Name: QDD-400G-XDR4 Arista 400GBASE-XDR4 QSFP-DD 400Gbps 2km SMF Transceiver
Brand: Arista Networks
SKU: QDD-400G-XDR4
Price: 389.00 USD
Availability: InStock
Rating: 4.8 (119 reviews)

Product Overview
The Arista QDD-400G-XDR4 transceiver delivers 400Gbps over parallel single-mode fiber, fitting into QSFP-DD slots for compact, high-density networking gear. It’s made to support medium-distance links up to 2 kilometers, commonly used in data centers and enterprise backbones where high throughput and reliable performance are needed without taking up too much space.

General Information
Brand	Arista Networks
Part Number	QDD-400G-XDR4

Technical Information
Media	SMF
Type	DFB
Power Consumption	~11 W
Protocols	400GBASE-XDR4
Connector	MTP/MPO
DOM Support	Yes

Physical Characteristics
Weight	5.00
Condition	Refurbished

Product Description
The QDD-400G-XDR4 transceiver is designed to handle ultra-high speed data transmission at 400Gbps, making it ideal for demanding networking applications. Often found in data centers and enterprise networks, it supports parallel single-mode fiber for distances up to 2 kilometers, ensuring reliable connections over moderate reaches. Built for network engineers and IT professionals managing large-scale infrastructures, this module helps maintain efficient data flow in environments where speed and space efficiency are critical. It’s commonly used to connect switches, routers, and other high-performance networking gear. Key Features Enables 400Gbps data transfer rates with XDR4 technology Supports multi-fiber parallel SMF cabling for up to 2km reach QSFP-DD form factor allows for high port density in switches and routers Low power consumption suited for large-scale deployments Compatible with standard QSFP-DD interfaces to ease integration This transceiver is typically deployed in core network segments and data center uplinks where speed and space are essential. It plays a key role in reducing latency and improving bandwidth in server farms and cloud infrastructure setups, helping maintain seamless connectivity in fast-growing network environments.

Use Cases
The Arista QDD-400G-XDR4 transceiver is commonly deployed in modern data centers and enterprise network backbones where medium-range high-speed connectivity is critical. It benefits IT teams managing dense rack deployments requiring compact, high-bandwidth links over parallel single-mode fiber with minimal latency. How It's Used: Interconnecting spine and leaf switches within enterprise data centers to support virtualization and cloud workloads. Enabling high-throughput links between storage clusters in hyperscale environments to optimize data access and replication. Providing 400Gbps uplinks in colocation facilities where dense networking gear demands compact QSFP-DD form factors. Supporting edge computing nodes requiring reliable medium-distance fiber connections with low latency for real-time data processing. Facilitating backbone connectivity in campus networks for organizations with growing bandwidth needs across multiple buildings. This transceiver enhances network scalability and operational efficiency by delivering high-capacity, low-latency connections within space-constrained environments. It is well-suited for IT infrastructures aiming to maintain consistent performance while accommodating expanding data traffic.

QDD-400G-XDR4 Arista 400GBASE-XDR4 QSFP-DD 400Gbps 2km SMF Transceiver

Product Overview

General Information

Technical Information

Physical Characteristics

Product Description

Use Cases