• Silver-colored arista qdd-400g-lr4 sfp+ transceiver modules with blue handles and metallic connectors for 10km use
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Arista

Arista QDD-400G-LR4 | 400G QSFP-DD Transceiver, Single-Mode, 10km, LC

QDD-400G-LR4

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Description

The Arista QDD-400G-LR4 is a high-performance 400GBASE-LR4 QSFP-DD optical transceiver designed for data center and enterprise applications requiring long-reach connectivity. It delivers 400 Gigabit Ethernet throughput over single-mode fiber up to 10 kilometers using four CWDM4 wavelengths and PAM4 modulation. Compliant with IEEE 802.3bs, QSFP-DD MSA, and OIF 56G PAM4 standards, this module features digital diagnostics monitoring and a duplex LC connector interface.

Features

IEEE 802.3bs 400GBASE-LR4 compliant for standardized Ethernet connectivity
- QSFP-DD MSA form factor for high port density in data center switches
- Four independent CWDM4 optical channels at 1271/1291/1311/1331nm wavelengths
- PAM4 (4-level Pulse Amplitude Modulation) encoding for efficient high-speed signaling
- Electrical interface: 8 lanes at 50 Gbps per lane with PAM4 modulation
- Optical interface: 4 lanes at 100 Gbps per lane via multiplexing and demultiplexing
- Hot-pluggable operation for easy installation and replacement without downtime
- Digital Diagnostics Monitoring (DDM/DOM) for real-time performance tracking including temperature, optical power, voltage, and bias current
- Duplex LC connector for standard single-mode fiber connections
- Low power consumption (typically under 10W) suitable for high-density deployments
- Integrated FEC and DSP gearbox for signal integrity and error correction
- EML (Electro-absorption Modulated Laser) transmitters for long-distance performance
- 2-wire serial interface (I2C/TWI) for management and configuration
- RoHS compliant and meets safety certifications (CE, FCC)
- Suitable for data center interconnect (DCI), campus backbone, and high-performance computing applications

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: 400 Gbps
- Reach: Up to 10 km over single-mode fiber (SMF)
- Wavelengths: 1271nm, 1291nm, 1311nm, 1331nm (CWDM4)
- Connector Type: Duplex LC/UPC or LC/PC
- Electrical Interface: 8 channels of 50 Gb/s PAM4 (400GAUI-8)
- Optical Interface: 4 channels of 100 Gb/s PAM4
- Compliance: IEEE 802.3bs 400GBASE-LR4, QSFP-DD MSA, OIF 56G PAM4, 100G Lambda MSA
- Power Supply: Single +3.3V
- Power Consumption: Typically less than 10W (varies by manufacturer)
- Operating Temperature: 0°C to 70°C (standard commercial grade)
- Digital Diagnostics: DOM/DDM support via 2-wire I2C interface
- Forward Error Correction (FEC): Supported
- Hot-Pluggable: Yes

FAQs

Q: What is the maximum transmission distance for the QDD-400G-LR4?
A: The QDD-400G-LR4 supports transmission distances up to 10 kilometers over single-mode fiber. While compliant with IEEE 802.3cu for 400GBASE-LR4-6km requirements, it extends reach to 10km. Actual distance depends on optical link budget, fiber quality, and connector losses.

Q: Is this transceiver compatible with other vendors' equipment?
A: Yes, the QDD-400G-LR4 follows industry-standard specifications including IEEE 802.3bs and QSFP-DD MSA, enabling interoperability with other vendors' 400G QSFP-DD ports and switches. The optical interface is vendor-agnostic when following the same standards.

Q: Can the QDD-400G-LR4 be used in breakout configurations?
A: The QDD-400G-LR4 is designed as a single 400G channel transceiver with four optical wavelengths multiplexed over duplex LC connectors. It does not support native breakout to lower-speed connections like 4x100G. For breakout applications, consider DR4, FR4, or SR8 variants with MPO connectors.

Q: What is the difference between QDD-400G-LR4 and QDD-400G-FR4?
A: The LR4 variant supports up to 10km reach over single-mode fiber, while the FR4 supports up to 2km. Both use four CWDM4 wavelengths and duplex LC connectors, but LR4 employs higher-power transmitters and more sensitive receivers for extended distance.

Q: Does this module require Forward Error Correction?
A: Yes, the QDD-400G-LR4 is designed to operate with host-side FEC (Forward Error Correction) to ensure reliable 400G transmission over 10km distances. The module is compliant with IEEE 802.3bs FEC requirements for 400GBASE-LR4.

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