Cisco

Cisco QDD-2Q200-CU2M | 400G QSFP56-DD→2x200G QSFP56 DAC | 8x50G PAM4 (CR8 to 2x CR4) | passive twinax | 2m | QSFP56-DD to 2x QSFP56, CMIS/MSA

SKU:QDD-2Q200-CU2M

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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: 2m.

Features

- 2m short-reach passive twinax for dense 400G fabrics
- High reliability with simple, no-optics design
- Optimized for top-of-rack aggregation and breakout
- Standards-based CR passive signaling and CMIS support
- Cost-effective alternative to optical breakout for in-rack links

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: What equipment does this cable connect?
A: A single 400G QSFP56-DD port to two separate 200G QSFP56 ports on switches or server NICs.

Q: Is any configuration needed?
A: Yes. Enable 2×200G breakout on the 400G port in the network OS.

Q: Does passive copper add latency?
A: Latency is extremely low and typically negligible for in-rack links.

Q: Can it be routed across racks?
A: Yes, for short distances like 2m; ensure proper cable management to maintain bend radius.

Q: Is this suitable for DAC-only ports?
A: Yes, it is a DAC assembly designed for ports that accept QSFP56-DD/QSFP56 modules and DACs.

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 meters
- Reach: Up to 2m (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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