• Silver-colored arista H-D400-4Q100-1M sfp+ transceiver modules with blue handles and metallic connectors for 400g active DAC
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Arista

Arista H-D400-4Q100-3M-Arista | 400G QSFP-DD to 4x 100G Breakout Cable, 3m Active DAC

H-D400-4Q100-3M-Arista

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Description

The Arista H-D400-4Q100-3M is a 400GBASE-CR8 active twinax breakout cable designed for high-density data centre connectivity. This 3-metre cable connects a single 400G QSFP-DD port to four 100G QSFP28 ports, enabling efficient bandwidth breakout for spine-leaf architectures and server connectivity. An integrated gearbox converts 8x 50G PAM-4 signals to 4x 25G NRZ per QSFP28 port, ensuring seamless compatibility with legacy 100G infrastructure while delivering cost-effective, low-latency performance.

Features

400G to 4x 100G breakout topology for flexible bandwidth distribution
- Integrated gearbox for PAM-4 to NRZ signal conversion
- Active copper technology enables 3-metre reach with low latency
- Hot-swappable for simplified installation and maintenance
- IEEE 802.3 compliant for industry-standard interoperability
- Cost-effective alternative to optical breakout solutions
- Low power consumption compared to transceiver-based solutions
- Twinax copper construction for reliable high-speed data transmission
- Supports commercial temperature range for data centre deployments
- Suitable for spine-leaf architectures and high-density server connectivity

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 Active Twinax Breakout Cable
- Form Factor: QSFP-DD to 4x QSFP28 (100GBASE-CR4)
- Cable Length: 3 metres
- Data Rate: 400Gbps aggregate (4x 100Gbps breakout)
- Electrical Interface: 8x 50G PAM-4 (QSFP-DD end) to 4x 25G NRZ per QSFP28 (breakout ends)
- Integrated Gearbox: PAM-4 to NRZ signal conversion at QSFP28 ends
- Compliance: IEEE 802.3 400GBASE-CR8 and 100GBASE-CR4 standards
- Temperature Range: Commercial (0°C to 70°C operating)
- Hot-swappable: Yes
- Power Consumption: Low power active copper design

FAQs

Q: What is the primary use case for this breakout cable?
A: The H-D400-4Q100-3M enables breakout of a single 400G QSFP-DD port into four 100G QSFP28 connections, ideal for connecting 400G spine switches to 100G leaf switches, servers, or storage arrays in data centre environments.

Q: Is this cable compatible with legacy 100G QSFP28 equipment?
A: Yes, the integrated gearbox in each QSFP28 connector converts 2x 50G PAM-4 electrical lanes to 4x 25G NRZ, ensuring full compatibility with standard 100GBASE-CR4 QSFP28 ports on existing switches and servers.

Q: Can I use this cable with non-Arista equipment?
A: While designed for Arista platforms, this cable follows IEEE 802.3 standards and may work with other vendors' equipment that supports 400G QSFP-DD to 100G QSFP28 breakout configurations. Always verify compatibility with your specific hardware.

Q: What are the advantages of active copper over passive DAC or fibre?
A: Active copper cables like the H-D400-4Q100-3M offer longer reach than passive DAC (up to 5m vs 3m maximum for passive), lower cost than optical breakout solutions, and lower power consumption than transceivers, making them ideal for rack-to-rack connections.

Q: Does this cable require any special configuration on Arista switches?
A: The cable is hot-swappable and typically auto-negotiates. Ensure your Arista EOS software version supports 400G breakout functionality (refer to Arista's transceiver compatibility guide for minimum EOS version requirements).

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