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1m (3ft) NVIDIA (InfiniBand) Compatible 400G QSFP-DD to 2 x 200G QSFP56 Passive Direct Attach Copper Breakout Cable
P/N: Q2Q56-400G-CU
US$139.00
10
Reviews
5
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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1m (3ft) NVIDIA (InfiniBand) Compatible 400G QSFP-DD to 2 x 200G QSFP56 Passive Direct Attach Copper Breakout Cable
The NVIDIA/Mellanox compatible 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. FS 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 (5) Management (1)Product (1)Compatibility (1)Installation (1)Performance (1)
Q:

Are these InfiniBand DAC/AOC cables compatible with NVIDIA/Mellanox ConnectX NICs?

by a***m on 2025-07-10 10:06:34

A:

Yes, our InfiniBand DAC and AOC cables are fully compatible with NVIDIA/Mellanox ConnectX-5, ConnectX-6, and ConnectX-7 NICs, as well as with NVIDIA Quantum and Spectrum switches.

by CPLIGHT on 2025-07-10 10:24:04

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Q:

Can these cables be used for GPU Direct RDMA communication?

by e***m on 2025-07-10 09:22:24

A:

Absolutely. These InfiniBand cables support GPU Direct RDMA, enabling low-latency, high-throughput data transfers directly between GPUs across the fabric.

by CPLIGHT on 2025-07-10 10:24:35

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Q:

Do InfiniBand AOC cables support long-distance connections?

by B***m on 2025-07-10 09:13:54

A:

Yes, AOC (Active Optical Cables) support longer distances than DACs, typically up to 30 meters or more, while maintaining low latency and high bandwidth transmission.

by Helpful on 2025-07-10 10:26:18

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Q:

What is the difference between HDR and NDR InfiniBand cables?

by j***m on 2025-07-10 09:03:58

A:

HDR (High Data Rate) supports up to 200Gb/s per port, while NDR (Next Data Rate) can handle 400Gb/s. Both are used for high-performance computing, but NDR is designed for newer-generation systems requiring ultra-high bandwidth.

by CPLIGHT on 2025-07-10 10:23:26

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Q:

Do these cables require special configuration after plugging in?

by q***m on 2025-07-10 08:53:31

A:

No special configuration is needed. The cables are hot-swappable and designed for plug-and-play operation in InfiniBand environments.

by Helpful on 2025-07-10 10:25:43

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Customer Reviews
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All (10) Performance (1)Compatibility (1)Ease of Use (1)Customer Support (1)Value (1)Reliability (1)Flexibility (1)Scalability (1)Quality (1)Delivery (1)
k
k***m
2025-06-18 18:15:16
Confirmed Purchase
5.0

Worked out of the box with ConnectX-6 NICs and Quantum switches. Auto-negotiation and link detection were flawless across all ports.

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4
4***m
2025-06-02 19:39:35
Confirmed Purchase
5.0

The connectors are solid, and the shielding is robust. No damage or signal degradation even after multiple insertions.

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J
J***m
2025-06-01 23:42:58
Confirmed Purchase
5.0

We had tight routing paths between racks and these DACs were flexible enough for clean cable management without strain.

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C
C***m
2025-05-30 20:17:44
Confirmed Purchase
5.0

Cables were clearly labeled and well packaged. Plug-and-play setup made our data center upgrade smooth and fast.

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E
E***m
2025-05-30 04:47:47
Confirmed Purchase
5.0

Compared to OEM versions, these cables offer the same performance at a significantly lower cost. Great for large-scale deployment.

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y
y***m
2025-05-03 05:49:39
Confirmed Purchase
5.0

Customer service helped confirm the pinout for a custom breakout setup. Very knowledgeable and responsive team.

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5
5***m
2025-04-23 07:06:15
Confirmed Purchase
5.0

We used these InfiniBand HDR DAC cables to link GPU servers in our HPC cluster. The latency and bandwidth were excellent — no packet loss even under full load.

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U
U***m
2025-04-14 10:36:05
Confirmed Purchase
5.0

We used breakout versions (1x400G to 4x100G) to expand our interconnect fabric and they worked flawlessly.

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6
6***m
2025-04-13 19:09:13
Confirmed Purchase
5.0

Order arrived earlier than expected. All cables were individually tested and labeled, saving us time during rack installation.

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h
h***m
2025-04-06 04:59:08
Confirmed Purchase
5.0

Running 24/7 in an AI training environment with zero errors so far. Excellent quality and heat management.

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