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1m (3ft) NVIDIA/Mellanox Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
1m (3ft) NVIDIA/Mellanox Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
1m (3ft) NVIDIA/Mellanox Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
P/N: Q2Q56-400G-CU
US$139.00
5
Reviews
2
Questions
safeguard
4-Year Warranty
30-Day Returns
30-Day Exchange
（1000 In Stock）

Product Highlights

Max. Power Consumption 0.1W Per End, and Has Near Zero-latency Delays
Tested in Targeted Switches for Superior Performance, Quality, and Reliability
Simplifies Patching and Offers a Cost-effective Way for Short Links
Supports 400G to 2x 200G Ethernet Interoperability
Hot Pluggable QSFP-DD and QSFP56 MSA Compliant
Minimum Bend Radius 33.5mm for Flexible Routing
8x50G PAM4 Retimed 400GAUI-8 Electrical Interface
Low Insertion Loss and Ultra-low Crosstalk for Improved Performance
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Specifications
Q&A
Reviews
Resources
1m (3ft) NVIDIA/Mellanox Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
The 400G QSFP-DD to 2x 200G QSFP56 cable assembly is designed to meet the high density requirements of standard and combo connector configurations. QSFP-DD pluggable solutions enable 400G transmission. It is fully compliant with SFF-8679, QSFP-DD MSA, IEEE802.3bj, and IEEE802.3cd standards. QSFP-DD to 2x QSFP56 cable assemblies are high performance, high bandwidth and cost effective interconnect solutions that support 400G standard applications with different data rates. AICPLIGHT currently offers 400G QSFP-DD to 2x 200G QSFP56 DAC in lengths of 0.5, 1, 1.5, 2, 2.5, and 3 meters, ideal for SDN, ML, and Cloud Computing.
Specifications
Part Number
Q2Q56-400G-CU
Vendor Name
AICPLIGHT
Form Factor
QSFP-DD to 2x QSFP56
Max Data Rate
400Gbps
Media
Copper
Cable Type
Passive Twinax
Cable Length
1m (3ft)
Wire AWG
30AWG
Minimum Bend Radius
33.5mm
Power Consumption
≤0.1W
Jacket Material
PVC (OFNR)
Temperature
0 to 70°C (32 to 158°F)
Modulation Technology
PAM4
Application
400G Ethernet
Protocols
IEEE802.3Bj, By, IEEE802.3CD, SFF-8679, SFF-8636
Warranty
5 Years
Certification
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Questions & Answers
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All (2) Compatibility (1)Installation (1)
Q:

How should cables be routed in a high-density rack?

by G***m on 2025-07-10 16:13:01

A:

Use cable managers to maintain airflow and prevent bending.

by CPLIGHT on 2025-07-10 16:41:46

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comment icon Comment 0
Q:

Can these transceivers auto-negotiate with older models?

by U***m on 2025-07-10 15:20:56

A:

Yes, backward compatibility is supported in many cases.

by Helpful on 2025-07-10 16:40:25

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Customer Reviews
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All (5) Performance (1)Compatibility (1)Ease of Use (1)Customer Support (1)Value (1)
p
p***m
2025-06-16 13:33:32
Confirmed Purchase
5.0

High-quality interconnects at a fraction of the price of branded cables. Ideal for scaling AI clusters on a budget.

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A
A***m
2025-06-05 15:44:57
Confirmed Purchase
5.0

We had a shipping delay and the support team took ownership and resolved it quickly with a courier reroute.

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J
J***m
2025-05-08 01:36:55
Confirmed Purchase
5.0

Used in our GPU training pod (8x H100s) to connect each server node. Latency remained sub-microsecond, even with large tensor workloads.

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w
w***m
2025-04-12 11:27:35
Confirmed Purchase
5.0

Fully compatible with our NVIDIA ConnectX-6 NICs and Mellanox switches. No firmware warnings or handshake delays.

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3
3***m
2025-04-04 15:44:07
Confirmed Purchase
5.0

Plug-and-play experience was excellent. The cables came clean and ready for immediate deployment.

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