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2.5m(8ft) Arista CAB-D-2Q-400-2.5 Compatible 400G QSFP-DD to 2x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
2.5m(8ft) Arista CAB-D-2Q-400-2.5 Compatible 400G QSFP-DD to 2x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
2.5m(8ft) Arista CAB-D-2Q-400-2.5 Compatible 400G QSFP-DD to 2x 200G QSFP56 Ethernet Passive Direct Attach Copper Breakout Cable
P/N: Q400-2Q200-C2.5
US$138.00
2
Solds
3
Reviews
7
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
2.5m(8ft) Arista CAB-D-2Q-400-2.5 Compatible 400G QSFP-DD to 2x 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
CAB-D-2Q-400-2.5
Vendor Name
AICPLIGHT
Form Factor
QSFP-DD to 2x QSFP56
Max Data Rate
400Gbps
Media
Copper
Cable Type
Passive Twinax
Cable Length
2.5m(8ft)
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 (7) Application (1)Product (1)Compatibility (2)Installation (1)Performance (2)
Q:

Are these modules low power?

by 7***m on 2025-08-04 06:38:45

A:

Yes, we offer energy-efficient versions with low power consumption.

by AICPLIGHT on 2025-08-04 08:25:23

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comment icon Comment 0
Q:

What is the maximum distance supported?

by A***m on 2025-08-02 23:27:26

A:

Up to 10km depending on the model and fiber type.

by AICPLIGHT on 2025-08-03 08:04:50

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comment icon Comment 0
Q:

Is polarity important during installation?

by R***m on 2025-07-22 08:52:34

A:

Yes, ensure Type A/B polarity matches across the link.

by AICPLIGHT on 2025-07-22 12:37:00

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Q:

Does the product support hot-swappable installation?

by m***m on 2025-07-04 02:43:49

A:

Yes, all our transceivers are designed to be hot-swappable.

by AICPLIGHT on 2025-07-04 12:21:26

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Q:

Can this cable be used with OSFP/QSFP-DD ports?

by t***m on 2025-06-23 07:21:11

A:

Yes, we offer cables with a wide range of interface compatibility.

by AICPLIGHT on 2025-06-23 10:28:26

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Q:

Can these transceivers auto-negotiate with older models?

by n***m on 2025-06-18 14:53:35

A:

Yes, backward compatibility is supported in many cases.

by AICPLIGHT on 2025-06-18 16:08:12

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Customer Reviews
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All (3) Performance (1)Ease of Use (1)Value (1)
r
r***m
2025-08-04 13:26:08
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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P
P***m
2025-07-22 11:26:54
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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comment icon Comment 0
s
s***m
2025-05-02 05:48:00
Confirmed Purchase
5.0

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

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