Arista

Arista CAB-D-2Q-400G-1M | 400G to 2x200G Breakout | QSFP-DD to 2×QSFP | 400GBASE-CR8 to 2×200GBASE-CR4 | Passive Twinax DAC | 1 m | IEEE 802.3cd | PAM4

Arista CAB-D-2Q-400G-1M | 400G to 2x200G Breakout | QSFP-DD to 2×QSFP | 400GBASE-CR8 to 2×200GBASE-CR4 | Passive Twinax DAC | 1 m | IEEE 802.3cd | PAM4

SKU:CAB-D-2Q-400G-1M

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Description

Passive DAC breakout for splitting a 400GbE QSFP-DD port into two 200GbE QSFP ports; ideal for leaf-spine fan-out within 1 m where low latency and low power are critical.

Features

- Enables 1×400G to 2×200G fan-out on a single port
- Ultra-low latency, near-zero power breakout
- Cost-effective alternative to optical fan-out
- Robust twinax for short in-rack deployments
- Plug-and-play with compatible breakout-capable ports

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: Do I need to enable breakout on the 400G port?
A: Yes. The host platform must support and be configured for 2×200G breakout on the QSFP-DD port.

Q: Are the 200G ends QSFP or QSFP56?
A: They are QSFP-form 200G ends (often referred to as QSFP56 for 200G PAM4).

Q: Is it passive?
A: Yes, it is a passive twinax DAC breakout assembly.

Q: Can I use only one 200G leg?
A: Behavior varies by platform; most require proper breakout configuration and may prefer both legs connected.

Q: Is cross-vendor interoperability guaranteed?
A: Not guaranteed; ensure both ends support DAC breakout and the required coding.

Technical Specifications

- Data rate: 1×400G to 2×200G (aggregate 400G)
- Form factors: QSFP-DD (8 lanes) to 2× QSFP (4 lanes each)
- Base standards: 400GBASE-CR8 and 200GBASE-CR4 (IEEE 802.3cd)
- Signaling: PAM4, 8×50G split into 2×(4×50G)
- Cable type: Passive twinax copper (DAC) breakout
- Length: 1 meter
- Reach: Up to 1 m passive
- Power: Near-zero (passive, <0.1 W per end)
- Management/ID: CMIS (QSFP-DD) / QSFP ID for 200G ends
- Operating temperature: 0 to 70°C (commercial)
- Compliance: RoHS
- Port requirement: Host must support 2×200G breakout on the 400G port

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