• Silver-colored arista qdd-800g-2fr4 sfp+ transceiver modules with blue plastic handles and metallic connectors for 2km smf use
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Arista

Arista QDD-800G-2FR4 | 800G QSFP-DD 2x FR4 Transceiver, 2x LC Duplex, 2km SMF

Arista QDD-800G-2FR4 | 800G QSFP-DD 2x FR4 Transceiver, 2x LC Duplex, 2km SMF

QDD-800G-2FR4

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Description

The Arista QDD-800G-2FR4 is an 800G QSFP-DD transceiver designed to deliver two independent 400GBASE-FR4 channels over duplex single-mode fibre, supporting reaches of up to 2km per channel. Using two duplex LC connectors, this breakout-capable module is engineered for high-density data centre interconnects where 800G ports must be split into dual 400G links — ideal for spine-to-leaf cabling, core aggregation, and high-performance compute fabrics in modern AI and cloud infrastructure.

Compatible with Arista's 800G-capable platforms, this transceiver leverages FR4 optics (four wavelengths via coarse WDM) to achieve 400G per port over standard SMF without requiring specialised fibre infrastructure. It delivers the density and reach required for next-generation data centre deployments. Available now at iptrading.com.au — competitive prices and local support.

Features

- Dual 400GBASE-FR4 channels in a single 800G QSFP-DD form factor — doubles density on 800G-capable ports
- FR4 CWDM4 optics: four wavelengths per channel enable 400G over standard duplex SMF
- Up to 2km reach per channel — ideal for data centre inter-rack and inter-row deployments
- Two independent duplex LC connectors provide flexible patching to separate 400G endpoints
- Low power consumption typical of FR4 optics compared to LR4 alternatives
- Compatible with Arista's 800G switching platforms for seamless integration
- Supports high-density AI fabric, cloud core, and spine-to-leaf interconnect architectures
- No parallel MPO fibre required — uses standard duplex LC SMF cabling

Warranty

Arista hardware products come with a 1-year limited hardware warranty, covering defects in materials and workmanship under normal use.
Extended Warranty Options:
IP Trading offers tailored extended warranty solutions and support packages for Arista products. Contact our team to explore options that align with your organisation's needs.
https://www.arista.com/assets/data/pdf/Warranty.pdf

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

- Form factor: QSFP-DD (Double Density)
- Total data rate: 800G (2x 400GBASE-FR4)
- Per-channel rate: 400G (FR4 — 4x 100G lanes per channel)
- Connector: 2x duplex LC (one per 400G channel)
- Fibre type: Duplex Single-Mode Fibre (SMF)
- Maximum reach: Up to 2km per channel
- Wavelength technology: CWDM4 (4 wavelengths: ~1271, 1291, 1311, 1331 nm)
- Operating temperature: 0°C to 70°C (commercial)
- Interface standard: 400GBASE-FR4 (IEEE 802.3cu compliant per channel)
- Host interface: 800G QSFP-DD port
- Breakout mode: 2x 400G over dual LC duplex connectors

FAQs

Q: What does the QDD-800G-2FR4 actually do — is it a single 800G link or two 400G links?
A: It presents as a single 800G QSFP-DD module to the host switch but provides two independent 400GBASE-FR4 optical channels, each over a separate duplex LC connector. This makes it a breakout transceiver — one 800G port becomes two 400G links.

Q: What fibre infrastructure is required to use this transceiver?
A: The QDD-800G-2FR4 requires duplex single-mode fibre (SMF) for each of its two LC connectors. Standard OS2 SMF patch cables are compatible. No specialised or parallel fibre arrays are needed.

Q: What is the maximum supported reach?
A: Each 400GBASE-FR4 channel supports up to 2km over duplex SMF — suitable for inter-rack and inter-row connectivity within a data centre, or short campus links.

Q: Which Arista platforms support the QDD-800G-2FR4?
A: This transceiver is designed for Arista switches with native 800G QSFP-DD ports, such as those in the 7800R3 and next-generation 7700 series. Always confirm platform compatibility with your Arista documentation or contact IP Trading for guidance.

Q: Can I purchase this transceiver in Australia through IP Trading?
A: Yes — the Arista QDD-800G-2FR4 is available through iptrading.com.au. IP Trading offers competitive pricing, local Australian support, and fast fulfilment for B2B customers.

Q: What is the difference between FR4 and LR4 optics for 400G applications?
A: Both FR4 and LR4 use CWDM4 wavelengths over SMF, but LR4 supports up to 10km while FR4 is optimised for up to 2km at lower power consumption and cost. For data centre interconnects under 2km, FR4 is the preferred choice.

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