logo
Solutions
GPU Repair
GPU Cloud Rental
Resources
About Us
Contact Us
FREE SHIPPING on Orders Over US$99
Free Quotation

English English

By clicking the "Submit", you agree that your information is collected and used for the purpose of responding to your inquiry in accordance with the Privacy Policy and Terms of Use
Submit
2m(7ft) HPE Aruba Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
2m(7ft) HPE Aruba Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
2m(7ft) HPE Aruba Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable
P/N: O400-QDD-C2
$159.00
3
Solds
5
Reviews
10
Questions
safeguard
4-Year Warranty
30-Day Returns
30-Day Exchange
（1 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
See more
Specifications
Certification
Connectivity Solutions
Comparison Table
Q&A
Reviews
Resources
2m(7ft) HPE Aruba 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
Connector Type
OSFP(Flat Top) to QSFP-DD
Data Rate
425Gbps to 425Gbps
Media
Copper
Cable Type
DAC
Cable Length
0.5m~2.5m(2ft~8ft)
Outer Diameter
0.5m~1m@AWG 30 1.5m~3m@AWG 28
Jacket Material
PVC
Minimum Bend Radius
23mm@AWG 30 25mm@AWG 28
Power Consumption
≤0.1W
Case Operating Temperature
0 to 70°C (32 to 158°F)
Protocol
400 Gigabit Ethernet 400G RoCE
Application
Swicth to Switch Switch to NIC Other Links
Certification
Product
Product
Product
Product
Product
Product
Product
Product
Product
Product
Connectivity Solutions
HPE Aruba Switch links：400G QSFP-DD to 400G OSFP
All
HPE Aruba Switch links：400G QSFP-DD to 400G OSFP
Comparison Table
Cisco Compatible 400G QSFP-DD Passive DAC, 1m(3ft)
QDD-QDD-C1
Cisco Compatible 400G QSFP-DD to 2x 200G QSFP56 Passive Breakout DAC, 1m(3ft)
Q400-2Q200-C1
Cisco Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive DAC, 1m(3ft)
O400-QDD-C1
Cisco Compatible 400G OSFP Finned Top to 2 x 200G QSFP56 Breakout DAC, 1m(3ft)
O400-2Q200-C1
Connector Type QSFP-DD to QSFP-DDQSFP-DD to 2x QSFP56OSFP(Flat Top) to QSFP-DDOSFP(Finned Top) to 2x QSFP56
Data Rate 425Gbps to 425Gbps425Gbps to 2x 212.5Gbps425Gbps to 425Gbps425Gbps to 2x 212.5Gbps
Media CopperCopperCopperCopper
Cable Type DACDACDACDAC
Cable Length 0.5m~3m(2ft~10ft)1m~3m(3ft~10ft)0.5m~2.5m(2ft~8ft)1m~2m(3ft~7ft)
Outer Diameter 0.5m~1.5m@AWG 30 2~3m@AWG 281m@AWG 30 1.5~3m@AWG 280.5m~1m@AWG 30 1.5m~3m@AWG 281m@AWG 30 1.5m~2m@AWG 28
Jacket Material PVCPVCPVCPVC
Minimum Bend Radius 23mm@AWG 30 25mm@AWG 2823mm@AWG 30 25mm@AWG 2823mm@AWG 30 25mm@AWG 2823mm@AWG 30 25mm@AWG 28
Power Consumption ≤0.1W≤0.1W≤0.1W≤0.1W
Case Operating Temperature 0 to 70°C (32 to 158°F)0 to 70°C (32 to 158°F)0 to 70°C (32 to 158°F)0 to 70°C (32 to 158°F)
Protocol 400 Gigabit Ethernet 400G RoCE2x 200G Breakout Ethernet 2x 200G RoCE400 Gigabit Ethernet 400G RoCE2x 200G Breakout Ethernet 2x 200G RoCE 2x 200G Breakout Infiniband HDR
Application Swicth to Switch Switch to NIC Other LinksSwicth to Switch Switch to NIC Other LinksSwicth to Switch Switch to NIC Other LinksSwicth to Switch Switch to NIC Other Links
Connector Type
Data Rate
Media
Cable Type
Cable Length
Outer Diameter
Jacket Material
Minimum Bend Radius
Power Consumption
Case Operating Temperature
Protocol
Application
Cisco Compatible 400G QSFP-DD Passive DAC, 1m(3ft)
QDD-QDD-C1
Cisco Compatible 400G QSFP-DD to 2x 200G QSFP56 Passive Breakout DAC, 1m(3ft)
Q400-2Q200-C1
Cisco Compatible 400G OSFP Flat Top to 400G QSFP-DD Passive DAC, 1m(3ft)
O400-QDD-C1
Cisco Compatible 400G OSFP Finned Top to 2 x 200G QSFP56 Breakout DAC, 1m(3ft)
O400-2Q200-C1
QSFP-DD to QSFP-DD
QSFP-DD to 2x QSFP56
OSFP(Flat Top) to QSFP-DD
OSFP(Finned Top) to 2x QSFP56
425Gbps to 425Gbps
425Gbps to 2x 212.5Gbps
425Gbps to 425Gbps
425Gbps to 2x 212.5Gbps
Copper
Copper
Copper
Copper
DAC
DAC
DAC
DAC
0.5m~3m(2ft~10ft)
1m~3m(3ft~10ft)
0.5m~2.5m(2ft~8ft)
1m~2m(3ft~7ft)
0.5m~1.5m@AWG 30 2~3m@AWG 28
1m@AWG 30 1.5~3m@AWG 28
0.5m~1m@AWG 30 1.5m~3m@AWG 28
1m@AWG 30 1.5m~2m@AWG 28
PVC
PVC
PVC
PVC
23mm@AWG 30 25mm@AWG 28
23mm@AWG 30 25mm@AWG 28
23mm@AWG 30 25mm@AWG 28
23mm@AWG 30 25mm@AWG 28
≤0.1W
≤0.1W
≤0.1W
≤0.1W
0 to 70°C (32 to 158°F)
0 to 70°C (32 to 158°F)
0 to 70°C (32 to 158°F)
0 to 70°C (32 to 158°F)
400 Gigabit Ethernet 400G RoCE
2x 200G Breakout Ethernet 2x 200G RoCE
400 Gigabit Ethernet 400G RoCE
2x 200G Breakout Ethernet 2x 200G RoCE 2x 200G Breakout Infiniband HDR
Swicth to Switch Switch to NIC Other Links
Swicth to Switch Switch to NIC Other Links
Swicth to Switch Switch to NIC Other Links
Swicth to Switch Switch to NIC Other Links
Questions & Answers
edit icon Ask a question
All (10) Application (2)Product (2)Compatibility (2)Installation (2)Performance (2)
Q:

