relevant 100GBase-CR4 or 4×25GBASE-CR profiles. Power down or follow hot-plug guidelines for your hardware platform, align the QSFP28 and SFP28 plugs with the respective ports and insert until the retention latch engages. For multiport QSFP28-to-4×SFP28 use cases, verify lane mapping and link negotiation in the connected devices and check link status indicators after insertion. Remove the cable by depressing the latch and pulling straight out to avoid mechanical strain on connectors.

Recommendations

Use this 1 m BlueOptics QSFP28-to-4×SFP28 direct attach cable for short, high-bandwidth interconnects inside racks or between adjacent racks where low latency and low power consumption are priorities. Avoid routing the twinax cable near high-temperature sources, keep bend radii within the manufacturer’s limits, and confirm device compatibility with passive DACs to ensure reliable operation.