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Arista QDD-400G-LR8 400GBASE-LR8 QSFP-DD 1274-1309nm 10 km SMF
400 Gbps 400GBASE-LR8 QSFP-DD transceiver, 1274–1309 nm (8 lambda LAN-WDM), up to 10 km SMF, 0 to 70 °C case temperature.
- Manufacturer
- Arista Networks, Inc.
- Mfr part number
- QDD-400G-LR8
- Series
- 400G QSFP-DD
- Category
- Fiber optic transceiver modules
- Datasheet
- QDD-400G-LR8 datasheet (PDF)
QDD-400G-LR8 specifications
| Attribute | Value |
|---|---|
| Part Number | QDD-400G-LR8 |
| Manufacturer | Arista Networks, Inc. |
| Brand | Arista Networks |
| Standard | 400GBASE-LR8 |
| Form Factor | QSFP-DD, hot-swappable |
| Data Rate | 400 Gbps |
| Wavelength | 1274–1309 nm (8 lambda LAN-WDM) |
| Media | Duplex single-mode (G.652) |
| Max Distance | 10 km SMF |
| Connector | Duplex LC |
| Tx Power | −2.8 to +5.3 dBm/lane |
| Rx Power | −9.1 to +5.3 dBm/lane |
| Max Power | 14 W |
| Case Temp | 0 °C to 70 °C |
| Dimensions | 13.5 × 18.4 × 78.3–93.3 mm |
| Reach detail | 10 km on duplex single-mode fiber |
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-400G-LR8
The Arista QDD-400G-LR8 is a hot-swappable QSFP-DD 400GBASE-LR8 optical transceiver for 400 Gbps Ethernet over duplex single-mode (G.652), with a Duplex LC interface and reach of up to 10 km SMF. Typical uses: 400G spine and super-spine fabrics, AI/ML clusters, 4 × 100G breakout and data-centre interconnect.
- 400 Gbps 400GBASE-LR8 up to 10 km SMF
- IEEE 400GBASE-LR8, 8 × 50G lanes
- 10 km on duplex LC single-mode
- Duplex LC connector · Duplex single-mode (G.652)
- Genuine Arista optic · GST invoice · pan-India dispatch
QDD-400G-LR8: frequently asked questions
What is the Arista QDD-400G-LR8?
The Arista QDD-400G-LR8 is a QSFP-DD 400GBASE-LR8 module from Arista Networks for 400 Gbps links. It plugs into a QSFP-DD port on an Arista switch and is used for 400G spine and super-spine fabrics, AI/ML clusters, 4 × 100G breakout and data-centre interconnect.
What is the maximum distance of the QDD-400G-LR8?
Arista specifies the QDD-400G-LR8 for 10 km on duplex single-mode fiber.
What are the transmit and receive power levels of the QDD-400G-LR8?
Per Arista's published optics data sheet, the QDD-400G-LR8 transmits −2.8 to +5.3 dBm/lane and receives −9.1 to +5.3 dBm/lane.
Which fiber and connector does the QDD-400G-LR8 need?
The QDD-400G-LR8 uses a Duplex LC connector on duplex single-mode (G.652), at 1274–1309 nm (8 lambda LAN-WDM). Both ends of the link must use the same optical standard.
Is the QDD-400G-LR8 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 400G version do I need?
It depends only on your switch port. OSFP ports need OSFP optics and QSFP-DD ports need QSFP-DD optics; they are not mechanically interchangeable. If both ends run the same optical standard (e.g. DR4 to DR4), an OSFP module and a QSFP-DD module interoperate over the fibre.
Is your QDD-400G-LR8 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-400G-LR8 price in India and how do I order?
The Arista QDD-400G-LR8 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-400G-LR8 draw?
Arista lists maximum power of 14 W for the QDD-400G-LR8. 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-400G-VSR4400GBASE-VSR4, 30 m OM3 / 50 m OM4OSFP-400G-SR8400GBASE-SR8, 70 m OM3 / 100 m OM4OSFP-400G-SR8-C400GBASE-SR8 + 8 × 50G / 25G-SR, 70 m OM3 / 100 m OM4OSFP-400G-SRBD400GBASE-BIDI, 70 m OM3 / 100 m OM4OSFP-400G-DR4400GBASE-DR4, 500 m SMFOSFP-400G-XDR4400GBASE-XDR4, 2 km SMFGovernment, PSU and enterprise orders welcome. GST invoice and pan-India delivery.
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