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Cisco

Cisco QDD-400-CU2.5M | Optics: 400G | QSFP-DD | 400GBASE-CR8 | wavelength: N/A | reach: 2.5 m | connector: QSFP-DD to QSFP-DD | cable: passive DAC

SKU:QDD-400-CU2.5M

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Description

High-density 400G QSFP-DD direct attach copper cable for short, ultra-low-latency in-rack links. Delivers 400GBASE-CR8 performance over 2.5 m with simple plug-and-play deployment between 400G switches, routers, and NICs. Ideal for spine–leaf and top-of-rack interconnects where minimal power draw and lowest latency are required.

Features

- 400GBASE-CR8 compliance for robust 400G Ethernet links
- Ultra-low latency passive copper design
- Simple plug-and-play deployment
- High-density QSFP-DD form factor
- MSA and RoHS compliant construction

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 cable vendor-locked?
A: It is vendor-coded for compatibility with matching platforms. Verify your switch/NIC compatibility list before purchase.

Q: Can this cable break out to 8x50G or 4x100G?
A: No. This is a straight 400G-to-400G cable. Use a specific breakout DAC/AOC for breakout applications.

Q: What ports does it fit?
A: QSFP-DD 400G ports on switches, routers, and server NICs.

Q: Does it require separate power?
A: No. It is a passive DAC and draws negligible power from the host port.

Q: Can I interconnect QSFP-DD and OSFP with this cable?
A: No. Both ends must be QSFP-DD. Use form-factor-converted solutions if mixing modules.

Technical Specifications

- Data rate: 400 Gb/s (8 x 50G PAM4)
- Form factor: QSFP-DD to QSFP-DD
- Interface standard: 400GBASE-CR8
- Cable type: Passive copper DAC
- Length: 2.5 m
- Connectors: QSFP-DD male to QSFP-DD male
- Latency: Near-zero (passive copper)
- Operating temperature: 0 to 70 °C (commercial)
- Compliance: QSFP-DD MSA, RoHS
- Use case: In-rack/to adjacent rack short-reach 400G links

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