Keep 40 GbE infrastructure connected with a 4 m passive QSFP direct attach cable built for Mellanox-compatible deployments. This cable is well suited for short-reach links between switches, servers, and adjacent rack equipment where predictable connectivity and simple installation are priorities. Passive DAC construction avoids the added electronics of active assemblies, which can make it a practical choice for short-distance interconnects where cost efficiency and low power requirements matter. The result is a clean, direct connection that fits well in tightly managed rack environments. For teams standardizing on 40 GbE, this cable provides a reliable way to connect compatible QSFP ports without adding unnecessary complexity. It is a strong fit for data center fabrics, storage networks, and aggregation layers where short-reach performance, port compatibility, and cable discipline all contribute to operational quality. When the goal is to connect the right ports with the right length, this 4 m DAC is built to do exactly that.