
For short reach 400Gb/s links in 400G Ethernet data center and cloud network environments, the 400G QSFP-DD to 4 x 100G QSFP56 Active Copper Breakout DAC Cable offers a factory terminated active twinax assembly with QSFP-DD to 4xQSFP56 connectors and a length of 3-7m. Active electronics inside the connectors extend the usable reach compared with passive copper while keeping power draw low. The cable meets QSFP-DD MSA SFF-8679 SFF-8636.
Product Highlights
- QSFP-DD to 4xQSFP56
- Data rate: 400Gb/s
- Cable type: Active Twinax
- Length: 3-7m
- Operating temperature: 0 to 70°C (32 to 158°F)
Specifications
| Part Number | QDD-400G-4QACxxx |
|---|---|
| Manufacturer | HT |
| Form Factor | QSFP-DD to 4xQSFP56 |
| Max Data Rate | 400Gb/s |
| Cable Length | 3-7m |
| Cable Type | Active Twinax |
| Jacket Material | PVC |
| Max Power Consumption | 0.1W |
| Modulation Format | PAM4 |
| Inbuilt FEC | No |
| Operating Temperature Range | 0 to 70°C (32 to 158°F) |
| Protocols | QSFP-DD MSA SFF-8679 SFF-8636 |
Applications
The 400G QSFP-DD to 4 x 100G QSFP56 Active Copper Breakout DAC Cable connects QSFP-DD to 4xQSFP56 ports at 400Gb/s in 400G Ethernet data center and cloud network environments. This unit is supplied at 3-7m. The breakout design lets one high speed port feed 4xQSFP56, which raises port utilization and simplifies cabling in dense rows. Our factory programs the compatibility coding for your switch brand before shipment and verifies each unit on real host equipment.
Standards and Compatibility
This product is designed and tested to comply with QSFP-DD MSA SFF-8679 SFF-8636. It plugs into any standards-based QSFP-DD to 4xQSFP56 port, and compatibility coding for specific switch or router brands can be done in our factory before shipment.
Ordering Information
This model is supplied at 3-7m under part number QDD-400G-4QACxxx. Other lengths of the same assembly can be produced on request. Volume pricing is available for project quantities.
Package
Products are first packed into blister trays or self-sealed bags and then into cartons. Standard labels and marks are applied by default, and customized packing and labeling are available on request.
Built to Your Spec
Our product line has grown with the industry for three decades, from GBIC-era modules to today's 800G and 1.6T interconnects. If the exact configuration you need is not listed, we can usually build it: custom lengths, mixed connector breakouts, OEM branding and project-specific firmware coding are all supported.
Delivery
Goods are normally sent by courier such as DHL, UPS, FedEx, TNT or EMS; air and sea freight are also available on request. Commonly used items are kept in stock for immediate shipment, and out-of-stock items are usually delivered within a few working days. We can also ship on your courier account or hand goods to your appointed forwarder.
Quality Assurance
Before any product leaves our factory it goes through optical performance testing, compatibility verification on real switch platforms and a final visual inspection. Our in-house test lab holds a wide range of current and legacy switches from major brands, so interoperability is proven on the actual equipment your network uses rather than assumed from paper specifications.



