Black Box QSFP-H40G-CU1M-BB 40 Gbps DAC network ethernet cable 3.28 ft

40 Gbps QSFP+ Direct Attach Cable

This Black Box QSFP+ DAC connects switches, routers and servers at up to 40 Gbps over a 3.28 ft passive copper assembly. It is programmed, tested and serialized for full MSA and SFF-8436 compliance and 100 % Cisco QSFP-H40G-CUxM= compatibility. The cable suits data-centre, storage and high-performance computing links where low latency and low power matter.

In-rack high-density 40 Gbps links

Network engineers building short-reach, high-bandwidth top-of-rack or intra-rack fabrics will appreciate the passive design and multi-vendor interoperability. Buyers who need longer reach, active signal conditioning or fibre-based media should look at alternative cable types. The fixed 3.28 ft length also rules out deployments that require greater rack-to-rack distance.

40 Gbps throughput headroom

The passive copper construction comfortably handles full 40 Gbps Ethernet and Fibre Channel traffic within the specified 3.28 ft span. Beyond that distance signal integrity degrades, so the cable runs out of headroom for extended runs or higher-speed standards such as 100 Gbps.