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Cisco

Cisco QDD-400-CU0.5M | 400G | QSFP-DD | 400GBASE-CR8 Passive DAC | 0.5 m | QSFP-DD to QSFP-DD | Copper Twinax

SKU:QDD-400-CU0.5M

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Description

Ultra-short reach 400G passive copper twinax DAC for top-of-rack and adjacent rack interconnects where the lowest latency and power are critical. Optimized for 400GBASE-CR8 links on QSFP-DD ports in high-density data centers.

Features

- Lowest latency 400G interconnect with passive copper
- Power-free operation for maximum energy efficiency
- Rugged twinax construction for reliable short links
- QSFP-DD MSA-compliant, plug-and-play
- Optimal for dense TOR and leaf-spine fabrics

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 is the typical use case for a 0.5 m 400G DAC?
A: Ultra-short intra-rack connections between adjacent ports or same-chassis modules where minimal slack is desired.

Q: Does this cable require any power?
A: No. It is a passive copper DAC and draws negligible power from the host interface.

Q: Is it compatible with all QSFP-DD 400G ports?
A: It is intended for ports supporting 400GBASE-CR8 passive copper DACs. Check your platform’s compatibility list.

Q: Can this DAC be used for breakout?
A: No. It is a straight QSFP-DD to QSFP-DD 400G link, not a breakout cable.

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: 0.5 meters
- 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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