What’s the typical BER (Bit Error Rate)?

by W***m on 2025-09-17 10:52:00

A:

Typical BER is under normal operation.

by AICPLIGHT on 2025-09-17 23:58:38

like icon Helpful 0
comment icon Comment 0
Q:

Are these transceivers used in cloud computing?

by V***m on 2025-08-26 21:44:18

A:

Yes, they are widely used in public and private cloud infrastructure.

by AICPLIGHT on 2025-08-27 04:09:35

like icon Helpful 0
comment icon Comment 0
Q:

Is polarity important during installation?

by 3***m on 2025-06-23 14:06:48

A:

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

by AICPLIGHT on 2025-06-24 13:25:35

like icon Helpful 0
comment icon Comment 0
Q:

What is the operating temperature range?

by u***m on 2025-06-20 10:29:07

A:

Most modules operate between 0°C to 70°C, with extended versions available.

by AICPLIGHT on 2025-06-20 23:12:26

like icon Helpful 0
comment icon Comment 0
Q:

What cable types are supported?

by d***m on 2025-05-29 05:43:42

A:

Supported cables include OS2, OM3, OM4, and OM5.

by AICPLIGHT on 2025-05-30 02:11:46

like icon Helpful 0
comment icon Comment 0
Q:

Is it compatible with breakout configurations?

by G***m on 2025-04-02 14:13:20

A:

Yes, we support various breakout and parallel transmission structures.

by AICPLIGHT on 2025-04-02 20:55:04

like icon Helpful 0
comment icon Comment 0
Customer Reviews
edit icon Write a review
All (5) Performance (1)Compatibility (1)Ease of Use (1)Customer Support (1)Value (1)
L
L***m
2025-06-25 14:43:17
Confirmed Purchase
5.0

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

link icon Helpful 0
comment icon Comment 0
F
F***m
2025-05-23 14:50:34
Confirmed Purchase
5.0

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

link icon Helpful 0
comment icon Comment 0
Q
Q***m
2025-05-05 03:49:39
Confirmed Purchase
5.0

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

link icon Helpful 0
comment icon Comment 0
g
g***m
2025-04-18 21:07:18
Confirmed Purchase
5.0

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

link icon Helpful 0
comment icon Comment 0
R
R***m
2025-04-18 06:05:04
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.

link icon Helpful 0
comment icon Comment 0
contact us