Cisco

Cisco QDD-2Q200-CU2.5M | 400G QSFP56-DD→2x200G QSFP56 DAC | 8x50G PAM4 (CR8 to 2x CR4) | passive twinax | 2.5m | QSFP56-DD to 2x QSFP56, CMIS/MSA

SKU:QDD-2Q200-CU2.5M

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Description

Passive copper twinax breakout cable for short-reach 400G to dual 200G interconnects. One QSFP56-DD 400G end breaks out to two QSFP56 200G ends (8x50G PAM4 to 2×4x50G), ideal for connecting a 400G switch port to two 200G switch/NIC ports. Requires breakout support on the 400G port. Cable length: 2.5m.

Features

- 2.5m passive twinax for flexible short-reach deployments
- Efficient 400G to dual 200G breakout with minimal latency
- Robust build for top-of-rack and adjacent rack connections
- Standards-aligned CR passive signaling for dependable performance
- No external power or optics required

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 2.5m within typical passive DAC limits?
A: Yes. Passive DAC breakouts commonly support 1–3m; 2.5m is within short-reach limits.

Q: Do I need special optics for this cable?
A: No. It is a direct-attach copper assembly; no separate optical transceivers are required.

Q: Will it auto-negotiate to other speeds?
A: No. It is designed for 400G to 2×200G operation; ensure ports are configured for these rates and breakout mode.

Q: Can I use it between different vendors’ devices?
A: Interoperability follows QSFP56-DD/QSFP56 MSA and CMIS, but device firmware coding policies may apply. Check platform compatibility.

Q: Is it hot-swappable?
A: Yes, QSFP form factors are hot-swappable when supported by the host platform.

Technical Specifications

- Cable type: Passive direct-attach copper (DAC), twinax
- Form factor: QSFP56-DD (400G) to 2× QSFP56 (200G)
- Aggregate data rate: 400Gbps; breakout: 2×200Gbps
- Lane configuration: 8×50G PAM4 to 2×(4×50G) PAM4
- Ethernet CR compliance: 400GBASE-CR8 to 200GBASE-CR4 (MSA)
- Length: 2.5 meters
- Reach: Up to 2.5m (passive copper)
- Connector: QSFP56-DD male to 2× QSFP56 male
- Management: CMIS/MSA compliant
- Breakout requirement: 400G port must support 2×200G breakout

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