Cisco

Cisco QDD-2Q200-CU1M | 400G QSFP56-DD→2x200G QSFP56 DAC | 8x50G PAM4 (CR8 to 2x CR4) | passive twinax | 1m | QSFP56-DD to 2x QSFP56, CMIS/MSA

SKU:QDD-2Q200-CU1M

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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: 1m.

Features

- High-density 400G to dual 200G breakout in a single assembly
- Low latency, low power passive copper interconnect
- Reliable short-reach connectivity for top-of-rack and adjacent rack links
- MSA and CMIS compliant for broad platform interoperability
- Tool-less installation with integrated QSFP56-DD and QSFP56 connectors

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: Does this cable require the 400G port to support breakout?
A: Yes. The 400G QSFP56-DD port must be configured for 2×200G breakout mode.

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

Q: What is the typical use case?
A: Connecting a 400G switch port to two 200G switch or server NIC ports within the same rack or adjacent racks.

Q: Can it run longer than its specified length?
A: No. Passive DAC reach is limited to the specified cable length; choose a longer DAC or an AOC/optical solution for greater distances.

Q: Is it MSA compliant?
A: Yes, it follows QSFP56-DD/QSFP56 MSA with CR8/CR4 passive copper signaling and CMIS management.

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: 1 meter
- Reach: Up to 1m (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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