CBO DAC cable QFX-QSFP28-DAC-1M-BL 1 m, QSFP28 direct-attach copper, 100 Gbit/s

Passive CBO DAC cable QFX-QSFP28-DAC-1M-BL is a 1-meter QSFP28 direct-attach copper assembly engineered to provide 100 Gbit/s connectivity for short-reach links. The cable is intended for direct connection between QSFP28 ports in switches, routers and servers, offering a low-latency, energy-efficient alternative to optics for data centre top-of-rack and equipment interconnects.

Advantages

The direct-attach copper design delivers stable 100 Gbit/s performance with minimal signal conversion, reducing latency compared with optical transceivers. Being a passive cable, it consumes no additional power for signal amplification, contributing to lower operational energy use. The 1 m length supports dense rack and top-of-rack deployments where short, reliable interconnects are required. The QSFP28 connector form factor ensures compatibility with a wide range of high-speed network devices that accept QSFP28 direct connections.

Suitable for

Key specifications

How to use

Ensure both devices support QSFP28 direct-attach copper connections and are powered down or follow hot-plug procedures recommended by the device manufacturer. Align and insert each QSFP28 connector into the corresponding port until the latch engages. Verify link status and negotiated speed through the device management interface. To remove, release the connector latch and withdraw the module carefully to avoid bending or stressing the cable assembly.

Recommendations

Avoid routing the cable through sharp bends or tight cable management loops and maintain bend radii recommended for copper twinax assemblies. Use the 1 m passive QSFP28 DAC for short intra-rack links where a low-latency, energy-efficient connection is required and opt for optical modules or active cables for longer distances or equipment that does not accept passive QSFP28 direct attachments.