Arista QDD-800G-2VSR4 – QSFP-DD 2×VSR4 Optical Transceiver

About Arista QDD-800G-2VSR4 QSFP-DD 2×VSR4 Optical Transceiver in Bangladesh

The Arista QDD-800G-2VSR4 is an 800Gbps-class high-density optical transceiver designed for modern data center, AI, cloud, and high-performance computing networks. It uses a twin-port QSFP-DD architecture with two independent 400G VSR4 optical interfaces, allowing an 800G port to connect directly to two separate 400GbE links.

The transceiver uses eight parallel optical lanes with PAM4 modulation and operates at an 850nm optical wavelength over multimode fiber. Its dual MPO-12 APC connectors provide two independent 400G optical interfaces, making it suitable for 800G-to-2×400G breakout deployments without requiring a conventional optical breakout cable.

The QDD-800G-2VSR4 is optimized for very short-reach data center applications. Published specifications for this Arista-compatible module indicate a reach of up to approximately 50 meters over suitable multimode fiber. Actual link distance depends on the optical budget, fiber grade, connector quality, polarity, and connected equipment.

Arista QDD-800G-2VSR4 QSFP-DD 2×VSR4 Optical Transceiver Specifications & Overview

Overview

The Arista QDD-800G-2VSR4 is designed for next-generation 800GbE data center networks requiring high port density and flexible 400GbE connectivity. Instead of presenting a single conventional 800G optical interface, the module provides two independent 400G VSR4 optical connections from one QSFP-DD800 host port.

Each 400G VSR4 interface uses four 100G PAM4 optical lanes. Together, the two optical interfaces provide an aggregate 800Gbps connection. This architecture is particularly useful when connecting an 800GbE switch or network fabric to two 400GbE downstream devices.

The module uses 850nm multimode optics and dual MPO-12 APC connectors. Each MPO-12 APC interface carries one 400G optical link. Correct APC connector type, fiber polarity, lane mapping, and compatible multimode fiber must be used for reliable operation.

Because VSR4 is intended for very short-reach applications, the QDD-800G-2VSR4 is particularly suitable for intra-rack, adjacent-rack, and short-distance data center connections. Published module specifications indicate up to approximately 50 meters of reach over compatible multimode fiber.

Buy Arista QDD-800G-2VSR4 QSFP-DD 2×VSR4 Optical Transceiver in Bangladesh

Purchase the Arista-compatible QDD-800G-2VSR4 QSFP-DD 2×VSR4 Optical Transceiver from Datacom Technologies (BD). We supply high-speed optical transceivers, Arista-compatible networking optics, Ethernet switches, routers, servers, storage, fiber connectivity products, and data center infrastructure with competitive pricing, technical consultation, deployment assistance, and nationwide delivery throughout Bangladesh.

Compatibility

• Compatible Arista 800GbE Networking Platforms Supporting QDD-800G-2VSR4
• Arista QSFP-DD800 Interfaces
• 800GbE Data Center Switching Platforms
• 400GbE VSR4 Downstream Networking Platforms
• AI and GPU Networking Infrastructure
• High-Performance Computing Networks
• OM3/OM4 Multimode Fiber Infrastructure Where Supported
• Dual MPO-12 APC Fiber Cabling

Always verify the exact transceiver vendor, host switch model, EOS/firmware support, supported optics list, port configuration, power requirements, connector type, fiber polarity, and downstream 400GbE device compatibility before deployment.

Applications

• 800GbE Data Center Networking
• 800G to 2 × 400G Breakout Connectivity
• AI Cluster Networking
• GPU Infrastructure
• High-Performance Computing
• Leaf-to-Spine Connectivity
• Switch-to-Switch Connectivity
• Intra-Rack Networking
• Short-Reach Data Center Links
• Cloud Infrastructure

Benefits

• 800Gbps aggregate optical bandwidth
• Two independent 400G VSR4 optical interfaces
• High-density QSFP-DD800 form factor
• 8 × 100G PAM4 optical lane architecture
• 850nm multimode optical transmission
• Dual MPO-12 APC optical connectors
• Up to approximately 50m reach
• Supports direct 800G-to-2×400G connectivity
• DDM/DOM monitoring capability
• Ideal for AI, HPC, cloud, and high-density data center networks

Why Buy from Datacom Technologies (BD)?

Datacom Technologies (BD) supplies enterprise networking and data center products in Bangladesh, including high-speed optical transceivers, Arista-compatible networking optics, Ethernet switches, routers, servers, storage, and fiber connectivity solutions. Customers can get competitive pricing, technical consultation, deployment assistance, and after-sales support.

• Call/WhatsApp: +8801748173213
• Email: sales@datacom.com.bd
• Alternative Email: datacomtechnologiesbd@gmail.com
• Office: Tropical Center, 218, Dr. Kudroti Khuda Road, New Elephant Road, Dhaka-1205, Bangladesh

Frequently Asked Questions (FAQ)

Q1: What is the data rate of the Arista QDD-800G-2VSR4?
The module provides an aggregate 800Gbps optical interface using two independent 400GbE VSR4 links.

Q2: What does 2×VSR4 mean?
2×VSR4 means the module contains two independent 400G Very Short Reach optical interfaces. Each 400G interface uses four 100G PAM4 optical lanes.

Q3: What form factor does the QDD-800G-2VSR4 use?
It uses a twin-port QSFP-DD800 form factor designed for high-density 800GbE networking.

Q4: What type of fiber does the QDD-800G-2VSR4 use?
The module uses multimode fiber (MMF) with 850nm-class optical transmission.

Q5: What connector does the QDD-800G-2VSR4 use?
It uses two MPO-12 APC optical connectors, with each connector providing a separate 400G optical interface.

Q6: What is the reach of the QDD-800G-2VSR4?
Published specifications indicate a reach of up to approximately 50 meters over suitable multimode fiber. Actual performance depends on the fiber, optical budget, connectors, polarity, and connected equipment.

Q7: Can the QDD-800G-2VSR4 connect an 800G port to two 400G ports?
Yes. Its twin-port architecture is specifically designed to support 800G-to-2×400G breakout connectivity without requiring a conventional optical breakout cable.

Q8: Can MPO-12 APC be connected to MPO-12 UPC?
No. Arista specifically notes that the MPO-12 APC MMF connectors used by the QDD-800G-2VSR4 are not compatible with the MPO-12 UPC connectors commonly used for 100G-SR4 and 40G-SR4 MMF links.

Q9: Is the QDD-800G-2VSR4 suitable for AI and GPU networks?
Yes. Its high aggregate bandwidth, compact QSFP-DD form factor, and 2×400G connectivity make it suitable for high-density AI, GPU, HPC, and modern data center fabrics.

Q10: Is every QSFP-DD800 port compatible with the QDD-800G-2VSR4?
No. The host platform must support the required 800GbE optical module, twin-port architecture, electrical interface, power and thermal requirements, firmware, and transceiver coding. Always verify compatibility before deployment.

Q11: Is QDD-800G-2VSR4 an official Arista part number?
Arista's own documentation confirms the QDD-800G-2VSR4 product designation and its MPO-12 APC MMF architecture. The exact sourcing/manufacturing status should still be confirmed when ordering an optics module.

Q12: Where can I buy the Arista QDD-800G-2VSR4 in Bangladesh?
You can contact Datacom Technologies (BD) for 800G QSFP-DD optical transceivers and Arista-compatible networking optics with competitive pricing, technical consultation, and nationwide delivery.