• Silver-colored Arista QDD-800G-2FR4 QSFP-DD transceiver modules with blue handles and metallic connectors for 800G networking
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Arista

Arista QDD-800G-2FR4 | 800G QSFP-DD Transceiver, 2x400G-FR4, 2km SMF

QDD-800G-2FR4

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Description

The Arista 800G QSFP-DD 2FR4 transceiver combines two 400GBASE-FR4 links in a single QSFP-DD module, delivering 800G aggregate over two duplex LC single-mode fibre connections. It suits data centre operators building high-density 800G switch-to-switch links, spine-leaf fabrics and AI cluster interconnects, and each half can run as an independent 400G-FR4 link for 800G to 2x 400G breakout.

Optically, the module is 800GBASE-2FR4 with two duplex LC connectors, one per 400G link, and reaches up to 2km over G.652 single-mode fibre. Each lane group uses the standard 400GBASE-FR4 wavelengths of 1271, 1291, 1311 and 1331 nm. Transmit power is -3.3 to +3.5 dBm per lane and receive power is -7.3 to +3.5 dBm per lane. Maximum power consumption is 16W, with an operating case temperature of 0 to 70 C.

The module fits QSFP-DD ports on Arista 800G platforms, and Arista's Transceiver and Cable Guide lists the supported platforms. The OSFP equivalent is OSFP-800G-2FR4.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Dual 400GBASE-FR4 in a single QSFP-DD module for high-density 800G ports
- Up to 2km over duplex single-mode fibre
- Two duplex LC connectors, one per 400G link
- Each half operates as a standards-based 400GBASE-FR4 link
- Supports 800G to 2x 400G breakout deployments
- Part of Arista's 800G QSFP-DD optics portfolio alongside 2XDR4, 2PLR4 and 2LR4 options

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
- PHY type: 800GBASE-2FR4 (2x 400GBASE-FR4)
- Connectors: 2x duplex LC
- Cable type: Single-mode fibre (SMF G.652)
- Maximum reach: 2km
- Wavelengths: 1271, 1291, 1311, 1331 nm
- Tx power: -3.3 to +3.5 dBm per lane
- Rx power: -7.3 to +3.5 dBm per lane
- Maximum power consumption: 16W
- Dimensions QSFP-DD Type 1 (H x W x D): 13.5 x 18.4 x 78.3 mm
- Dimensions QSFP-DD Type 2 (H x W x D): 13.5 x 18.4 x 93.3 mm
- Operating case temperature: 0 to 70 C
- Storage temperature: -40 to 70 C
- Relative humidity: 5 to 95%
- Operating altitude: 0 to 10,000 ft

FAQs

Q: Can the two 400G links be used independently?
A: Yes. Each half is a standards-based 400GBASE-FR4 link on its own duplex LC connector, so the module can serve as two independent 400G-FR4 links.

Q: What fibre and reach does this transceiver support?
A: It uses duplex G.652 single-mode fibre with two LC connectors and reaches up to 2km.

Q: Which ports does it fit?
A: It fits QSFP-DD ports on Arista 800G platforms. Check Arista's Transceiver and Cable Guide for the supported platforms.

Q: Is there an OSFP version of this transceiver?
A: Yes. The OSFP equivalent is OSFP-800G-2FR4, which uses the same 2x 400GBASE-FR4 optics in an OSFP form factor.

Q: How much power does the module draw?
A: Maximum power consumption is 16W, so the host switch needs to provide enough thermal and power headroom per QSFP-DD port.

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