Cisco

Cisco QDD-4ZQ100-CU2.5M | 400G->4x100G | QSFP-DD to 4x QSFP56 | 100GBASE-CR2 | passive copper DAC | 2.5m reach | connectors: QSFP-DD/QSFP56

SKU:QDD-4ZQ100-CU2.5M

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Description

Passive copper breakout DAC that splits a 400G QSFP-DD port into four 100G CR2 links over QSFP56 connections. Designed for short- to medium-short intra-rack or adjacent-rack runs without optics, delivering low latency and zero power draw. Ensure the host supports 4x100G breakout and the peer ports support 100GBASE-CR2 in QSFP56.

Features

- Breaks out one 400G port into four independent 100G links
- Passive, zero-power, ultra-low-latency operation
- 100GBASE-CR2 compliance on each 100G leg
- Reliable twinax build for stable performance
- Cost-efficient alternative to optical transceivers for short distances
- Secure QSFP latching for quick, tool-free installs

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 length is this cable?
A: 2.5 meters.

Q: Does it need optical modules?
A: No. It is a fully integrated passive DAC.

Q: Is it compatible with QSFP28 CR4?
A: No. It is intended for QSFP56 100GBASE-CR2 ports; QSFP28 CR4-only ports are not supported.

Q: What environments is it best suited for?
A: Short-reach data center links such as within or between adjacent racks.

Q: Does it add measurable latency?
A: Latency is negligible due to the passive copper design.

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: 2.5 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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