Dell QDD-400G-4QAC Compatible 400G QSFP-DD 8 x 50G PAM4 to 4 x 100G QSFP56 2 x 50G PAM4 Active Copper Breakout Cable
A 400G direct-attached link depends on the correct host identity, interface mode and physical length. This page covers the Dell QDD-400G-4QAC compatible ACC series in QSFP-DD to 4x QSFP56, including 3m (10ft) and 5m (16ft). Each documented length-specific OEM reference is linked separately where an individual product page is available.
Series Part Number: QDD-400G-4QACHT Part Number: QDD-400G-4QAC
Product Highlights
- HT-manufactured compatible alternative for Dell 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
Available Lengths and Corresponding Part Numbers
The documented series configuration is 3m (10ft) and 5m (16ft). Use the relevant OEM reference below together with the HT identity and required length when requesting a quotation. If another length carries a different OEM part number, it must be reviewed and ordered as that distinct configuration.
Compatible OEM Part Numbers
- QDD-400G-4QAC03
Specifications
| HT Part Number | QDD-400G-4QAC |
|---|---|
| Manufacturer | HT |
| Form Factor | QSFP-DD to 4x QSFP56 |
| Max Data Rate | 400Gb/s |
| Cable Length Options Covered | 3m (10ft) and 5m (16ft) |
| Cable Type | Active Twinax |
| Minimum Bend Radius | 70mm |
| Wire AWG | 30 AWG |
| Jacket Material | PVC |
| Power Consumption | ＜0.1W |
| Modulation Format | PAM4 |
| Inbuilt FEC | No |
| Operating Temperature Range | 0 to 70°C (32 to 158°F) |
| Inbuilt FEC | QSFP-DD MSASFF-8679SFF-8636 |
Field Installation and Maintenance
Inspect the route and both connectors before installation, then support the cable without pulling on either connector housing. During maintenance, release the latch properly rather than using the cable as a handle. Keep protection on unused ends, and if the assembly is removed for later use, coil it loosely and record its part number so the same length can be returned to service. For this series, keep the interface rate, ACC construction and length-specific OEM reference together throughout that review.
Applications and Deployment
Active copper assemblies add signal conditioning while retaining the convenience of a direct-attached cable. They are appropriate where the equipment supports the stated active-cable type and the route exceeds the practical limits of a comparable passive assembly. Per-end power, airflow and host qualification should be assessed before high-density deployment. For this series, the listed interface is QSFP-DD to 4x QSFP56 and the aggregate rate is 400G.
Cable Construction and Routing
For this assembly, the conductor specification is 30 AWG; the jacket material is PVC; the minimum bend radius is 70mm; the power consumption is ＜0.1W. These parameters belong in the installation review rather than being treated as catalogue trivia. Route the cable through its intended managers without tension, avoid pressure close to the connector boots and leave enough space to operate the latches. Any service loop must respect the stated bend limit.
Quality Assurance and Packaging
The cable and both connectors are inspected before a functional link test. Connector protection and bend-safe packing reduce handling damage during transport and storage. Customer or site labels can be added for field inventories, with different lengths separated to simplify issue and return of spare assemblies. Both connector ends are inspected as part of the complete assembly, and protective packing is selected to avoid tight bends during transport and storage.
Dell Compatibility and Factory Testing
A field-ready cable needs both correct identification and a stable operating link. Our pre-packing check therefore includes the connectors, host recognition and link behavior. For equipment with uncertain revision history, providing the host model and software release helps identify compatibility requirements before the assembly reaches the installation site. Series-level inspection is followed by the exact length and OEM configuration selected for dispatch. Functional verification includes link establishment and diagnostic indications where the host exposes them.
Ordering Information
Request the cable by its exact part number and length, and state the equipment model if compatibility confirmation is needed. Site orders can list quantities by rack or installation team. Any requested label should retain the part number so a removed or spare cable can still be identified accurately. For this series, follow the corresponding length link, quote that exact OEM part number and keep different lengths on separate order lines. HT part number QDD-400G-4QAC identifies the product family; the linked page provides the final length-specific identity.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.
Frequently Asked Questions
Is this an original Dell cable?
No. It is an HT-manufactured compatible cable for equipment that specifies QDD-400G-4QAC, not an original Dell-branded product.
Are different lengths and OEM part numbers separate products?
Yes. Where a length has its own OEM reference, follow the corresponding link above and order that exact part number on its own line. Do not substitute another length only because the connector arrangement is the same.
Does this ACC cable require separate modules at each end?
No. The connector ends and cable form one complete direct-attach assembly. The ends are not detachable standalone transceivers, and the complete product is tested together.
What information helps confirm compatibility?
Provide the equipment manufacturer and model, port type, hardware revision and software release, together with the required OEM reference, length and quantity. Breakout projects should also identify the intended lane configuration.
