Network Cable BlueOptics DAC-Q28-4S28-25G-2M-BL QSFP28 4xSFP28 InfiniBand 2m Black

The BlueOptics DAC-Q28-4S28-25G-2M-BL QSFP28 4xSFP28 InfiniBand 2m Black is a direct-attach copper (DAC) cable designed for short-reach, high-speed interconnects in data centre environments. This 2-metre, male-to-male assembly terminates in a QSFP28 connector on one end and four SFP28 connectors on the other, enabling aggregation or breakout of a single QSFP28 port into four independent 25G SFP28 links. The cable is supplied in a black jacket and built to support reliable, low-latency connections between switches, routers, host adapters and storage systems where InfiniBand or 25 Gigabit Ethernet links are required.

Advantages

This DAC offers a compact, cost-effective way to deploy multi-lane 25G links without the need for optical transceivers. The fixed 2 m length minimises signal loss for short-reach interconnects and simplifies cabling within racks and between adjacent equipment. The QSFP28-to-4xSFP28 breakout design provides flexible port consolidation and easy migration paths from higher-density QSFP ports to multiple SFP28 endpoints. The black outer jacket and robust construction contribute to durable handling in rack environments.

Suitable for

• Server-to-switch or switch-to-switch connections within the same rack or adjacent racks
• InfiniBand fabrics and 25 Gigabit Ethernet breakout applications
• High-density top-of-rack deployments requiring port aggregation or breakout
• Short-reach links in data centres, storage arrays and compute clusters

Key specifications

• Cable length: 2 m
• Connector configuration: QSFP28 (male) to 4 × SFP28 (male)
• Supported link types: InfiniBand and 25G Ethernet breakout
• Physical weight: 0.25 kg
• Product colour: Black

How to use

Ensure both devices support QSFP28-to-SFP28 breakout operation and are powered off or operating according to vendor hot-plug guidance before insertion. Align and insert the QSFP28 plug into the QSFP28 port and individually insert each SFP28 plug into the target SFP28 ports until latches engage. Verify link status on connected devices and configure port modes or link speeds in the switch or host adapter firmware as required for InfiniBand or 25G Ethernet operation. Avoid excessive bending near the connector ends and secure cables to prevent strain on the connectors.

Lietošanas ieteikumi

Install in short, rack-level connections to minimise attenuation; avoid running the DAC alongside high-power electrical cabling to reduce potential interference. For optimal reliability, follow equipment vendor compatibility lists and firmware requirements when using QSFP28 breakout functionality.