Arista

Arista CAB-D-8S-400G-1M | 400G DAC breakout | QSFP-DD to 8x SFP56 | 400GBASE-CR8 / 50GBASE-CR | Copper (no wavelength) | 1m reach | Passive twinax

Arista CAB-D-8S-400G-1M | 400G DAC breakout | QSFP-DD to 8x SFP56 | 400GBASE-CR8 / 50GBASE-CR | Copper (no wavelength) | 1m reach | Passive twinax

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

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Description

High-density passive DAC for breaking a single 400G port into eight 50G links. QSFP-DD host end fans out to eight SFP56 50G CR connectors, perfect for short-reach leaf/spine or server connectivity. Direct-attach copper minimizes latency and simplifies deployment with no optics to manage.

Features

- Ultra-dense 400G to 8x50G breakout in a single cable
- Cost and power savings versus optical transceivers
- Passive copper design for minimal latency
- Standards-based 400G/50G CR interoperability
- Simple deployment with QSFP-DD to SFP56 fan-out

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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FAQs

Technical Specifications

FAQs

Q: What form factors are on each end?
A: QSFP-DD on the host side and eight SFP56 50G on the breakout ends.

Q: Is this cable passive?
A: Yes, it is a passive twinax DAC.

Q: Do I need to enable breakout mode?
A: Yes, most platforms require enabling 400G to 8x50G breakout on the QSFP-DD port.

Q: Will it work with different vendors’ equipment?
A: It adheres to MSA guidelines, but platform-specific coding may apply. Verify compatibility for your devices.

Q: What applications is it best for?
A: Short-reach, high-density leaf/spine, TOR, and server aggregation where 50G endpoints are needed.

Technical Specifications

- Aggregate speed: 400Gbps (breakout to 8x 50Gbps)
- Host interface: QSFP-DD, 8 lanes
- Remote interfaces: 8x SFP56 50G (CR)
- Ethernet standards: 400GBASE-CR8 and 50GBASE-CR
- Cable type: Passive twinax, direct-attach copper
- Reach/length: 1 meter
- Latency: Near-zero (no optical conversion)
- Power: No external power; passive cable
- Use case: Break a 400G port into eight 50G switch or NIC ports
- Compliance: MSA-compatible coding; device must support 400G→8x50G breakout

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