QDD-400-CU2M=

The QDD-400-CU2M is a passive copper cable for 400 Gigabit Ethernet, 2 m long, with a QSFP-DD connector fixed to each end. It works for a full-height rack where the switch sits mid-cabinet and hosts are spread above and below with a small service loop. It is intended for data-centre environments and has a standard commercial temperature range. Seat each plug until it latches, then give the cable a gentle tug to confirm the pull-tab latch has engaged. Copper at this speed is practical only over short spans, such as switch-to-server or neighbouring devices in a row. The data sheet gives a maximum power of 1.5 W per end and a 0 to 70 degrees Celsius operating range for the copper cables. Check the host platform's supported-cable list before deploying, as support varies by switch family and software release. Cisco's 400G QSFP-DD data sheet lists it in the QDD-400-CU family, with forward error correction performed by the host platform. Neat hook-and-loop strapping helps keep front-to-back airflow clear around the switch faceplate.