BlueOptics InfiniBand/fibre optic cable 1m QSFP28 4xSFP28 Black

The BlueOptics InfiniBand/fibre optic cable 1m QSFP28 4xSFP28 Black is a 1‑meter direct attach cable (DAC) with a QSFP28 plug on one end and four SFP28 plugs on the other. Designed for short‑reach, high‑speed links in racks and adjacent racks, this cable supports 100GBase‑CR4 / 4x25GBASE‑CR electrical transmission and is suitable for connecting switches, routers and servers that accept QSFP28 to 4×SFP28 breakouts. The cable uses 26 AWG twinax conductor construction and follows MSA guidelines for compatibility with major hardware platforms.

Advantages

The cable offers a compact, passive twinax solution for 100 Gbit/s infrastructures with low power consumption and low latency. Its QSFP28 to 4×SFP28 breakout allows flexible port aggregation or segmentation without active transceivers. Built to MSA-compliant specifications and assembled with quality components, the cable provides reliable signal integrity for short-distance electrical connections and is optimized for rack-level connectivity.

Suitable for

• High-speed switch-to-switch links within the same rack or adjacent racks
• Server to top-of-rack or spine switch connections requiring 100G or 4×25G breakout
• Storage system interconnects and SAN fabrics using Ethernet, FCoE, Fibre Channel or InfiniBand protocols

Key specifications

• Length: 1 meter
• Connector type: QSFP28 (one end) to 4×SFP28 (other end)
• Transmission: 100GBase‑CR4 / 4×25GBASE‑CR (electrical DAC)
• Cable construction: passive twinax, 26 AWG conductors
• Typical use: short‑reach rack or adjacent rack connections

How to use

Insert the QSFP28 connector into a compatible QSFP28 port and plug each SFP28 connector into the corresponding SFP28 ports on the target device. Ensure that the host hardware and firmware explicitly support passive QSFP28 to 4×SFP28 DAC breakouts and the intended transmission protocol. Route the cable to avoid excessive bends and mechanical stress; maintain manufacturer‑recommended bend radius for twinax cabling. Verify link status in the network equipment management interface after installation.

Recommendations

Use this cable for short, rack‑level connections where passive twinax DACs are supported by the equipment. Do not use for long‑reach fibre links — select active optical transceivers or fiber optic cables for greater distances. For reliable operation, confirm compatibility with your switch or server model and keep cable runs within 1 meter as specified.