Arista CAB-D-D-400G-3M | 400G QSFP-DD Passive Twinax Cable, 3m, 26AWG

SKU:CAB-D-D-400G-3M

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Description

The Arista CAB-D-D-400G-3M is a 400G passive direct attach copper cable with QSFP-DD connectors on both ends, designed for high-speed data centre interconnects. This 3-metre twinax cable provides a cost-effective solution for connecting 400G QSFP-DD ports within racks and across adjacent racks. It supports data rates up to 400 Gbps for applications such as 400G Ethernet and 200G Ethernet, making it ideal for high-density Top of Rack architectures and modern data centre deployments.

Features

Passive copper twinax construction for low power consumption and heat dissipation
- QSFP-DD form factor with 8x50G PAM-4 electrical lanes for 400G bandwidth
- MSA-compliant design ensures broad interoperability across vendor platforms
- Cost-effective alternative to optical transceivers for short-reach applications
- Built-in digital diagnostics monitoring for cable health and performance visibility
- Flexible twinax cable design for efficient cable management in high-density environments
- IEEE 802.3 and QSFP-DD MSA standards compliance
- RoHS and REACH environmental compliance for sustainable deployment
- Commercial temperature range operation suitable for standard data centre environments
- Low latency passive copper path for high-performance computing and storage applications

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

Cable Type: 400GBASE-CU Passive Direct Attach Copper (DAC)
- Connector Type: QSFP-DD to QSFP-DD
- Cable Length: 3 metres (9.8 feet)
- Wire Gauge: 26 AWG twinax copper
- Data Rate: Up to 400 Gbps aggregate bandwidth
- Electrical Interface: 8 electrical lanes at 50 Gbps PAM-4 per lane
- Minimum Bend Radius: 33mm
- Jacket Material: PVC (OFNR rated)
- Operating Temperature: 0°C to 70°C (commercial range)
- Compliance: QSFP-DD MSA, IEEE 802.3, SFF-8679, RoHS, REACH
- Digital Diagnostics Monitoring (DDM): Supported
- Power Consumption: Low power passive copper interconnect

FAQs

Q: What is the maximum reach of the CAB-D-D-400G-3M cable?
A: This passive direct attach copper cable has a fixed length of 3 metres and is designed for short-reach connectivity within or between adjacent racks in data centres.

Q: Is this cable compatible with other vendor 400G QSFP-DD switches?
A: Yes, the cable is built to QSFP-DD MSA industry standards and should be compatible with any switch or device with standard 400G QSFP-DD ports, though full compatibility testing with your specific equipment is recommended.

Q: Can this cable support lower speed breakout configurations?
A: This is a standard 400G QSFP-DD to QSFP-DD cable. For breakout applications (e.g., 4x100G or 8x50G), you would need specific breakout DAC cables with the appropriate connector configurations.

Q: What are the advantages of DAC cables over optical transceivers?
A: Direct attach copper cables are more cost-effective than optical modules, consume less power, generate less heat, and are ideal for short-distance connections within racks or between adjacent racks. They eliminate the need for separate transceivers and fibre patch cables.

Q: Does this cable require any special configuration or licensing?
A: No, passive DAC cables are plug-and-play devices that do not require any software licensing or special configuration. They are automatically detected when inserted into compatible QSFP-DD ports.