400GBase-CU QSFP-DD Direct Attach Cable - 0.5m Passive Twinax
The Add-On CAB-D-D-400G-0-5M is a 400GBase-CU QSFP-DD to QSFP-DD direct attach cable engineered for high-speed data center environments requiring ultra-reliable connectivity. This passive twinax cable delivers 400 Gbps performance over copper at distances up to 0.5 meters, making it ideal for rack-to-rack and switch-to-server deployments. Built to TAA compliance standards and fully compatible with Arista Networks equipment, this cable has been individually serialized, programmed, and application-tested to guarantee 100% functional compatibility. Whether you're upgrading legacy infrastructure or building new high-performance networks, this QSFP-DD direct attach solution provides cost-effective, low-latency connectivity without the complexity of active components.
Key Features
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400GBase-CU Performance — Delivers 400 Gbps throughput over passive copper conductors
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QSFP-DD Connectors — Dual-port QSFP-DD interface for seamless integration with modern switches and transceivers
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0.5m Reach — Optimized 0.5-meter length for short-distance, high-density deployments
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Passive Twinax Design — No active components required; reduced power consumption and latency
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TAA Compliant — Meets Trade Agreements Act requirements for government and enterprise procurement
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MSA Standards Certified — Built to Multi-Source Agreement specifications for cross-vendor compatibility
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100% Tested & Serialized — Individually programmed and data-traffic tested before shipment
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Arista Networks Compatible — Fully compatible with Arista CAB-D-D-400G-0-5M specifications
Technical Specifications
| Specification |
Details |
| Manufacturer |
Add-On |
| Part Number |
CAB-D-D-400G-0-5M-AO |
| Compatible With |
Arista Networks CAB-D-D-400G-0-5M |
| Cable Type |
400GBase-CU Direct Attach (Passive Twinax) |
| Connector Type |
QSFP-DD to QSFP-DD |
| Data Rate |
400 Gbps |
| Maximum Reach |
0.5 meters (1.6 feet) |
| Compliance |
TAA Compliant, MSA Standards |
| Power Requirement |
None (Passive) |
| Testing |
100% Data-Traffic & Application Tested |
| Serialization |
Uniquely Serialized & Programmed |
Frequently Asked Questions
What is a 400GBase-CU direct attach cable?
A 400GBase-CU direct attach cable is a passive copper interconnect that enables 400 Gbps connectivity between network switches, servers, and transceivers. Unlike active cables, passive twinax designs eliminate power consumption and latency, making them ideal for short-distance, high-density data center applications.
Is this QSFP-DD cable compatible with my Arista equipment?
Yes. The Add-On CAB-D-D-400G-0-5M-AO is 100% compatible with Arista Networks CAB-D-D-400G-0-5M specifications. It has been individually tested and programmed to ensure full functional compliance with Arista switches and transceivers.
What does TAA compliant mean for this cable?
TAA (Trade Agreements Act) compliance certifies that this cable meets U.S. federal procurement standards. It qualifies for government contracts and enterprise purchasing programs that require TAA-compliant networking equipment.
Can I use this 0.5m cable for longer distances?
No. This cable is rated for a maximum reach of 0.5 meters (1.6 feet). For longer distances, consider active 400GBase-CU cables or fiber-based solutions. The 0.5m specification ensures optimal signal integrity for short-reach, high-speed deployments.
