QDD-400-CU0 — Cisco QSFP-DD

The QDD-400-CU0 is a Cisco passive DAC (Direct Attach Copper) cable in QSFP-DD form factor, designed for zero-length direct connections — typically loopback testing or face-to-face back-to-back ports. This QSFP-DD format is part of Cisco high-density lineup, engineered for seamless integration into modern chassis and patch panels that support this connector type.

This model is aimed at infrastructure teams that need to test, loop, or directly connect two QSFP-DD ports in immediate proximity — particularly for configuration validation or ultra-short in-cabinet cabling. Genuine Cisco hardware, manufacturer warranty.