Description
The AddOn QSFPDD-8SFP56-PDAC1M-AO is a high-performance, MSA and TAA compliant 400GBase-CU direct attach cable designed for reliable, high-speed interconnects between QSFP-DD and 8x SFP56 ports. Operating over passive twinax copper with a reach of up to 1 meter (3.3 ft), this DAC supports up to 56 Gbps per channel using PAM4 signaling, delivering an aggregate bandwidth of 400Gbps. It is ideal for connecting switches, routers, servers, and other networking equipment in data centers and high-performance computing environments.
Engineered with a 360-degree cable shield termination and robust mechanical features, the cable offers low signal loss, superior EMI/EMC performance, and enhanced flexibility. Each unit is uniquely serialized, tested for full functionality, and comes with AddOn’s limited lifetime warranty for maximum reliability and peace of mind.
| Specification | Description |
|---|---|
| Part Number | QSFPDD-8SFP56-PDAC1M-AO |
| Brand | AddOn |
| Form Factor | QSFP-DD to 8x SFP56 |
| Data Rate | Up to 56 Gbps per channel (PAM4), 400Gbps aggregate |
| Cable Type | Passive Twinax Copper DAC |
| Length | 1 meter (3.3 ft) |
| Wire Gauge | 32 AWG |
| Cable Outer Diameter | 3.81 mm |
| Jacket Material | PVC |
| Flammability Rating | VW-1 |
| Impedance | 100 Ω |
| Voltage | 3.3V DC |
| Current (Signal Application) | 0.75 A |
| Operating Temperature | -10°C to +60°C |
| Compliance | QSFP-DD MSA Rev 3.4, SFF-8679, SFF-8636, IEEE 802.3bj/by/cd |
| Applications | Servers, Switches, Routers, Data Centers, HPC |
| Regulatory Compliance | IEC 60825-1, FDA CFR-21 1040.10/1040.11, TUV EN62368-1, UL/CSA 60950-1, FCC Part 15 sb.B, EN 55032/55024 |
| Features | Excellent EMI/EMC performance, pull-to-release latch design, low signal loss, RoHS-6 compliant |
| Warranty | Limited Lifetime Warranty |
Payment & Security
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Return Policy (Short Summary)
We offer a 30-day return window for most unopened, factory-sealed items.
Returns must be authorized before shipping back and must include all original packaging and accessories. Opened or used items are not returnable unless defective.
Some products—such as custom orders, special-order items, audio gear, software, and LED video walls—are non-returnable. Non-defective returns may be subject to a 20–30% restocking fee, and customers are responsible for return shipping costs.
For damaged or incorrect items, please contact us immediately.
From Scope to Sign-Off
A structured delivery process designed to reduce risk and keep projects moving.
Plan
Discovery, site review, requirements gathering, and project alignment. We define scope, constraints, and success criteria before any design work begins.
- Discovery calls & stakeholder interviews
- On-site survey & infrastructure review
- Requirements & use-case documentation
- Project scope, timeline & milestone alignment
Engineer
System design, schematics, signal flow, BOM development, and documentation. Every project leaves this phase with a complete engineering package.
- AV system design & signal flow diagrams
- Equipment selection & BOM development
- Rack layout & control system design
- As-built documentation package
Deploy
Procurement, logistics, installation, programming, commissioning, and training. We own the delivery from first shipment to final handoff.
- Authorized procurement & logistics coordination
- Physical installation & cable management
- Control system programming & configuration
- Commissioning, testing & end-user training
Support
Monitoring, maintenance, lifecycle planning, and long-term service agreements. We stay engaged long after project close.
- 24/7 remote system monitoring
- Preventive & reactive maintenance
- Technology lifecycle & refresh planning
- Long-term service level agreements
A decade of delivery — trusted by 275+ clients across industries
