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Arista QDD-400G-XDR4-S 400GBASE-XDR4 QSFP-DD 1310nm 2 km SMF
400 Gbps 400GBASE-XDR4 (4 × 100G-FR) QSFP-DD transceiver, 1310 nm, up to 2 km SMF, 0 to 70 °C case temperature.
- Manufacturer
- Arista Networks, Inc.
- Mfr part number
- QDD-400G-XDR4-S
- Series
- 400G QSFP-DD
- Category
- Fiber optic transceiver modules
- Datasheet
- QDD-400G-XDR4-S datasheet (PDF)
QDD-400G-XDR4-S specifications
| Attribute | Value |
|---|---|
| Part Number | QDD-400G-XDR4-S |
| Manufacturer | Arista Networks, Inc. |
| Brand | Arista Networks |
| Standard | 400GBASE-XDR4 (4 × 100G-FR) |
| Form Factor | QSFP-DD, hot-swappable |
| Data Rate | 400 Gbps |
| Wavelength | 1310 nm |
| Media | Parallel single-mode (G.652) |
| Max Distance | 2 km SMF |
| Connector | SN connectors |
| Tx Power | −2.4 to +4.0 dBm/lane |
| Rx Power | −6.4 to +4.5 dBm/lane |
| Breakout | 4 × 100G-FR |
| Case Temp | 0 °C to 70 °C |
| Dimensions | 13.5 × 18.4 × 78.3–93.3 mm |
| Reach detail | 2 km on parallel single-mode fiber (4 × 100GBASE-FR) |
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-XDR4-S
The Arista QDD-400G-XDR4-S is a hot-swappable QSFP-DD 400GBASE-XDR4 (4 × 100G-FR) optical transceiver for 400 Gbps Ethernet over parallel single-mode (G.652), with a SN connectors interface and reach of up to 2 km SMF. It also supports breakout to 4 × 100G-FR. Typical uses: 400G spine and super-spine fabrics, AI/ML clusters, 4 × 100G breakout and data-centre interconnect.
- 400 Gbps 400GBASE-XDR4 up to 2 km SMF
- SN connectors: four duplex lanes, high density
- Breakout to 4 × 100G-FR (2 km)
- SN connectors connector · Parallel single-mode (G.652)
- Genuine Arista optic · GST invoice · pan-India dispatch
QDD-400G-XDR4-S: frequently asked questions
What is the Arista QDD-400G-XDR4-S?
The Arista QDD-400G-XDR4-S is a QSFP-DD 400GBASE-XDR4 (4 × 100G-FR) 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-XDR4-S?
Arista specifies the QDD-400G-XDR4-S for 2 km on parallel single-mode fiber (4 × 100GBASE-FR).
What are the transmit and receive power levels of the QDD-400G-XDR4-S?
Per Arista's published optics data sheet, the QDD-400G-XDR4-S transmits −2.4 to +4.0 dBm/lane and receives −6.4 to +4.5 dBm/lane.
Which fiber and connector does the QDD-400G-XDR4-S need?
The QDD-400G-XDR4-S uses a SN connectors connector on parallel single-mode (G.652), at 1310 nm. Both ends of the link must use the same optical standard.
Is the QDD-400G-XDR4-S 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.
What does the -S suffix mean on Arista 400G optics?
-S versions use SN optical connectors instead of a single MPO-12 APC. SN gives four independent duplex connections from one module, which makes 4 × 100G breakout cabling neater and denser.
Does the QDD-400G-XDR4-S support breakout?
Yes. Arista lists breakout to 4 × 100G-FR. Use the matching optics at the far end and a suitable breakout cable or patch panel.
Is your QDD-400G-XDR4-S 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-XDR4-S price in India and how do I order?
The Arista QDD-400G-XDR4-S 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.
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Arista family datasheet
Related Arista parts
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