Cisco

Cisco QDD-4ZQ100-CU1M | 400G->4x100G | QSFP-DD to 4x QSFP56 | 100GBASE-CR2 | passive copper DAC | 1m reach | connectors: QSFP-DD/QSFP56

SKU:QDD-4ZQ100-CU1M

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Description

Passive copper breakout DAC for splitting a 400G QSFP-DD port into four 100G CR2 links using QSFP56 ends. Ideal for short-reach, low-latency connections between adjacent racks without requiring optical transceivers. Compatible with platforms that support 4x100G breakout from QSFP-DD and 100GBASE-CR2 on the remote side.

Features

- 400G to 4x100G breakout for efficient port utilization
- Passive zero-power design with ultra-low latency
- Standards-based 100GBASE-CR2 on the 100G legs
- Rugged twinax construction for short-reach data center runs
- Tool-less latching for secure, reliable connections
- Cost-effective alternative to optical transceivers for short distances

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 this an active or passive cable?
A: It is a passive direct attach copper (DAC) breakout cable.

Q: Are separate transceivers required?
A: No. The QSFP-DD and QSFP56 ends are integrated; no optical transceivers are needed.

Q: Will this work with 100G QSFP28 ports?
A: Only if the 100G ports support QSFP56/100GBASE-CR2. It is not intended for legacy QSFP28 CR4-only ports.

Q: Is it hot-swappable?
A: Yes, QSFP-family interfaces are hot-swappable in supported systems.

Q: What is the typical use case?
A: Breaking out a single 400G QSFP-DD port into four 100G CR2 links to connect to switches, servers, or NICs with QSFP56 100G ports.

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: 1 meter
- 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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