• 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-SR8-C-Arista | 400G QSFP-DD Transceiver, Multi-Mode, 850nm, 100m

QDD-400G-SR8-C-Arista

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Description

The Arista QDD-400G-SR8-C is a 400GBase-SR8 QSFP-DD transceiver designed for high-performance data center and enterprise network deployments. It delivers 400Gbps throughput over multi-mode fiber up to 100m using eight parallel optical channels at 850nm via an MPO-16 connector. This channelized module supports breakout configurations for flexible network architectures and is compliant with IEEE 802.3bs and QSFP-DD MSA standards.

Features

400GBase-SR8 parallel optics with 8 lanes at 50Gbps each
- PAM4 modulation for high-speed data transmission
- Channelized configuration support: 8x 50G-SR or 8x 25G-SR breakout
- Breakout to 2x 200G-SR4 for flexible topology design
- IEEE 802.3bs and QSFP-DD MSA compliant
- Hot-swappable for zero-downtime maintenance
- Digital Diagnostics Monitoring (DDM/DOM) for real-time optical health monitoring
- Low power consumption for energy-efficient operation
- MPO-16 APC connector for multi-mode fiber
- VCSEL laser technology at 850nm wavelength
- Commercial temperature range operation (0°C to 70°C)
- RoHS and CE certified
- Backward compatible with 100G and 200G breakout configurations
- Suitable for data center interconnect, ISP aggregation, 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 (QSFP56-DD)
- Data Rate: 400Gbps (8 x 50Gbps per lane)
- Wavelength: 850nm VCSEL
- Connector: MPO-16 / MTP-16 APC
- Max Distance: 100m over OM4 MMF, 70m over OM3 MMF
- Modulation: PAM4
- Channels: 8 independent transmit and receive channels
- Breakout Support: 8x 50G-SR, 8x 25G-SR, 2x 200G-SR4
- Power Consumption: <12W (typical for QSFP-DD modules)
- Operating Temperature: 0°C to 70°C (commercial)
- Digital Diagnostics: DOM/DDM supported
- Standards Compliance: IEEE 802.3bs, QSFP-DD MSA, 400GAUI-8/CEI-56G-VSR-PAM4
- Electrical Interface: 8 x 50Gbps PAM-4 (60-pin edge connector)
- Hot-Swappable: Yes

FAQs

Q: What is the difference between QDD-400G-SR8 and QDD-400G-SR8-C?
A: The QDD-400G-SR8-C is a channelized variant that includes all functionality of the standard SR8 transceiver, plus the ability to be software-configured as 8x 50G-SR or 8x 25G-SR breakouts, offering greater deployment flexibility for different network topologies.

Q: What fiber types are compatible with this transceiver?
A: This transceiver supports multi-mode fiber, achieving up to 100m over OM4 or OM5 fiber and approximately 70m over OM3 fiber. It uses an MPO-16 connector for parallel optics transmission.

Q: Can this module be used in OSFP form factor switches?
A: No, QSFP-DD and OSFP are distinct physical form factors and are not interchangeable. This QSFP-DD module must be used in QSFP-DD ports only. However, it will interoperate optically with OSFP transceivers using the same 400GBase-SR8 standard over compatible fiber.

Q: Is this transceiver suitable for data center spine-leaf architectures?
A: Yes, the QDD-400G-SR8-C is ideal for high-density data center deployments, supporting 400G uplinks and enabling flexible breakout to 8x 50G or 2x 200G connections for scalable leaf-spine and top-of-rack configurations.

Q: Does this module support Digital Optical Monitoring?
A: Yes, this transceiver includes DDM/DOM functionality, providing real-time diagnostic data including optical output power, receive power, temperature, transmit bias current, and supply voltage for proactive network monitoring and troubleshooting.

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