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

The QDD-400G-4QAC compatible cable series is intended for Cisco equipment requiring a 400G ACC connection. Its QSFP-DD to 4x 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-4QACHT Part Number: QDD-400G-4QAC

Product Highlights

• HT-manufactured compatible alternative for Cisco QDD-400G-4QAC
• 400G aggregate connectivity at 400Gb/s
• Interface configuration: QSFP-DD to 4x QSFP56
• Active Twinax
• Length configurations covered: 3m (10ft) and 5m (16ft)
• Conductor specification: 30 AWG
• Power consumption: ＜0.1W

This series page covers the following verified source length configurations: 3m (10ft) and 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-4QAC03

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 4x 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-4QAC 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-400G-4QAC, the required length from 3m (10ft) and 5m (16ft), and the OEM part number used by your equipment. The length-specific OEM identifiers above identify the exact product configurations so each reference can be reviewed and ordered separately.

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.