NVIDIA/Mellanox QDD-400G-2QAC Compatible 400G QSFP-DD 8 x 50G PAM4 to 2 x 200G QSFP56 4 x 50G PAM4 Ethernet Active Copper Breakout Cable

The QDD-400G-2QAC compatible cable series is intended for NVIDIA/Mellanox equipment requiring a 400G ACC connection. Its QSFP-DD to 2x QSFP56 configuration supports an active copper connection with signal conditioning for the stated high-speed interface, while the verified source lengths listed below make length selection explicit.

Series Part Number: QDD-400G-2QACHT Part Number: QDD-400G-2QAC

Product Highlights

• HT-manufactured compatible alternative for NVIDIA/Mellanox QDD-400G-2QAC
• 400G aggregate connectivity at 400Gbps
• Interface configuration: QSFP-DD to 2x QSFP56
• Active
• Length configurations covered: 5m (16ft)
• Conductor specification: 28AWG
• Power consumption: 1.45W（QSFP-DD End） 0.62W（QSFP56 Per End）
• Operating temperature: 0 to 70°C (32 to 158°F)

This series page covers the following verified source length configurations: 5m (16ft). Each documented length-specific OEM reference is treated as its own product configuration; follow the corresponding product link where available. Select the required length when requesting a quotation; custom project lengths are available for discussion.

• QDD-400G-2QAC05

ACC assemblies use active copper signal conditioning to extend practical copper-link reach while retaining a direct-attach installation. They suit high-density switch and accelerator connections where the host supports the stated active-cable type and power requirement.

The QSFP-DD to 2x QSFP56 interface and 400G data rate must match the equipment at both ends. 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-400G-2QAC 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.

This series is ordered by the base HT part number QDD-400G-2QAC plus length and compatibility requirement. Available source configurations documented on this page are 5m (16ft); other project lengths can be discussed with the factory, and each length-specific OEM reference is reviewed under its own product configuration.

Every ACC 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.