Name: QDD-400-CU2.5M Cisco 400G QSFP-DD 8ft Passive Copper Twinax Cable
Brand: Cisco
SKU: QDD-400-CU2.5M
Price: 322.00 USD
Availability: InStock
Rating: 4.8 (119 reviews)

Product Overview
The QDD-400-CU2.5M cable serves as a passive copper link for 400G QSFP-DD ports, mainly used to connect network devices in data centers. It offers a straightforward solution for short-range high-speed connections without extra components, fitting well where direct copper connections are preferred for simplicity and efficiency.

General Information
Brand	Cisco
Part Number	QDD-400-CU2.5M

Technical Information
Data Rate	400 Gbps (400G)
Cable Length	2.5 m (8 ft)
Compatibility	Cisco QSFP-DD compatible devices (Cisco Nexus and other 400G switches/routers)
Stacking Bandwidth	400 Gbps

Physical Characteristics
Weight	5.00
Condition	Refurbished

Product Description
This 8ft QSFP-DD passive direct attach copper (DAC) cable offers a straightforward, high-speed connection for data center networking equipment. It's built for linking switches, routers, or servers supporting 400Gbps throughput over short distances without needing transceivers. Often found in enterprise and service provider environments, the cable simplifies cabling setups where fiber optics aren’t necessary or cost-effective. Network engineers and IT teams benefit from its plug-and-play design and reliable signal integrity. Key Features Provides a direct copper connection reducing the need for optical modules Supports 400G Ethernet for bandwidth-intensive applications Passive twinax solution keeps power consumption low Compatible with a range of Cisco QSFP-DD enabled hardware Durable construction suited for dense rack deployments It's commonly deployed within data centers for short-reach interconnects, where speed and signal quality are crucial but fiber optics are unnecessary. This cable streamlines high-speed network setups while keeping complexity and cost in check.

Use Cases
The QDD-400-CU2.5M passive copper cable is optimized for high-density, short-reach connections within data center racks and aggregation points. It is ideal for network engineers and IT professionals managing high-performance computing environments where direct, low-latency 400G links are essential for workload efficiency. How It's Used: Connecting top-of-rack switches to spine switches in hyperscale data centers to support virtualization and cloud workloads. Establishing direct links between storage clusters requiring ultra-high bandwidth and minimal latency in enterprise IT environments. Facilitating short-reach connections in edge computing deployments where space and power efficiency are critical. Enabling seamless interconnects within high-performance computing (HPC) clusters for scientific or financial modeling applications. Supporting data center fabric expansion by linking QSFP-DD enabled Cisco switches in tightly packed rack deployments. This cable supports operational efficiency by providing reliable, power-efficient 400G connections with minimal signal loss, helping organizations scale their network infrastructure while maintaining performance integrity in demanding environments.

QDD-400-CU2.5M Cisco 400G QSFP-DD 8ft Passive Copper Twinax Cable

Product Overview

General Information

Technical Information

Physical Characteristics

Product Description

Use Cases