• Arista cab-d-8s-400g-1m breakout cable with metallic 400g qsfp-dd and yellow latch connected to blue fiber optic cables
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Arista

Arista CAB-D-8S-400G-1M | 400G QSFP-DD to 8x 50G SFP DAC Breakout Cable, 1m

Arista CAB-D-8S-400G-1M | 400G QSFP-DD to 8x 50G SFP DAC Breakout Cable, 1m

CAB-D-8S-400G-1M

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Description

The Arista CAB-D-8S-400G-1M is a passive 400GBASE-CR8 QSFP-DD to 8x 50GBASE-CR SFP direct attach copper (DAC) breakout cable designed for high-density data centre interconnects. Spanning just 1 metre, it splits a single 400G QSFP-DD port into eight independent 50G SFP lanes using PAM-4 signalling — delivering near zero-latency and ultra-low power consumption without the cost of active optics. It is the ideal short-reach solution for within-rack and adjacent-rack deployments in SDN, machine learning, and cloud computing environments.

Built to QSFP-DD MSA, IEEE 802.3cd, and IEEE 802.3bj standards, this passive twinax cable also supports 8x 25G NRZ fanout for flexible deployment scenarios. The MSA-compliant 76-pin edge-type connector and TWI/I2C memory map ensure seamless integration with Arista platforms running EOS 4.23.0 or later. Available now at iptrading.com.au — competitive prices and local support.

Features

- Passive copper design delivers near zero-latency and minimal power consumption
- Breakout architecture splits one 400G QSFP-DD port into 8x independent 50G SFP connections
- Supports both PAM-4 (50G per lane) and NRZ (25G per lane) signalling modes
- Fully compliant with QSFP-DD MSA, IEEE 802.3cd, and IEEE 802.3bj standards
- Cost-effective alternative to active optical cables for within-rack and adjacent-rack deployments
- Ideal for high-density data centre, SDN, machine learning, and cloud computing environments
- Pre-terminated with MSA-compliant 76-pin edge-type connectors for plug-and-play installation
- MSA memory map accessible via 2-wire Interface (TWI/I2C) for diagnostics and monitoring
- Compatible with Arista platforms running EOS 4.23.0 or later

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

- Part Number: CAB-D-8S-400G-1M
- Cable Type: Passive Direct Attach Copper (DAC) Twinax Breakout
- Connector End 1: 1x QSFP-DD (400G)
- Connector End 2: 8x SFP (50G)
- Data Rate: 400GBASE-CR8 (8x 50GBASE-CR)
- Cable Length: 1 metre (3.28 ft)
- Wire Gauge: 30AWG
- Signalling: 8x 50 Gbps PAM-4
- Also Supports: 8x 25 Gbps NRZ fanout
- Standards: QSFP-DD MSA, IEEE 802.3cd (50GBASE-CR), IEEE 802.3bj
- Connector Type: MSA-compliant 76-pin edge type
- Memory Interface: 2-wire Interface (TWI/I2C)
- Minimum EOS Version: EOS 4.23.0

FAQs

Q: What does the CAB-D-8S-400G-1M do?
A: It is a passive DAC breakout cable that splits a single 400G QSFP-DD port into eight independent 50G SFP ports, enabling cost-effective high-density interconnects within or between adjacent racks in a data centre.

Q: What signalling modes does this cable support?
A: The cable supports 8x 50 Gbps PAM-4 signalling for 400GBASE-CR8 operation, and also supports 8x 25 Gbps NRZ fanout for deployments requiring 25G per lane connectivity.

Q: What Arista EOS version is required to use this cable?
A: Arista recommends a minimum of EOS 4.23.0 for compatibility with the CAB-D-8S-400G-1M.

Q: Is this cable active or passive?
A: It is a passive direct attach copper twinax cable, which means it requires no power beyond what the switch port provides, resulting in near zero-latency and very low power consumption compared to active optical cables.

Q: What standards does this cable comply with?
A: The CAB-D-8S-400G-1M is compliant with the QSFP-DD MSA, IEEE 802.3cd (50GBASE-CR), and IEEE 802.3bj standards, ensuring broad interoperability with MSA-compliant equipment.

Q: Can I purchase the Arista CAB-D-8S-400G-1M in Australia?
A: Yes. IP Trading is an Australian B2B IT hardware reseller and stocks Arista cables including the CAB-D-8S-400G-1M. Visit iptrading.com.au for competitive pricing and local support.

Datasheet

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