InfiniBand/fibre optic cable BlueOptics Q28-4S28-DAC-3M-NA 3m QSFP28 4xSFP28 Male/Male

The BlueOptics Q28-4S28-DAC-3M-NA is a 3 meter InfiniBand/fibre optic cable with a QSFP28 connector on one end and four SFP28 connectors on the other. Designed for high-density, high-throughput environments, this cable supports multi-channel connections and is intended for short-reach, low-latency links between switches, servers and storage systems. The cable’s build and connector types make it suitable for data center interconnects where reliable 100 Gbps-class or aggregated 4 x 25 Gbps connectivity is required over a 3 m link.

Advantages

This cable provides a compact direct-attach solution that eliminates the need for intermediate transceivers, reducing component count and simplifying rack cabling. The QSFP28 to 4xSFP28 configuration enables breakout from a single 100 Gbps port to four 25 Gbps ports without external adapters. Its fixed 3 m length helps maintain predictable signal integrity for short-reach links, while the pre-terminated male-to-male connectors allow quick, tool-free installation.

Suitable for

• Rack-to-rack and switch-to-server connections in data centers
• High-performance computing and InfiniBand clusters requiring low latency
• Aggregated 4 x 25 Gbps breakout deployments from a single QSFP28 port
• Short-reach links where a fixed 3 m cable length is optimal

Key specifications

• Cable length: 3 meters
• Connector type: QSFP28 (male) to 4 × SFP28 (male)
• Supported mode: Direct attach cable for short-reach interconnects
• Aggregate bandwidth: up to 100 Gbps (breakout to 4 × 25 Gbps)
• Application: InfiniBand and fibre optic high-speed networking

How to use

Connect the QSFP28 end to the QSFP28 port on a switch or adapter and plug the four SFP28 ends into the corresponding SFP28 ports on servers, NICs or storage devices. Ensure that equipment is powered down or ports are properly prepared according to your hardware vendor’s hot-plug guidelines if required. Verify link status through device management interfaces and confirm proper lane mapping and firmware compatibility for breakout operation.

Recommendations

Use this direct-attach cable for short-distance, high-bandwidth connections inside racks or between adjacent racks. Avoid tight bends and excessive mechanical stress on the cable and connectors; maintain bend radius recommended by equipment vendors to preserve signal performance. Confirm switch and NIC support for QSFP28-to-4xSFP28 breakout configurations and, if necessary, update device firmware to enable proper operation.