• Silver-colored arista qdd-400g-vsr4 400g qsfp-dd transceiver modules with blue handles and metallic connectors
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Arista

Arista QDD-400G-VSR4 | 400G QSFP-DD Transceiver, Multi-Mode, 850nm, 50m, MPO-12

QDD-400G-VSR4

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Description

The Arista QDD-400G-VSR4 is a high-performance 400GBASE-VSR4 QSFP-DD transceiver designed for data center and high-performance computing environments requiring short-reach multi-mode connectivity. It delivers 400 Gigabit Ethernet throughput up to 50 meters over OM4 multi-mode fiber using an MPO-12 APC connector and 850nm wavelength. This hot-swappable module features PAM4 modulation technology, digital optical monitoring, and compliance with IEEE 802.3 and QSFP-DD MSA standards for seamless integration into modern switching infrastructure.

Features

400GBASE-VSR4 compliant with IEEE 802.3ck and 802.3db standards
- PAM4 modulation technology for efficient high-speed transmission
- 4 optical channels at 100 Gbps per lane (53.125 GBaud PAM4)
- Hot-pluggable QSFP-DD form factor for easy installation and maintenance
- Digital Optical Monitoring (DOM) for real-time performance tracking
- CMIS 4.0 management interface for advanced diagnostics and control
- Low EMI design with metal housing for superior electromagnetic shielding
- Enhanced ESD protection for reliable operation
- RoHS compliant and lead-free construction
- Compatible with standard QSFP-DD cages and host systems
- Supports breakout to 4x 100GBASE-SR for flexible network architectures
- Commercial temperature range (0°C to 70°C) for data center environments
- MPO-12 APC connector for optimal optical performance and low insertion loss

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

Form Factor: QSFP-DD (Quad Small Form-factor Pluggable Double Density)
- Data Rate: 400 Gbps (400GBASE-VSR4)
- Wavelength: 850nm VCSEL
- Fiber Type: Multi-mode fiber (MMF)
- Maximum Distance: 50m over OM4 fiber
- Connector: MPO-12 APC (Angled Physical Contact)
- Modulation: PAM4 (Pulse Amplitude Modulation 4-level)
- Optical Lanes: 4 channels at 100G PAM4 per lane
- Electrical Interface: 400GAUI-8, 8 lanes at 53.125 GBaud PAM4
- Power Consumption: ≤12W maximum
- Operating Temperature: 0°C to 70°C (commercial temperature range)
- Digital Diagnostics: DOM (Digital Optical Monitoring) support
- Management Interface: CMIS 4.0 compliant
- Standards Compliance: IEEE 802.3ck, IEEE 802.3db, QSFP-DD MSA
- Hot-swappable and RoHS compliant

FAQs

Q: What is the maximum transmission distance for the QDD-400G-VSR4?
A: The QDD-400G-VSR4 supports link lengths up to 50 meters over OM4 multi-mode fiber. For OM3 fiber, the reach is typically 30 meters. The module uses an MPO-12 APC connector for parallel multi-mode fiber connectivity.

Q: Is this transceiver compatible with 100G breakout configurations?
A: Yes, the QDD-400G-VSR4 can support breakout configurations. It is designed to be interoperable with 100GBASE-SR optics in 4x 100G breakout mode, allowing a single 400G port to connect to four separate 100G links over parallel fiber.

Q: What switching platforms support the QDD-400G-VSR4?
A: This transceiver is designed for Arista switches with QSFP-DD ports, typically found in data center and campus switching platforms that support 400G connectivity. It is suitable for top-of-rack, spine, and aggregation layer deployments requiring high-bandwidth short-reach connectivity.

Q: Does this module require external Forward Error Correction?
A: FEC is typically performed on the host platform rather than within the transceiver itself. The module complies with IEEE 802.3 standards which may specify FEC requirements depending on the application and fiber type used.

Q: What is the difference between VSR4 and SR8 variants?
A: The VSR4 variant uses 4 optical lanes at 100G PAM4 per lane with an MPO-12 connector, supporting 50m over OM4 fiber. The SR8 variant uses 8 optical lanes at 50G PAM4 per lane with an MPO-16 connector, supporting 100m over OM4 and enabling different breakout options such as 8x 50G or 2x 200G.

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