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1m (3ft) NVIDIA (InfiniBand) Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Active Optical Breakout Cable
P/N: Q2Q56-400G-A
US$1249.00
10
Reviews
5
Questions
safeguard
4-Year Warranty
30-Day Returns
30-Day Exchange
(1000 In Stock)

Product Highlights

Built-in Inphi Chip, COB Packaging
Low Power Consumption <4W (200G Per End), 8W (400G Per End)
Tested in Targeted Switches for Superior Performance, Quality, and Reliability
Increased Reliability-VCSEL, No MPO Connectors, Low BER
PAM4 Modulation, Supports 400G to 2x 200G Ethernet Interoperability
Thin and Light Weight Fiber with High Air Flow for Flexible Routing
OFNP-Rated, Hot Pluggable QSFP-DD and QSFP56 MSA Compliant
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1m (3ft) NVIDIA (InfiniBand) Compatible 400G QSFP-DD to 2 x 200G QSFP56 Ethernet Active Optical Breakout Cable
The 400G QSFP-DD to 2x 200G NVIDIA (InfiniBand) QSFP56 breakout active optical cables operate over multi-mode fibers (MMF). This breakout cable is compliant with IEEE 802.3, QSFP-DD MSA, SFF-8024, SFF-8679, SFF-8665, OIF-CEI-04.0, and CMIS 4.0. Thin and lightweight AOC cables simplify cable management, enabling an efficient system airflow, which is critical in high-density racks. It is used extensively in cloud and supercomputers due to its low cost, high-value proposition, and increased reliability.
Specifications
Part Number
Q2Q56-400G-A
Vendor Name
AICPLIGHT
Form Factor
QSFP-DD to 2x QSFP56
Max Data Rate
425Gbps(8x53.125Gb/s)
Media
Copper
Cable Type
OM3
Cable Length
1m (3ft)
Wire AWG
30AWG
Minimum Bend Radius
30mm
Transmitter Type
VSCEL
Receiver Type
PIN
Wavelength
850nm
Power Consumption
≤8W
Jacket Material
PVC (OFNR)
CDR (Clock and Data Recovery)
TX & RX Built-in CDR
Modulation Format
8x 50G-PAM4 to Dual 4x 50G-PAM4
Temperature
0 to 70°C (32 to 158°F)
DDM/DOM
Supported
FEC Function
RS-FEC
Protocols
IEEE 802.3cd, IEEE 802.3bs, QSFP-DD MSA, SFF-8024, SFF-8679, SFF-8665, CMIS 4.0, OIF-CEI-04.0
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:

Do InfiniBand AOC cables support long-distance connections?

by D***m on 2025-07-10 10:16:57

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 CPLIGHT on 2025-07-10 10:26:18

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Q:

Can these cables be used for GPU Direct RDMA communication?

by R***m on 2025-07-10 10:03:48

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:

What is the difference between HDR and NDR InfiniBand cables?

by m***m on 2025-07-10 09:52:47

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 Helpful on 2025-07-10 10:23:26

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Q:

Do these cables require special configuration after plugging in?

by B***m on 2025-07-10 09:51:06

A:

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

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

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Q:

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

by j***m on 2025-07-10 08:44:10

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 Helpful on 2025-07-10 10:24:04

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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
2025-07-04 05:51:00
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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8
8***m
2025-06-23 03:06:23
Confirmed Purchase
5.0

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

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u
u***m
2025-06-17 02:10:45
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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F
F***m
2025-06-16 12:36:07
Confirmed Purchase
5.0

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

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p
p***m
2025-06-11 03:04:11
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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G
G***m
2025-06-09 10:45:21
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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Z
Z***m
2025-06-07 19:10:01
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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5
5***m
2025-05-08 23:10:25
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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p
p***m
2025-05-06 08:07:15
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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Z
Z***m
2025-05-03 23:54:17
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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