Cisco QSFP‑400G‑CU5M Full English Product Description

Cisco QSFP‑400G‑CU5M is an original Cisco QSFP‑DD‑to‑QSFP‑DD 400GBASE‑CR8 Passive Direct‑Attach Copper Cable with a fixed length of 5 meters. This fully‑integrated pre‑terminated twinax copper assembly adopts passive circuit design without built‑in signal conditioning chips. Compliant with QSFP‑DD MSA and IEEE 802.3ck standards, it delivers cost‑effective, low‑latency 400‑Gigabit point‑to‑point interconnection solutions for medium‑range intra‑rack and cross‑rack links in enterprise, cloud, AI computing and high‑performance computing data centers.

400 Gbps Full‑Duplex Electrical Transmission

Supports 400GBASE‑CR8 Ethernet over eight independent 50 Gbps PAM‑4 differential signal lanes, delivering stable bidirectional 400 Gbps throughput for leaf‑spine network fabrics, switch‑to‑switch, switch‑to‑server and high‑speed AI storage networking infrastructure.
Passive Zero‑Power Copper Architecture

No internal power‑consuming signal amplification chips. Zero power consumption during operation, helping reduce overall data‑center power budget and thermal load. Reliable signal integrity is guaranteed for medium‑reach 400G high‑speed transmission.
Ultra‑Low‑Latency Copper Transmission

Copper direct‑attach transmission maintains minimal latency compared with active optical cables, perfectly suited for low‑latency AI clusters, virtualization platforms and high‑frequency trading network environments.
Hot‑Swappable QSFP‑DD Interface

Standard hot‑pluggable QSFP‑DD form factor allows technicians to install or remove the cable without powering down connected switches, routers and servers. Backward compatible with part of QSFP56 ports under specified configurations.
Multi‑Layer Shielded Twinax Construction

24 AWG multi‑layer shielded twinax copper cable effectively suppresses EMI and RFI electromagnetic interference, lowering crosstalk risk under high‑density rack deployment conditions.
Standard Pull‑Tab Latch Design

Equipped with pull‑tab latches for convenient insertion and extraction from QSFP‑DD ports on network hardware.

Technical Specifications

Part Number: QSFP‑400G‑CU5M
Cable Length: 5 m (16.40 ft)
Cable Type: Passive Shielded Twinax Copper Assembly
Interface: QSFP‑DD to QSFP‑DD
Data Rate: 400 Gbps (8 × 50 Gbps full‑duplex PAM‑4)
Standards Compliance: QSFP‑DD MSA, IEEE 802.3ck 400GBASE‑CR8
Typical Power Consumption: 0 W (Passive)
Commercial Operating Temperature: 0°C ~ 70°C
Storage Temperature: ‑40°C ~ 85°C
Outer Jacket: Black PVC
Environmental Compliance: RoHS‑6 Lead‑Free

Cisco switches and routers equipped with QSFP‑DD 400G ports, including high‑density data‑center switches, AI leaf‑spine switches, aggregation routers, and other third‑party network devices complying with QSFP‑DD MSA specifications supporting 400G passive direct‑attach copper cables.

Application Scenarios

Designed for medium‑distance intra‑rack and cross‑rack interconnections in cloud data centers, enterprise data centers, AI computing and HPC environments. Typical applications include leaf‑spine switch interconnections, 400G switch‑to‑server links, and medium‑reach Storage Area Network (SAN) connections, where zero‑power, low‑latency and cost‑effective copper interconnection is preferred.

Short Version (For Invoice / E‑commerce Listing)

Cisco QSFP‑400G‑CU5M, 5M 400GBASE‑CR8 QSFP‑DD Passive Direct‑Attach Twinax Copper Cable, 400Gbps full‑duplex transmission, zero power consumption, ultra‑low latency, MSA compliant, original Cisco passive DAC cable for medium‑range 400 Gigabit data‑center interconnections.

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Cisco QSFP‑400G‑CU5M Full English Product Description

Product Overview

Key Features

Technical Specifications

Compatible Hardware

Application Scenarios

Short Version (For Invoice / E‑commerce Listing)


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