• Arista cab-d-8s-400g-2m with metallic 400g qsfp-dd module and yellow latch connected to eight 50g sfp28 via blue cables
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Arista

Arista CAB-D-8S-400G-2M | 400G QSFP-DD to 8x 50G SFP28 DAC Breakout Cable, 2m

Arista CAB-D-8S-400G-2M | 400G QSFP-DD to 8x 50G SFP28 DAC Breakout Cable, 2m

CAB-D-8S-400G-2M

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Description

The Arista CAB-D-8S-400G-2M is a 400GBASE-CR8 passive Direct Attach Copper (DAC) breakout cable designed for high-density data centre interconnects. It converts a single QSFP-DD 400G port into eight independent 50GBASE-CR SFP28 lanes, enabling cost-effective, low-latency server-to-switch and switch-to-switch connectivity at 2 metres. This passive twinax cable eliminates the need for optical transceivers, reducing power consumption and capital expenditure in spine-leaf and top-of-rack deployments.

Compatible with Arista 7000-series and 7500-series platforms, this breakout cable integrates seamlessly into Arista EOS-managed environments and supports automated provisioning workflows. It is ideal for hyperscale data centres, high-performance computing clusters, and any infrastructure requiring dense 50G server connectivity from a single 400G switch port. Visit iptrading.com.au to secure your order — enterprise-grade hardware with expert support.

Features

- 400G to 8x 50G breakout architecture maximises switch port utilisation in high-density deployments
- Passive DAC design delivers ultra-low latency and zero optical conversion overhead
- No transceivers required — significantly lowers per-port cost compared to active optical solutions
- QSFP-DD to 8x SFP28 enables flexible server and storage connectivity from a single uplink port
- 2-metre length ideal for within-rack and adjacent-rack top-of-rack switching scenarios
- Fully compatible with Arista EOS for seamless provisioning, monitoring, and management
- Reduces power draw and cooling requirements versus active or optical alternatives
- Industry-standard connectors ensure broad interoperability across modern data centre platforms

Warranty

Arista hardware products come with a 1-year limited hardware warranty, covering defects in materials and workmanship under normal use.
Extended Warranty Options:
IP Trading offers tailored extended warranty solutions and support packages for Arista products. Contact our team to explore options that align with your organisation's needs.
https://www.arista.com/assets/data/pdf/Warranty.pdf

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

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Technical Specifications

FAQs

Datasheet

Technical Specifications

- Cable type: Passive Direct Attach Copper (DAC) Twinax
- Connector A: QSFP-DD (400G)
- Connector B: 8x SFP28 (50G each)
- Protocol: 400GBASE-CR8 (breakout to 8x 50GBASE-CR)
- Total aggregate bandwidth: 400 Gbps
- Per-lane speed: 50 Gbps
- Cable length: 2 metres
- Encoding: NRZ / PAM4 (per-lane 50G NRZ)
- Power consumption: Passive (no active components)
- Operating temperature: 0°C to 70°C (standard data centre range)
- Compatibility: Arista 7000-series, 7500-series, and compatible third-party platforms

FAQs

Q: What does the CAB-D-8S-400G-2M cable do?
A: It breaks out a single 400G QSFP-DD port into eight independent 50G SFP28 connections, allowing you to connect up to eight servers or devices from one switch port — maximising port density in your data centre.

Q: Is this an active or passive cable?
A: This is a passive Direct Attach Copper (DAC) cable. It requires no power beyond what the host ports supply and generates less heat than active optical solutions, making it ideal for short-reach intra-rack and inter-rack deployments.

Q: Which Arista switches are compatible with this cable?
A: The CAB-D-8S-400G-2M is designed for Arista platforms with QSFP-DD 400G ports, including the 7050CX3, 7060CX2, 7300X3, 7500R3, and other 7000/7500-series switches running Arista EOS.

Q: Can this cable be used with non-Arista switches?
A: While designed and validated for Arista platforms, the cable uses standard QSFP-DD and SFP28 connectors and may be compatible with other vendors' equipment. For guaranteed performance and support, use within an Arista-validated environment.

Q: What is the maximum supported cable length?
A: This variant supports a 2-metre reach, suited for top-of-rack and end-of-row server connections. Longer passive DAC cables exist, but for reaches beyond 3–5 metres, active optical cables (AOC) or transceivers are recommended.

Q: Can I purchase the Arista CAB-D-8S-400G-2M in Australia?
A: Yes. IP Trading Australia stocks Arista DAC cables and data centre connectivity solutions for Australian businesses. Visit iptrading.com.au or contact our team for pricing, availability, and volume order support.

Datasheet

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