• Silver-colored sfp+ transceiver modules with blue plastic handles and metallic connectors in arista 400g qsfp-dd dac cable
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Arista

Arista CAB-D-2Q-400G-3M | 400G QSFP-DD to 2x200G QSFP56 Passive DAC Cable, 3m

CAB-D-2Q-400G-3M

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Description

The Arista CAB-D-2Q-400G-3M is a 3-meter passive direct attach copper breakout cable designed for high-performance data center interconnects. It connects a single 400G QSFP-DD port to two 200G QSFP56 ports using PAM-4 modulation, providing a cost-effective solution for short-distance rack-to-rack connectivity. Ideal for spine-leaf architectures, storage area networks, and high-speed server connections requiring reliable 400G to 2x200G breakout functionality.

Features

Hot-pluggable QSFP-DD and QSFP56 connectors for easy installation and maintenance
- Passive copper construction eliminates need for external power
- PAM-4 modulation technology for efficient high-speed data transmission
- Low latency direct attach copper design ideal for rack-to-rack connections
- Cost-effective alternative to optical transceivers for short-distance applications
- Supports 400G to 2x 200G breakout architecture for flexible network design
- 28 AWG twinax copper cable provides durability and signal integrity
- Compatible with spine-leaf data center topologies and storage area networks
- Compliant with IEEE 802.3bj, IEEE 802.3cd, and MSA industry standards
- RoHS-compliant, environmentally friendly construction
- Low power consumption reduces operational costs and thermal load
- Suitable for switches, servers, routers, and high-performance computing 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-CR8 Passive Direct Attach Copper (DAC)
- Connector Type: QSFP-DD to 2x QSFP56 (Breakout)
- Cable Length: 3 meters (10 feet)
- Data Rate: 400G to 2x 200G (4x 50G PAM-4 per QSFP56)
- Modulation: PAM-4 (Pulse Amplitude Modulation 4-level)
- Cable Gauge: 28 AWG Twinax Copper
- Minimum Bend Radius: 39.5mm
- Temperature Range: Commercial (0°C to 70°C operating)
- Compliance: Hot-pluggable, QSFP-DD MSA, QSFP56 MSA, IEEE 802.3bj, IEEE 802.3cd, SFF-8679
- Power Consumption: Low power, passive cable design
- RoHS Compliant: Lead-free construction

FAQs

Q: Can this cable connect a 400G QSFP-DD port to two 200G QSFP56 devices?
A: Yes, the CAB-D-2Q-400G-3M is specifically designed as a breakout cable to connect one 400G QSFP-DD port to two separate 200G QSFP56 ports, enabling flexible network architecture and cost-effective scaling in data center environments.

Q: Is Forward Error Correction (FEC) required for this cable?
A: Yes, FEC should be enabled on both ends of the connection. As data rates increase to 400G and 200G with PAM-4 modulation, FEC helps maintain signal integrity and reduces bit error rates over the copper medium.

Q: Can I use this cable to connect QSFP-DD to QSFP28 100G ports?
A: No, this cable is designed for QSFP56 (200G) connectivity using PAM-4 modulation. It is not compatible with QSFP28 (100G) ports that use NRZ modulation, as the electrical signaling methods are incompatible.

Q: What is the maximum transmission distance for this cable?
A: This passive DAC cable is designed for 3-meter connections within the same rack or between adjacent racks. For longer distances beyond 3 meters, consider active optical cables (AOCs) or fiber-based solutions.

Q: Is this cable compatible with other vendor equipment besides Arista?
A: While designed for Arista systems, this cable follows industry-standard MSA specifications (QSFP-DD and QSFP56) and should work with multi-vendor environments. However, compatibility testing with specific equipment is recommended before deployment in mixed-vendor networks.

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