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0.5m (2ft) Cisco Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
0.5m (2ft) Cisco Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
0.5m (2ft) Cisco Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
P/N: OSFP-QDD-CU
US$124.00
5
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
Hot Pluggable OSFP MSA and QSFP-DD MSA Compliant
Minimum Bend Radius 34.5mm for Flexible Routing
4x 100G PAM4 400GAUI-4 Electrical Interface
Low Insertion Loss and Ultra-low Crosstalk for Improved Performance
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Specifications
Q&A
Reviews
Resources
0.5m (2ft) Cisco Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
The 400G OSFP to 400G QSFP-DD DAC provides a 400G copper direct-attach solution with a Flat-top (OSFP-RHS) form factor, suitable for very short links and offer a cost-effective way to establish a 400-Gigabit link between 400G ports of switches/routers within racks and across adjacent racks. This DAC is designed with ultra-low loss materials, square rings, twisted pair cable 8 wires and shell extension construction for superior mechanical properties and bending performance. It is tested in actual switching systems to ensure optimal signal integrity and the best end-to-end performance, ideal for SDN, ML, and Cloud Computing.
Note: This 400G QSFP-DD end operates on 4x100G-PAM4 modulation, making it suitable for downspeeding on 800G QSFP-DD switches that support channel disabling (i.e., operating with only 4 lanes enabled). It is not compatible with 400G QSFP-DD switches that use 8x50G-PAM4 modulation.
Specifications
Part Number
OSFP-QDD-CU
Vendor Name
AICPLIGHT
Form Factor
OSFP (Flat Top) to QSFP-DD
Max Data Rate
400Gbps
Media
Copper
Cable Type
Passive Twinax
Cable Length
0.5m (2ft)
Wire AWG
30AWG
Minimum Bend Radius
34.5mm
Power Consumption
≤0.1W
Jacket Material
PVC (OFNR)
Temperature
0 to 70°C (32 to 158°F)
Modulation Technology
OSFP-4x100GPAM4; QDD-4x100GPAM4
Application
400G Ethernet
Protocols
IEEE 802.3cd, OSFP MSA, QSFP-DD MSA, CMIS Rev4.0, SFF-8417
Warranty
5 Years
Certification
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Questions & Answers
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All (5) Application (1)Product (1)Compatibility (1)Installation (1)Performance (1)
Q:

What is the maximum distance supported?

by O***m on 2025-07-10 09:58:07

A:

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

by CPLIGHT on 2025-07-10 10:19:14

like icon Helpful 0
comment icon Comment 0
Q:

Is this product designed for enterprise LANs?

by L***m on 2025-07-10 09:43:36

A:

Yes, lower speed modules are ideal for LAN and campus networks.

by Helpful on 2025-07-10 10:18:31

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comment icon Comment 0
Q:

Do I need to configure anything before installation?

by Q***m on 2025-07-10 09:26:09

A:

No major configuration is required; most modules are plug-and-play.

by CPLIGHT on 2025-07-10 10:18:08

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Q:

How do I verify the module is working?

by p***m on 2025-07-10 09:03:04

A:

Use switch CLI or monitoring tools to check link status.

by Helpful on 2025-07-10 10:18:53

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Q:

Does the product support hot-swappable installation?

by e***m on 2025-07-10 09:03:03

A:

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

by CPLIGHT on 2025-07-10 10:17:42

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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)
w
w***m
2025-06-12 03:05:16
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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comment icon Comment 0
v
v***m
2025-05-31 22:22:05
Confirmed Purchase
5.0

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

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m
m***m
2025-05-19 20:13:33
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
2025-04-22 19:48:47
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
i
i***m
2025-04-03 21:40:56
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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