Cisco QDD-4ZQ100-CU Compatible 400G QSFP-DD 8 x 50G PAM4 to 4 x 100G QSFP56 2 x 50G PAM4 Passive Copper Breakout Cable

Use this DAC cable where a 400G link is required between compatible QSFP-DD to 4x QSFP56 ports. This HT version corresponds to Cisco QDD-4ZQ100-CU and covers 0.5m (2ft), 1m (3ft), 1.5m (5ft), 2m (7ft), 2.5m (8ft) and 3m (10ft); electrical or optical construction follows the DAC specification rather than a detachable transceiver-and-patch-cord arrangement.

Series Part Number: QDD-4ZQ100-CUHT Part Number: QDD-4ZQ100-CU

Product Highlights

• HT-manufactured compatible alternative for Cisco QDD-4ZQ100-CU
• 400G aggregate connectivity at 400Gbps
• Interface configuration: QSFP-DD to 4x QSFP56
• DAC / Copper
• Length configurations covered: 0.5m (2ft), 1m (3ft), 1.5m (5ft), 2m (7ft), 2.5m (8ft) and 3m (10ft)
• Conductor specification: 28AWG
• Power consumption: 0.1W (QSFP-DD End)0.1W (QSFP56 Per End)
• Operating temperature: 0 to 70°C (32 to 158°F)

• QDD-4ZQ100-CU0.5M
• QDD-4ZQ100-CU1M
• QDD-4ZQ100-CU1.5M
• QDD-4ZQ100-CU2M
• QDD-4ZQ100-CU2.5M
• QDD-4ZQ100-CU3M

Passive DAC assemblies are normally used for short switch-to-switch, switch-to-server and rack-adjacent links. They draw very little power and avoid separate optical components, but the selected length must remain within the host and cable specification.

The QSFP-DD to 4x QSFP56 interface and 400G data rate must match the equipment at both ends. The source application is listed as 400G Ethernet. For breakout versions, confirm the lane mapping and the speed of every downstream port; matching connector shapes alone does not establish interoperability.

The assembly is configured for equipment that recognizes the QDD-4ZQ100-CU series. Before shipment, we check connector identification, link establishment and electrical link stability, signal integrity and diagnostic readouts. Host hardware and firmware revisions can affect third-party cable acceptance, so customers can provide the switch, server or accelerator model and software release for a pre-order compatibility review.

Quote HT part number QDD-4ZQ100-CU, the required length from 0.5m (2ft), 1m (3ft), 1.5m (5ft), 2m (7ft), 2.5m (8ft) and 3m (10ft), and the OEM part number used by your equipment. The length-specific OEM identifiers above link to their own product pages so each reference can be ordered separately.

Every DAC assembly undergoes continuity and link testing, compatibility verification and a visual inspection of both connector ends. Cables are coiled without exceeding their minimum bend radius, fitted with connector protection and packed in anti-static bags or protective trays before cartoning. Project labels and packing lists are available for volume orders.

Standard configurations normally ship within one to three working days. Worldwide courier, air freight and sea freight options are available, and shipments can also be sent on your own courier account or delivered to an appointed forwarder.