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2m(7ft) NVIDIA/Mellanox MCP1660-W002E26 Compatible 400G QSFP-DD Ethernet Passive Direct Attach Copper Twinax Cable
2m(7ft) NVIDIA/Mellanox MCP1660-W002E26 Compatible 400G QSFP-DD Ethernet Passive Direct Attach Copper Twinax Cable
2m(7ft) NVIDIA/Mellanox MCP1660-W002E26 Compatible 400G QSFP-DD Ethernet Passive Direct Attach Copper Twinax Cable
P/N: QDD-QDD-C2
$159.00
7
Solds
5
Reviews
5
Questions
safeguard
4-Year Warranty
30-Day Returns
30-Day Exchange
（1 In Stock）

Product Highlights

Near-Zero Power, Low Latency and Insertion Loss
Tested in Targeted Switches for Superior Performance, Quality, and Reliability
Highly Reliable with No Electronics or Optical Connectors
Designed to Beyond IEEE Industry BER Standards for Reliable Operation Under Harsh Operating Conditions
Simplifies Patching and Offers a Cost-effective Way for Short Links
Compliant to QSFP-DD MSA, CMIS Rev4.0, OIF 56G PAM4
Minimum Bend Radius 33.5mm for Flexible Routing
8x50G PAM4 400GAUI-8 Electrical Interface
See more
Specifications
Certification
Connectivity Solutions
Comparison Table
Q&A
Reviews
Resources
2m(7ft) NVIDIA/Mellanox MCP1660-W002E26 Compatible 400G QSFP-DD Ethernet Passive Direct Attach Copper Twinax Cable
The 400G QSFP-DD DAC provides a QSFP-DD-to-QSFP-DD copper direct-attach solution and it is suitable for very short links and offer a cost-effective way to establish a 400-Gigabit link between QSFP-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. AICPLIGHT currently offers 400G QSFP-DD DAC in lengths of 0.5, 1, 1.5, 2, 2.5, and 3 meters, ideal for SDN, ML, and Cloud Computing.
Specifications
Connector Type
QSFP-DD to QSFP-DD
Data Rate
425Gbps to 425Gbps
Media
Copper
Cable Type
DAC
Cable Length
0.5m~3m(2ft~10ft)
Outer Diameter
0.5m~1.5m@AWG 30 2~3m@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
Mellanox Switch links：400G QSFP-DD to 400G QSFP-DD
All
Mellanox Switch links：400G QSFP-DD to 400G QSFP-DD
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 (5) Application (1)Product (1)Compatibility (1)Installation (1)Performance (1)
Q:

What is the typical MTBF of these products?

by B***m on 2025-09-24 02:38:22

A:

The typical MTBF (Mean Time Between Failures) exceeds 1 million hours.

by AICPLIGHT on 2025-09-24 08:05:15

like icon Helpful 0
comment icon Comment 0
Q:

What cable types are supported?

by 5***m on 2025-06-20 02:33:28

A:

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

by AICPLIGHT on 2025-06-20 12:40:12

like icon Helpful 0
comment icon Comment 0
Q:

How do I clean MTP connectors before use?

by L***m on 2025-02-22 03:01:41

A:

Use an MTP/MPO one-click cleaner or lint-free wipes with alcohol.

by AICPLIGHT on 2025-02-23 00:46:03

like icon Helpful 0
comment icon Comment 0
Q:

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

by O***m on 2025-01-29 21:39:35

A:

Typical BER is under normal operation.

by AICPLIGHT on 2025-01-30 09:21:53

like icon Helpful 0
comment icon Comment 0
Q:

Are these transceivers used in cloud computing?

by x***m on 2025-01-27 14:41:05

A:

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

by AICPLIGHT on 2025-01-27 19:22:37

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)
9
9***m
2025-07-01 21:26:06
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
8
8***m
2025-06-28 11:53:56
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
D
D***m
2025-05-15 09:30:29
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
8
8***m
2025-05-07 01:05:10
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
C
C***m
2025-04-05 00:27:10
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
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