Cisco

Cisco QDD-4ZQ100-CU3M | 400G->4x100G | QSFP-DD to 4x QSFP56 | 100GBASE-CR2 | passive copper DAC | 3m reach | connectors: QSFP-DD/QSFP56

SKU:QDD-4ZQ100-CU3M

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Description

Passive twinax breakout DAC that converts one 400G QSFP-DD interface into four independent 100G CR2 links over QSFP56 connectors. Perfect for short-reach top-of-rack to server or leaf connections with minimal latency and no optics required. Ensure host and peer ports support 4x100G breakout and 100GBASE-CR2 respectively.

Features

- Single 400G port split to four 100G CR2 links
- Passive design: no power, minimal latency, low heat
- QSFP-DD to 4x QSFP56 with secure latching
- Standards-aligned 100GBASE-CR2 signaling
- Optimized for short data center interconnects
- Budget-friendly alternative to optics for up to 3m

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 3 meters within passive DAC limits?
A: Yes, 3m is a common maximum reach for passive breakout DACs, subject to host signal conditioning support.

Q: Does this cable require any licensing or features on the switch?
A: Your switch must support 4x100G breakout on QSFP-DD ports and 100GBASE-CR2 on downlink ports.

Q: Can I mix with optical on the 100G side?
A: No, the 100G side is QSFP56 copper CR2; it connects directly to compatible QSFP56 100G copper ports, not optical cages with transceivers.

Q: How many links does it provide?
A: Four independent 100G links from a single 400G port.

Q: Is it field-serviceable?
A: No, DACs are fixed assemblies; choose the length that suits your deployment.

Technical Specifications

- Cable type: Passive Direct Attach Copper (Twinax) DAC
- Aggregate data rate: 400Gbps
- Breakout configuration: 4 x 100Gbps
- Host form factor: QSFP-DD (400G)
- Remote form factor: 4 x QSFP56 (100G each)
- Ethernet standard on breakouts: 100GBASE-CR2
- Reach: 3 meters
- Power consumption: 0 W (passive)
- Latency: Near-zero
- Connector interface: QSFP-DD to 4x QSFP56
- Typical use: 400G switch port to four 100G switch/NIC ports
- Compatibility: Requires 400G QSFP-DD port supporting 4x100G breakout and 100G QSFP56 (CR2) ports on peers
- Medium: Shielded copper twinax

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