Arista

Arista CAB-D-8S-400G-2M | 400G breakout 8x50G | passive DAC twinax | 400GBASE-CR8 / 50GBASE-CR | copper (no wavelength) | 2m | QSFP-DD to 8x SFP56

Arista CAB-D-8S-400G-2M | 400G breakout 8x50G | passive DAC twinax | 400GBASE-CR8 / 50GBASE-CR | copper (no wavelength) | 2m | QSFP-DD to 8x SFP56

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

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Description

High-density 400G DAC breakout cable that fans out a single QSFP-DD port to eight 50G lanes for TOR/leaf-spine, storage, and interconnects. Passive twinax construction delivers ultra-low latency and zero power draw while maintaining signal integrity over short-reach links. Compatible with devices that support QSFP‑DD to 8×50G breakout and the cable’s coding profile.

Features

- 400G to 8×50G breakout for maximum port density
- Passive copper DAC: zero power, ultra‑low latency
- QSFP‑DD to 8× SFP56 for broad 50G connectivity
- Short‑reach, cost‑effective alternative to optics
- Standards‑aligned 400GBASE‑CR8 / 50GBASE‑CR
- Robust latching connectors and strain relief

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: Is this cable passive or active?
A: It is a passive twinax DAC requiring no external power and offering very low latency.

Q: What devices is this compatible with?
A: Any switch, router, or NIC with a QSFP‑DD port that supports 8×50G breakout and the cable’s coding profile, and peers with SFP56 50G ports.

Q: Can I mix speeds on the breakout legs?
A: No. All eight legs operate at 50G; the host must support 8×50G breakout on the QSFP‑DD port.

Q: Is there an optical wavelength?
A: No. This is a copper DAC; there is no optical wavelength.

Q: Typical applications?
A: Top‑of‑rack to servers/NICs, leaf‑to‑spine breakouts, and short‑reach intra‑rack links.

Technical Specifications

- Aggregate speed: 400G (breakout to 8×50G)
- Lane rate/encoding: 50G PAM4 per lane
- Form factor ends: QSFP‑DD to 8× SFP56
- Cable type: Passive twinax DAC (copper)
- Standards: 400GBASE‑CR8, 50GBASE‑CR; IEEE 802.3 compliant
- Reach: 2 meters
- Power: 0 W (passive), ultra‑low latency
- Use case: QSFP‑DD 400G port breaking out to 8× 50G switch/server NIC ports

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