InfiniBand cable CBO 100G-Q28-S28-C-0301-BL 3 m QSFP28 to 4×SFP28

InfiniBand cable CBO 100G-Q28-S28-C-0301-BL is a 3 m direct-attach copper assembly with a QSFP28 connector on one end and four SFP28 connectors on the other. Designed for 100 Gb/s links, this cable provides a compact, low-latency interconnect for servers, switches and storage in data centre and high-performance computing environments. The passive copper design is intended for short-reach connections where reliable, high-speed connectivity and minimal signal processing are required.

Advantages

The cable supports 100 Gb/s aggregated bandwidth through a single QSFP28 port split into four independent SFP28 channels, enabling efficient port consolidation and straightforward top-of-rack or rack-to-rack cabling. Its passive copper construction offers predictable latency and low power consumption compared with active optical assemblies for short distances. The 3 m length provides flexibility for typical rack and cabinet layouts while keeping signal integrity for short-reach InfiniBand and Ethernet links.

Suitable for

• Direct server-to-switch or switch-to-switch connections in data centres
• High-performance computing clusters requiring low-latency interconnects
• Storage arrays and SAN environments with 100 Gb/s ports
• Top-of-rack consolidation where a QSFP28 port is split into multiple SFP28 links

Key specifications

• Connector types: QSFP28 (one end) to 4 × SFP28 (other end)
• Nominal aggregated data rate: 100 Gb/s (split across four lanes)
• Cable type: Passive copper direct-attach
• Cable length: 3 metres
• Intended reach: short-reach data centre connections
• Application: InfiniBand and compatible 100 Gb/s Ethernet deployments

How to use

Install the QSFP28 end into a compatible QSFP28 port on a switch or host adapter and insert the SFP28 ends into the target SFP28 ports on connected devices. Ensure ports are configured for the appropriate link speed and lane mapping according to your switch or HBA documentation. Route the cable to avoid tight bends and sharp edges; maintain recommended bend radius to preserve signal integrity. Passive assemblies do not require external power or transceiver configuration beyond standard port settings.

Usage recommendations

Use this passive 3 m InfiniBand cable for short intra-rack or adjacent-rack connections. Verify hardware compatibility with QSFP28-to-SFP28 passive breakouts and confirm firmware or switch settings for breakout mode where applicable. Avoid prolonged exposure to temperatures or environments outside data centre norms and replace the cable if physical damage or connector wear is observed.