• Arista CAB-D-2Q-400G-2M 400G DAC breakout cable with black and gray connectors
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Arista

Arista CAB-D-2Q-400G-2M | 400G DAC breakout | QSFP-DD→2×200G QSFP56 | 400GBASE-CR8/200GBASE-CR4 | passive twinax | 2m reach | connectors: QSFP-DD to 2×QSFP56

CAB-D-2Q-400G-2M

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Description

Passive twinax DAC breakout cable for short‑reach 400G to dual 200G links. Ideal for high‑density TOR/leaf‑spine interconnects where ultra‑low latency and low power are critical. Requires ports that support breakout and CR standards.

Features

- High‑density 400G→2×200G breakout for top‑of‑rack aggregation
- Ultra‑low latency, low power, and low EMI
- Robust latching QSFP-DD/QSFP56 connectors
- Optimized for short‑reach data center fabrics
- Plug‑and‑play with breakout‑capable switch/router 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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specs-tabs

Technical Specifications

FAQs

Technical Specifications

- Host speed: 400G (breaks out to 2×200G)
- Form factors: QSFP-DD (host) to 2×QSFP56 (remotes)
- Standards: 400GBASE-CR8 to 2×200GBASE-CR4
- Cable type: passive twinax copper (DAC)
- Length: 2 meters
- Typical application: 1:2 breakout between 400G switch port and two 200G ports
- Low latency, near‑zero power consumption
- Short‑reach intra‑rack/inter‑rack connectivity
- Connector gender: QSFP-DD male to 2×QSFP56 male
- Breakout ratio: 1:2 (8 lanes → 2×4 lanes)

FAQs

Q: Is this an active or passive cable?
A: It is a passive twinax DAC; no separate optics or power are required.

Q: What equipment compatibility is required?
A: Devices must support 400GBASE-CR8 on the QSFP-DD host port and 200GBASE-CR4 on the QSFP56 remote ports, as well as 1:2 breakout mode.

Q: Can this be used beyond the stated length?
A: No. DACs are specified for short reaches; use the listed length or consider active optical alternatives for longer distances.

Q: Does it require separate transceivers?
A: No. The QSFP-DD and QSFP56 ends are integrated; no additional transceivers are needed.

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