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Cisco

Cisco QDD-400-CU1M | 400G | QSFP-DD | 400GBASE-CR8 Passive DAC | 1 m | QSFP-DD to QSFP-DD | Copper Twinax

SKU:QDD-400-CU1M

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Description

Short-reach 400G passive copper twinax DAC providing the lowest latency and power for intra-rack and adjacent rack connectivity. Engineered for 400GBASE-CR8 QSFP-DD ports in high-density data center fabrics.

Features

- Ultra-low latency 400G copper interconnect
- No active components—zero additional power draw
- Robust twinax construction for reliable short links
- Hot-swappable QSFP-DD MSA compliance
- Ideal for dense racks and short TOR connections

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: When should I choose a 1 m DAC over longer optical options?
A: Use passive DACs for the shortest links where minimal latency, zero power draw, and lower cost are preferred.

Q: Is this DAC suitable for 400G ports that support CR8?
A: Yes. It is designed for QSFP-DD ports that implement the 400GBASE-CR8 specification.

Q: Does the cable support breakout operation?
A: No. This is a straight 400G QSFP-DD to QSFP-DD link and not a breakout cable.

Q: Is any configuration required on the switch?
A: Typically no; it is plug-and-play on compatible platforms. Ensure the port is set for 400G CR8 mode if configurable.

Technical Specifications

- Data rate: 400 Gbps (8x50G PAM4)
- Standard: 400GBASE-CR8
- Form factor: QSFP-DD
- Type: Passive Direct Attach Copper (DAC)
- Cable medium: Copper twinax
- Length: 1 meter
- Interface: QSFP-DD to QSFP-DD
- Latency: Near-zero (passive copper)
- Power consumption: Negligible (no active components)
- Compliance: QSFP-DD MSA, IEEE 802.3 400G (CR8)
- Applications: Intra-rack, adjacent rack, TOR/leaf-spine
- Hot-swappable: Yes

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