Description
The AddOn Arista Networks® QDD-400G-VSR4-AO is a high-performance, TAA-compliant QSFP-DD transceiver designed for ultra-high-speed 400GBase-SR4 Ethernet connectivity in modern data center and enterprise environments. It provides 400G throughput up to 50 meters over multi-mode fiber (MMF) using an 850nm wavelength and an MPO-12 connector, delivering reliable, low-latency data transmission.
Engineered to meet or exceed OEM specifications, this module is 100% compatible with Arista Networks® systems and supports CMIS Rev. 4.0, ensuring seamless network integration. Its hot-swappable design, robust ESD protection, and digital optical monitoring (DOM) capabilities allow real-time performance monitoring and simplified maintenance. Fully compliant with IEEE 802.3ck, IEEE 802.3db, and QSFP-DD MSA standards, this transceiver is ideal for next-generation high-bandwidth applications such as cloud computing, hyperscale data centers, and high-performance computing networks.
| Specification | Details |
|---|---|
| SKU | QDD-400G-VSR4-AO |
| Compatible OEM | Arista Networks® |
| Form Factor | QSFP-DD |
| Data Rate | 400GBase-SR4 |
| Modulation | PAM4 |
| Wavelength | 850nm |
| Fiber Type | Multi-Mode Fiber (MMF) |
| Connector | MPO-12 |
| Max Reach | 50m |
| Optical Interface | 53.125 GBd PAM4, 4-channel |
| Electrical Interface | 26.5625 GBd PAM4, 8-channel AUI-8 C2M |
| Operating Temperature | 0°C to 70°C |
| Power Dissipation | 8W (Typ.) |
| Supply Voltage | 3.135V – 3.465V |
| DOM Support | Yes |
| Hot Swappable | Yes |
| CMIS Support | Rev. 4.0 |
| Compliance Standards | IEEE 802.3ck, IEEE 802.3db, QSFP-DD MSA |
| TAA Compliant | Yes |
| RoHS Compliant | Yes |
| Applications | 400G Ethernet, Datacenter Switches, Cloud Infrastructure |
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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
