• Silver-colored arista qdd-400g-plr4-s 400g qsfp-dd single-mode transceiver modules with blue handles and metallic connectors
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Arista

Arista QDD-400G-PLR4-S | 400G QSFP-DD Transceiver, Single-Mode, 10km, MPO-12

QDD-400G-PLR4-S

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Description

The Arista QDD-400G-PLR4-S is a 400GBASE-PLR4 QSFP-DD optical transceiver designed for 400 Gigabit Ethernet transmission up to 10km over single-mode fiber. It supports 4x100G breakout connectivity to QSFP28 100G-LR modules and uses an MPO-12 APC connector with four parallel optical lanes. Ideal for high-density data center interconnects, enterprise campus backbones, and cloud network infrastructure requiring long-reach 400G connectivity.

Features

Hot-pluggable QSFP-DD form factor for easy installation and replacement
- Four parallel 100Gbps optical lanes using PAM4 modulation
- MPO-12 APC connector for parallel single-mode fiber transmission
- Supports 4x100GBASE-LR breakout for flexible network design
- Digital Optical Monitoring (DOM) with CMIS 4.0 management interface
- Compliant with QSFP-DD MSA, IEEE 802.3bs, and 100G Lambda MSA standards
- Low power consumption with maximum 12W thermal envelope
- RoHS compliant and meets international safety standards
- Operating temperature range: 0°C to 70°C for standard data center environments
- Link distance up to 10km over OS2 single-mode fiber
- Interoperates with 100G-LR QSFP28 modules in breakout configurations
- High-quality EML laser transmitter with PIN photodiode receiver

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 (4x 100G)
- Standard: 400GBASE-PLR4, IEEE 802.3bs, QSFP-DD MSA compliant
- Wavelength: 1310nm (four wavelengths: 1271, 1291, 1311, 1331 nm)
- Fiber Type: Single-Mode Fiber (SMF)
- Maximum Distance: 10km
- Connector: MPO-12 APC (12-fiber angled physical contact)
- Operating Temperature: 0°C to 70°C
- Power Consumption: Maximum 12W
- Modulation: PAM4 (Pulse Amplitude Modulation 4-level)
- Digital Diagnostics: DOM (Digital Optical Monitoring) / CMIS 4.0
- Optical Channels: 4 parallel lanes, 100Gbps per lane
- Breakout Support: 4x 100GBASE-LR interoperability

FAQs

Q: What is the difference between PLR4 and LR4 transceivers?
A: PLR4 uses four parallel fibers via an MPO-12 connector with one wavelength per fiber, while LR4 uses wavelength division multiplexing over a duplex LC connector with two fibers. Both support 10km reach over single-mode fiber, but PLR4 offers easier breakout to 4x100G-LR modules.

Q: Can this transceiver be used in breakout mode?
A: Yes, the QDD-400G-PLR4-S supports 4x100G breakout connectivity and interoperates with QSFP28 100G-LR transceivers. Each of the four 100Gbps lanes can be broken out to separate 100G connections using appropriate breakout cables.

Q: Is this transceiver compatible with Arista switches?
A: Yes, this module is designed specifically for Arista networking platforms and is coded to be recognized by Arista switches that support QSFP-DD 400G interfaces, including the 7060X, 7280R, and 7800R series.

Q: What type of fiber cable is required?
A: This transceiver requires single-mode fiber (SMF) OS2 cable with MPO-12 APC connectors. The APC (angled physical contact) connector is essential for proper operation and must be used instead of standard UPC connectors.

Q: Does this module support Digital Optical Monitoring?
A: Yes, the QDD-400G-PLR4-S includes Digital Optical Monitoring (DOM) support via CMIS 4.0, providing real-time access to operating parameters such as temperature, voltage, transmit/receive power, and laser bias current for each channel.

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