• Silver-colored arista qdd-400g-sr8-c 400g sr8 transceiver modules with blue handles and metallic mpo-16 connectors
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Arista

Arista QDD-400G-SR8-C | 400G SR8 Transceiver, MMF 850nm, 100m, MPO-16

QDD-400G-SR8-C

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Description

The Arista QDD-400G-SR8-C is a high-performance 400GBASE-SR8 QSFP-DD optical transceiver designed for short-reach data center interconnects. Operating at 850nm over multi-mode fiber with an MPO-16 connector, it supports transmission distances up to 100m on OM4 fiber. This channelized variant provides enhanced flexibility with breakout support for 400G, 2x200G-SR4, 8x50G-SR, or 8x25G-SR configurations, making it ideal for high-density spine-leaf architectures and AI cluster deployments.

Features

8-channel parallel optics with PAM4 modulation for 400Gbps aggregate throughput
- MPO-16 APC connector for 8 pairs of multi-mode fiber
- Hot-pluggable QSFP-DD form factor with backward compatibility to QSFP ports (at reduced speeds)
- Channelized breakout support: 400G-SR8, 2x200G-SR4, 8x50G-SR, 8x25G-SR
- VCSEL (Vertical-Cavity Surface-Emitting Laser) technology at 850nm
- Digital Diagnostics Monitoring (DDM/DOM) for real-time performance monitoring
- IEEE 802.3bs 400GBASE-SR8 and QSFP-DD MSA compliant
- Low power consumption design for high-density deployments
- RoHS and CE certified for environmental and safety compliance
- Commercial temperature range (0°C to 70°C) for standard data center environments
- Supports 400GAUI-8 and CEI-56G-VSR-PAM4 electrical interfaces
- Ideal for spine-leaf topologies, AI cluster interconnects, and high-performance computing

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 (8 x 50Gbps PAM4)
- Wavelength: 850nm VCSEL
- Connector: MPO-16 APC
- Fiber Type: Multi-Mode Fiber (MMF)
- Transmission Distance: Up to 70m over OM3, 100m over OM4/OM5
- Modulation: PAM4 (Pulse Amplitude Modulation 4-level)
- Electrical Interface: 400GAUI-8 / CEI-56G-VSR-PAM4
- Breakout Support: 400G-SR8, 2x200G-SR4, 8x50G-SR, 8x25G-SR (Channelized)
- Digital Diagnostics: DDM/DOM (Digital Diagnostics Monitoring)
- Operating Temperature: 0°C to 70°C (Commercial)
- Power Consumption: Typically <10W
- Compliance: IEEE 802.3bs 400GBASE-SR8, QSFP-DD MSA, RoHS, CE

FAQs

Q: What is the difference between QDD-400G-SR8 and QDD-400G-SR8-C?
A: The QDD-400G-SR8-C is the channelized version, offering all the functionality of the standard SR8 plus the ability to configure as 8x50G-SR or 8x25G-SR breakout modes. The standard SR8 supports 400G, 2x200G-SR4, and 2x100G-SR4 breakouts only.

Q: What cabling is required for this transceiver?
A: This module requires MPO-16 APC multi-mode fiber cabling. For 400G point-to-point links, use direct MPO-16 to MPO-16 cables. For breakout configurations, use MPO-16 to 2x MPO-8 or 8x LC fanout cables with OM3, OM4, or OM5 fiber.

Q: Is this transceiver compatible with other vendor equipment?
A: Yes, when properly coded. The QDD-400G-SR8-C follows IEEE 400GBASE-SR8 and QSFP-DD MSA standards, enabling interoperability with standards-compliant 400G switches and NICs from multiple vendors, including Arista, Cisco, Juniper, and others.

Q: Can this module be used for 200G or 100G connections?
A: Yes. The SR8-C supports flexible breakout configurations including 2x200G-SR4 and up to 8x50G-SR or 8x25G-SR, making it ideal for connecting legacy 200G or lower-speed equipment while maintaining upgrade paths to full 400G bandwidth.

Q: Does this transceiver require host FEC?
A: Yes, Forward Error Correction (FEC) is performed on the host platform to ensure reliable transmission at 400Gbps over the specified distances. Ensure your switch or NIC supports appropriate FEC modes for 400G operation.

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