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Arista QDD-400G-SRBD 400GBASE-SR4.2 (400G-BIDI), 4x 100GBASE-BIDI (100G-SRBD) and 4x 100GBASE-SR1.2 QSFP-DD Transceiver, MPO-12 UPC connector.
Arista

Arista QDD-400G-SRBD 400GBASE-SR4.2 (400G-BIDI), 4x 100GBASE-BIDI (100G-SRBD) and 4x 100GBASE-SR1.2 QSFP-DD Transceiver, MPO-12 UPC connector.

MPN: QDD-400G-SRBD
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$699.00
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+1 214 607-4800
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Lifetime
Warranty
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ISO 9001
Certified Testing
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R2v3
Responsible Refurb
25+
Years
5K+
Customers
ISO
Certified
✓
Tested

Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.

Tested to factory specification. Backed by 25 years of enterprise trust.

The Arista QDD-400G-SRBD is a high-performance 400 Gigabit Ethernet QSFP-DD (Quad Small Form-factor Pluggable Double Density) optical transceiver designed for short-reach, high-density data center networking. Utilizing 400GBASE-SR4.2 BiDi (Bidirectional) technology, it delivers 400 Gbps connectivity over OM4 or OM5 multimode fiber using an MPO-12 optical connector, supporting transmission distances of up to 100 meters on OM4 and 150 meters on OM5 fiber.



The module is software configurable to operate as a native 400GBASE-SR4.2 transceiver or as a breakout solution supporting 4 × 100GBASE-SRBD (100G BiDi) or 4 × 100GBASE-SR1.2 interfaces. This flexibility makes it an excellent choice for organizations migrating from 100G to 400G Ethernet while maximizing existing multimode fiber infrastructure.

Technical Specifications
Type
QSFP-DD / 400GBASE-SR4.2
Brand
Arista
Speed
400 Gigabit Ethernet (400 Gb/s)
Reach
Up to 100 m (OM4), Up to 150 m (OM5)
Fiber
OM4 or OM5 Multimode Fiber (MMF)
Wavelength
850 nm / 910 nm
Connector
MPO-12 (8 active fibers)
Lanes
4 × 100G transmit / receive lanes
Ideal Use Cases
What's Included
✔ Arista QDD-400G-SRBD New Optical Transceiver (1x)
✔ Protective dust caps installed
✔ WhaleyComm ISO 9001-certified inspection certificate
✔ WhaleyComm Lifetime Warranty
Lifetime Warranty — No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. No time limits, no expiration, no hidden conditions. Backed by 25 years and 5,000+ satisfied customers.
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Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
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Compatible Applications
✓
400G Data Center Switching & Routing
✓
Spine-Leaf Network Architectures
✓
High-Performance Computing (HPC) Interconnects
✓
Top-of-Rack (ToR) Server Connectivity
✓
Cloud & Hyperscale Infrastructure
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Shipping & Returns
Clear fulfilment, tracking, return, warranty, and support information for enterprise hardware orders.
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Shipping
Orders ship within 1-2 business days from our facility in Texas. Overnight and expedited shipping available at checkout.
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Returns
Contact our support team for any DOA or warranty issues. Every WhaleyComm unit is covered by a Lifetime Warranty — we make it right, fast.
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Contact
+1 214 607-4800 | Mon-Fri 8am-6pm CST
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Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
This unit is sold as New and has never been deployed. It ships in original or equivalent packaging with a WhaleyComm Lifetime Warranty.
Yes. Every WhaleyComm unit ships with a Lifetime Warranty — no time limits, no questions asked. If your Arista QDD-400G-SRBD fails under normal operating conditions at any point, we replace it at no cost.
Every unit goes through an ISO 9001-certified testing process: full power-on diagnostics, port-by-port functionality testing, firmware verification, factory reset, and final inspection. Backed by 25 years and 5,000+ enterprise customers.
Arista QDD-400G-SRBD 400GBASE-SR4.2 (400G-BIDI), 4x 100GBASE-BIDI (100G-SRBD) and 4x 100GBASE-SR1.2 QSFP-DD Transceiver, MPO-12 UPC connector.
$699.00
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