• 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-400G-LR8-Arista | 400G QSFP-DD Transceiver, 8x 50G PAM4, 1310nm, 10km

QDD-400G-LR8-Arista

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Description

The Arista QDD-400G-LR8 is a high-performance 400GBASE-LR8 QSFP-DD optical transceiver designed for data center and enterprise network applications requiring long-reach connectivity. It delivers 400Gbps throughput over duplex single-mode fiber at distances up to 10km using eight wavelengths at 1310nm with PAM4 modulation. Fully compliant with IEEE 802.3bs, QSFP-DD MSA, and 400GAUI-8 standards, this module features integrated DDM for real-time performance monitoring and supports duplex LC connectivity.

Features

400GBASE-LR8 compliant for high-speed data center interconnects
- Eight independent 53.125 Gbps PAM4 transmit and receive channels
- Integrated wavelength multiplexing and demultiplexing within the module
- Hot-pluggable QSFP-DD form factor for easy installation and maintenance
- Full-duplex operation with duplex LC optical interface
- Real-time digital diagnostics monitoring (DDM/DOM) capabilities
- Compliant with QSFP-DD Multi-Source Agreement (MSA) Type 2
- IEEE 802.3bs 400GBASE-LR8 and 400GAUI-8 / CEI-56G-VSR-PAM4 standards compliance
- Supports up to 10km transmission over standard G.652 single-mode fiber
- PAM4 modulation for efficient high-speed data transmission
- Integrated DSP chip for signal processing and performance optimization
- RoHS compliant design for environmental responsibility

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: 400Gbps aggregate (8x 53.125 Gbps PAM4 per wavelength)
- Wavelength: 1310nm
- Transmission Distance: Up to 10km over duplex single-mode fiber (SMF)
- Connector Type: Duplex LC
- Electrical Interface: 76-pin edge type connector (MSA compliant)
- Standards Compliance: IEEE 802.3bs 400GBASE-LR8, IEEE 802.3 400GAUI-8, QSFP-DD MSA Type 2
- Modulation: PAM4 (Pulse Amplitude Modulation 4-level)
- Digital Diagnostics: DDM/DOM support via I2C interface for real-time monitoring
- FEC: Requires host-side Forward Error Correction
- Power Consumption: 14W typical
- Operating Temperature: Commercial grade (0°C to 70°C typical)

FAQs

Q: What is the maximum transmission distance for the QDD-400G-LR8?
A: The QDD-400G-LR8 supports transmission distances up to 10km over duplex single-mode fiber (SMF) with Forward Error Correction (FEC) enabled on the host platform.

Q: Is this transceiver compatible with OSFP ports?
A: No, QSFP-DD and OSFP are different form factors and are not mechanically compatible. The QDD-400G-LR8 is designed exclusively for QSFP-DD ports and cannot be used in OSFP ports.

Q: What fiber type is required for this transceiver?
A: The QDD-400G-LR8 requires G.652 standard single-mode fiber (SMF) with duplex LC connectors. The actual transmission distance depends on fiber quality, insertion loss, and link budget.

Q: Does this module include Digital Diagnostics Monitoring?
A: Yes, the QDD-400G-LR8 includes DDM/DOM support via I2C interface, allowing real-time monitoring of optical output power, receive power, temperature, transmit bias current, and supply voltage.

Q: What is the difference between 400G-LR8 and 400G-LR4?
A: The LR8 uses 8 channels of 50G each (8x50G) on the optical path, while the LR4 uses 4 channels of 100G each (4x100G). This results in differences in laser count, power consumption, and cost, though both achieve 10km reach.

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