• Silver-colored Arista QDD-800G-2FR4 QSFP-DD transceiver modules with blue handles and metallic connectors for 800G networking
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Arista

Arista QDD-800G-2FR4 | 800G QSFP-DD Transceiver, 2x400G-FR4, 1310nm, 2km SMF

QDD-800G-2FR4

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Description

The Arista QDD-800G-2FR4 is an 800GBASE-2FR4 QSFP-DD optical transceiver designed for high-performance data center applications requiring up to 2km reach over single-mode fiber. Supporting 8x 106.25Gbps PAM4 modulation with dual duplex CS connectors, this module enables 800G Ethernet or flexible breakout to 2x 400GBASE-FR4 without additional cables. Compliant with IEEE 802.3cu-2021, IEEE P802.3ck, QSFP-DD MSA, and CMIS 5.0 standards, it delivers reliable performance for spine-leaf architectures, top-of-rack switch links, and AI-driven cloud infrastructure.

Features

8-channel 106.25Gbps PAM4 modulation for 800G Ethernet throughput
- Dual duplex CS connector design enabling 2x 400G breakout without additional cables
- CWDM4 wavelength multiplexing (1271, 1291, 1311, 1331nm) for efficient spectral use
- Supports up to 2km transmission over OS2 single-mode fiber
- IEEE 802.3cu-2021 and IEEE P802.3ck compliant for 800GBASE-2FR4 and 2x400GBASE-FR4
- QSFP-DD MSA hardware revision 6.01 Type 2A with dual CS connector support
- CMIS 5.0 management interface for advanced diagnostics and monitoring
- Digital diagnostics monitoring (DDM) for real-time temperature, voltage, bias current, and optical power
- Forward Error Correction (FEC) support for enhanced signal integrity
- Low power consumption (≤18W maximum) for energy-efficient operations
- Commercial temperature range (0°C to 70°C) for standard data center environments
- Hot-pluggable design for simplified installation and maintenance
- EML laser technology with PIN photodetector for reliable optical performance
- Class 1 laser safety rating per IEC 60825-1
- Interoperable with 400GBASE-FR4 modules for flexible network design

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 (8x 106.25Gbps PAM4)
- Wavelengths: 1271nm, 1291nm, 1311nm, 1331nm (CWDM4)
- Maximum Reach: 2km over OS2 single-mode fiber (SMF)
- Connector Type: Dual duplex CS (can interface with LC via adapter)
- Electrical Interface: 8x 106.25Gbps PAM4 / 2x400GAUI-4 C2M
- Power Consumption: Maximum 16W typical (≤18W max per some sources)
- Operating Temperature: 0°C to 70°C (commercial temperature range)
- Digital Diagnostics: DDM/DOM supported per CMIS 5.0
- Compliance: IEEE 802.3cu-2021, IEEE P802.3ck, QSFP-DD MSA HW Rev 6.01, CMIS Rev 5.0
- Application Support: 800G Ethernet, 2x 400GBASE-FR4 breakout
- Laser Type: EML (Electro-absorption Modulated Laser) + PIN photodetector

FAQs

Q: What is the difference between the QDD-800G-2FR4 and standard 400G FR4 transceivers?
A: The QDD-800G-2FR4 supports 800Gbps throughput and features dual CS duplex connectors, enabling it to function as either a single 800G interface or breakout to two independent 400GBASE-FR4 links without requiring breakout cables. Each CS connector can independently connect to a separate 400G FR4 module over single-mode fiber.

Q: Can this transceiver be used for 400G applications?
A: Yes, the QDD-800G-2FR4 supports flexible breakout configurations. It can operate as 2x 400GBASE-FR4, with each port independently supporting 400G data rates over 2km single-mode fiber links. This makes it ideal for gradual migration from 400G to 800G infrastructure.

Q: What type of fiber and connectors are required for this module?
A: This module requires OS2 single-mode fiber (SMF) and uses dual duplex CS connectors. CS connectors can interface with standard LC connectors using CS-to-LC adapters or patch cables, ensuring compatibility with existing fiber infrastructure.

Q: Is this transceiver compatible with switches from other vendors?
A: While this SKU is specified for Arista Networks platforms, 800GBASE-2FR4 QSFP-DD transceivers following IEEE 802.3cu and QSFP-DD MSA standards are typically interoperable across multi-vendor environments. Always verify compatibility with your specific switch model and software version before deployment.

Q: What are typical use cases for 800G 2FR4 transceivers?
A: Common applications include spine-leaf data center architectures, high-performance computing clusters, AI training infrastructure, cloud data centers requiring high-bandwidth interconnects, and top-of-rack switches connecting to servers with 800G NICs or storage subsystems.

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