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Arista QDD-800G-2FR4 2 × 400GBASE-FR4 QSFP-DD 1271-1331nm 2 km SMF
800 Gbps 2 × 400GBASE-FR4 QSFP-DD transceiver, 1271–1331 nm (4 lambda CWDM), up to 2 km SMF, 0 to 70 °C case temperature.
- Manufacturer
- Arista Networks, Inc.
- Mfr part number
- QDD-800G-2FR4
- Series
- 800G QSFP-DD
- Category
- Fiber optic transceiver modules
- Datasheet
- QDD-800G-2FR4 datasheet (PDF)
QDD-800G-2FR4 specifications
| Attribute | Value |
|---|---|
| Part Number | QDD-800G-2FR4 |
| Manufacturer | Arista Networks, Inc. |
| Brand | Arista Networks |
| Standard | 2 × 400GBASE-FR4 |
| Form Factor | QSFP-DD, hot-swappable |
| Data Rate | 800 Gbps |
| Wavelength | 1271–1331 nm (4 lambda CWDM) |
| Media | 2 pairs duplex single-mode |
| Max Distance | 2 km SMF |
| Connector | 2 × duplex LC |
| Tx Power | −3.3 to +3.5 dBm/lane |
| Rx Power | −7.3 to +3.5 dBm/lane |
| Breakout | 2 × 400G-FR4 |
| Max Power | 16 W |
| Case Temp | 0 °C to 70 °C |
| Dimensions | 13.5 × 18.4 × 78.3–93.3 mm |
| Compliance | IEEE 802.3, QSFP-DD MSA |
| Reach detail | 2 km over two pairs of duplex single-mode fiber (interoperates with 2 × 400G-FR4) |
All values are from Arista Networks' published Optics Modules and Cables data sheet (Sep 2026). Confirm platform support for your switch with us before ordering.
About the Arista QDD-800G-2FR4
The Arista QDD-800G-2FR4 is a hot-swappable QSFP-DD 2 × 400GBASE-FR4 optical transceiver for 800 Gbps Ethernet over 2 pairs duplex single-mode, with a 2 × duplex LC interface and reach of up to 2 km SMF. It also supports breakout to 2 × 400G-FR4. Typical uses: 800G AI/ML back-end fabrics, hyperscale spine layers and 2 × 400G / 8 × 100G breakout.
- 800 Gbps 2 × 400GBASE-FR4 up to 2 km SMF
- Breakout: 2 × 400G-FR4
- 800G in a single QSFP-DD port
- 2 × duplex LC connector · 2 pairs duplex single-mode
- Genuine Arista optic · GST invoice · pan-India dispatch
QDD-800G-2FR4: frequently asked questions
What is the Arista QDD-800G-2FR4?
The Arista QDD-800G-2FR4 is a QSFP-DD 2 × 400GBASE-FR4 module from Arista Networks for 800 Gbps links. It plugs into a QSFP-DD port on an Arista switch and is used for 800G AI/ML back-end fabrics, hyperscale spine layers and 2 × 400G / 8 × 100G breakout.
What is the maximum distance of the QDD-800G-2FR4?
Arista specifies the QDD-800G-2FR4 for 2 km over two pairs of duplex single-mode fiber (interoperates with 2 × 400G-FR4).
What are the transmit and receive power levels of the QDD-800G-2FR4?
Per Arista's published optics data sheet, the QDD-800G-2FR4 transmits −3.3 to +3.5 dBm/lane and receives −7.3 to +3.5 dBm/lane.
Which fiber and connector does the QDD-800G-2FR4 need?
The QDD-800G-2FR4 uses a 2 × duplex LC connector on 2 pairs duplex single-mode, at 1271–1331 nm (4 lambda CWDM). Both ends of the link must use the same optical standard.
Is the QDD-800G-2FR4 compatible with my Arista switch?
It works in Arista switches with QSFP-DD ports that support this optic. Send us your switch model and EOS version and we will check it against Arista's Transceiver and Cable Guide before dispatch, so you only receive a module that works in your port.
OSFP vs QSFP-DD: which 800G version do I need?
Pick the form factor that matches your Arista switch port. Arista offers 800G platforms in both OSFP and QSFP-DD variants; modules with the same optical standard interoperate over the fibre, but are not mechanically interchangeable.
Does the QDD-800G-2FR4 support breakout?
Yes. Arista lists breakout to 2 × 400G-FR4. Use the matching optics at the far end and a suitable breakout cable or patch panel.
Is your QDD-800G-2FR4 genuine Arista?
Yes. Next Gen Networks supplies original Arista Networks optics, not third-party lookalikes or grey-market stock. Every unit is checked before dispatch, and we share the serial numbers on request so you can verify them in EOS ('show inventory').
What is the QDD-800G-2FR4 price in India and how do I order?
The Arista QDD-800G-2FR4 price in India depends on quantity, delivery city and current stock. Next Gen Networks supplies it with a GST invoice (input tax credit ready) and pan-India dispatch from New Delhi. Send the part number, quantity and delivery city on WhatsApp +91-7827955775 or email Sales@nextgennetworks.in and we reply with a GST quote.
How much power does the QDD-800G-2FR4 draw?
Arista lists maximum power of 16 W for the QDD-800G-2FR4. Check your switch's per-port power budget for dense deployments.
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Arista family datasheet
Related Arista parts
OSFP-800G-2XDR42 × 400GBASE-XDR4 / 8 × 100G-FR, 2 km SMFOSFP-800G-2PLR42 × 400GBASE-PLR4 / 8 × 100G-LR, 10 km SMFOSFP-800G-2FR42 × 400GBASE-FR4, 2 km SMFOSFP-800G-2LR42 × 400GBASE-LR4, 10 km SMFOSFP-800G-2VSR42 × 400GBASE-VSR4, 30 m OM3 / 50 m OM4OSFP-800G-VSR8800GBASE-VSR8, 30 m OM3 / 50 m OM4Government, PSU and enterprise orders welcome. GST invoice and pan-India delivery.
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