BlueOptics BlueLAN passive QSFP112 Direct Attach Cable 400GBASE Ethernet / InfiniBand, 1 m

The BlueOptics BlueLAN passive QSFP112 Direct Attach Cable 400GBASE Ethernet / InfiniBand, 1 m is a fixed twinax DAC designed for short-reach, high-speed interconnects. It provides a direct electrical connection between QSFP112 ports and supports 400GBASE Ethernet and InfiniBand protocols. The cable is intended for use in data centre topologies requiring low latency and low power consumption, such as spine-leaf links, switch-to-router connections and server-to-switch interconnects.

Advantages

This passive QSFP112 direct attach cable delivers a straightforward, low-latency electrical link without the need for active components or transceivers. It offers predictable signal integrity for short distances and reduces power consumption compared with active optical solutions. The fixed 1 m length simplifies cable management in dense rack environments and is compatible with equipment that accepts QSFP112 form-factor interconnects.

Suitable for

• Data centre spine-leaf and leaf-to-leaf links requiring 400G bandwidth
• High-throughput switch-to-switch and switch-to-router connections
• Server to top-of-rack switch interconnects with minimal latency requirements
• InfiniBand fabrics and high-performance computing clusters using QSFP112 ports

When it may not be suitable

This passive twinax DAC is intended for short-reach links; it is not suitable for long-distance connections or runs that exceed the supported electrical reach for passive QSFP112 cables. Environments that require optical isolation, longer link spans, or active signal conditioning will need optical transceivers or active cables rather than a passive DAC.

Key specifications

• Form factor: QSFP112 direct attach cable (fixed twinax)
• Supported protocols: 400GBASE Ethernet and InfiniBand
• Length: 1 m
• Link type: passive electrical connection
• Designed for: short-reach high-speed interconnects with low latency and low power

How to use

Insert each QSFP112 connector into the corresponding QSFP112 port on your network devices until the latch engages. Ensure connectors and ports are free of dust and debris before insertion. Verify link status and speed through device management interfaces after connection. For reliable operation, avoid sharp bends and excessive mechanical stress on the cable and maintain appropriate airflow around connected equipment.

What to consider before purchase

• Verify both devices support QSFP112 ports and the desired 400GBASE Ethernet or InfiniBand rates
• Confirm 1 m length is sufficient for your rack or cabinet layout and cable management
• Check device compatibility lists or vendor documentation for passive DAC support
• Assess whether a passive electrical cable meets reach and isolation requirements for your deployment

Usage recommendations

Use this 1 m passive QSFP112 DAC for short, high-density links inside racks or between adjacent racks where low latency and low power are priorities. For runs beyond typical short-reach limits or where optical links are required, choose appropriate optical transceivers or active cables.