• Silver-colored arista H-D400-4Q100-1M sfp+ transceiver modules with blue handles and metallic connectors for 400g active DAC
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Arista

Arista QDD-800G-2XDR4-Arista | 800G QSFP-DD Transceiver, 2x 400G XDR4, 1310nm, 2km SMF

QDD-800G-2XDR4-Arista

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Description

The Arista QDD-800G-2XDR4 is an 800 Gigabit QSFP-DD optical transceiver designed for high-performance data center and AI/ML infrastructure deployments. Supporting 2x 400G-XDR4 or 8x 100G-FR breakout configurations, this module delivers 800Gbps aggregate throughput over 2km single-mode fiber via dual MPO-12 APC connectors at 1310nm wavelength. Built with PAM4 modulation and compliant with QSFP-DD MSA and IEEE 802.3cu standards, it enables seamless 800G-to-400G interoperability without breakout cables.

Features

8x 100Gb/s PAM4 electrical and optical lanes for 800Gbps aggregate throughput
- Dual independent 400G XDR4 channels with separate MPO-12 connectors
- Native breakout support: 2x 400G-XDR4 or 8x 100GBASE-FR without external cables
- Digital Diagnostics Monitoring (DDM) for real-time parameter tracking including optical power, temperature, bias current, and supply voltage
- Hot-pluggable QSFP-DD form factor with integrated heatsink contact
- Compliant with QSFP-DD MSA Hardware Rev 7.0 and CMIS Rev 5.0 specifications
- IEEE 802.3cu-2021 compliant for 8x100GBASE-FR1 optical interface
- RoHS compliant (EU Directive 2011/65/EU)
- Built-in Broadcom DSP chip for signal processing and optimization
- Backward compatible optical interoperability with 400G and 100G transceivers
- Low BER (Bit Error Rate) performance for high-reliability data transmission
- Suitable for AI cluster interconnects, data center spine-leaf architectures, and high-frequency trading networks

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: 800Gbps aggregate (2x 400G-XDR4 or 8x 100GBASE-FR)
- Wavelength: 1310nm
- Maximum Transmission Distance: 2km over single-mode fiber (SMF)
- Connector Type: Dual MPO-12 APC connectors
- Modulation: PAM4 (Pulse Amplitude Modulation 4-level)
- Electrical Interface: 8x 100Gb/s PAM4 lanes
- Optical Interface: 8x 106.25Gb/s optical lanes
- Power Consumption: Typical 16W
- Operating Temperature: Commercial (0°C to 70°C)
- Compliance: QSFP-DD MSA, CMIS Rev 5.0, IEEE 802.3cu-2021
- Digital Diagnostics Monitoring: DDM supported
- Interoperability: Compatible with 2x 400G-XDR4 OSFP/QSFP-DD and 8x 100G-FR QSFP transceivers

FAQs

Q: What breakout configurations does the QDD-800G-2XDR4 support?
A: This transceiver supports 2x 400GBASE-XDR4 breakout using dual MPO-12 connectors, allowing connection to two separate 400G XDR4 modules without breakout cables. It also supports 8x 100GBASE-FR breakout for connecting to eight 100G QSFP modules, providing flexible deployment options for evolving data center architectures.

Q: Is this module compatible with OSFP form factor transceivers?
A: Yes, the QDD-800G-2XDR4 QSFP-DD transceiver is optically interoperable with OSFP-800G-2XDR4 modules for 800G connections and with 2x 400G-XDR4 OSFP transceivers. Both form factors use the same optical specifications at 1310nm wavelength over single-mode fiber, ensuring seamless cross-platform compatibility.

Q: What Arista switch platforms support this 800G transceiver?
A: The QDD-800G-2XDR4 is designed for Arista's 800G-capable switches with QSFP-DD ports, including platforms from the 7800R4 and 7700R4 series. Consult Arista's Transceiver and Cable Guide for specific platform compatibility, as 800G support requires hardware with 8x 100G electrical lanes and appropriate cooling for the 16W power envelope.

Q: Can I connect only one MPO-12 port for a 400G link?
A: Yes, each MPO-12 port operates as an independent 400G DR4 channel. You can connect just one port to achieve a single 400G link, though the aggregate throughput will be limited to 400Gbps rather than the full 800Gbps. This provides deployment flexibility for incremental bandwidth upgrades.

Q: What are the key advantages of 800G transceivers over 400G?
A: 800G transceivers double bandwidth density from 12.8Tbps to 25.6Tbps per rack unit in 32-port systems, significantly reducing cost per gigabit and power consumption per bit. They are essential for AI/ML workloads, high-performance computing clusters, and hyperscale data centers requiring maximum throughput with minimal physical footprint and optimized total cost of ownership.

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